@r35007/mock-server

v19.1.0

Published

8 months ago

Customize Your Own Local Mock Server

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r35007

JSON REST API prototyping mock mocking test testing rest data dummy sandbox server fake response db local

Mock Server

Getting started

Install Mock Server

npm install -g @r35007/mock-server

Run init command to create sample server files.

mock-server --init

Start Mock Server

mock-server

Now if we go to http://localhost:3000/posts, we'll get

[{ "id": 1, "title": "mock-server", "author": "r35007" }]

Routes

Based on the example db.json, you'll get the following routes:

GET    /posts
GET    /posts/:id
POST   /posts
PUT    /posts/:id
PATCH  /posts/:id
DELETE /posts/:id

# Same for comments

GET   /profile
PUT   /profile
PATCH /profile

Params

Conditions

→ ==
_lt → <
_lte → <=
_gt → >
_gte → >=
_ne → !=
_like → regex match

GET /posts?views_gt=9000

Range

_first
_last
_start
_end
_limit

GET /posts?_start=10&_end=20
GET /posts?_start=10&_limit=10

Paginate

_page
_per_page (default = 10)

GET /posts?_page=1&_per_page=25

Sort

_sort

GET /posts?_sort=id,-views

Text Search

_text
q

GET /posts?_text=qui%20est%20esse
GET /posts?q=qui%20est%20esse

Nested and array fields

x.y.z...
x.y.z[i]...

GET /foo?a.b=bar
GET /foo?x.y_lt=100
GET /foo?arr[0]=bar

Group By

_group

GET /posts?_group=userId&_limit=1
GET /posts?_group=userId&userId=1,2&_limit=2

Delete

DELETE /posts/1

Serving static files

If you create a ./public directory, Mock Server will serve its content in addition to the REST API.

You can also add custom directories using -s/--static option.

mock-server -s ./static

CLI Usage

$ mock-server --help
mock-server [options] <source>

Options:
  -c, --config              Path to config file                   [string]   [default: "mock-server.json"]
  -P, --port                Set port                              [number]   [default: 3000]
  -H, --host                Set host                              [string]   [default: "localhost"]
  -r, --root                Set root directory.                   [string]   [default: "./"]
  -s, --static              Set static files directory            [string]   [default: "./public"]
  -b, --base                Set base route path                   [string]   [default: ""]
      --db                  Path to database file                 [string]
      --middlewares, --md   Path to middlewares file              [string]
      --injectors, --in     Path to Injectors file                [string]
      --store, --st         Path to Store file                    [string]
      --rewriters, --rw     Path to Rewriter file                 [string]
      --id                  Set database id property              [string]   [default: "id"]
      --init                Create a sample server files          [boolean]  [default: false]
      --dbMode, --dm        Set Db mode                           [string]   [default: "mock"] [choices: "mock", "dev", "multi"]
      --snapshots, --ss     Set snapshots directory               [string]   [default: "./"]
      --reverse, --rv       Generate Route in revere order        [boolean]  [default: false]
      --readOnly, --ro      Allow only GET requests               [boolean]  [default: false]
      --noCors, --nc        Disable Cross-Origin Resource Sharing [boolean]  [default: false]
      --noGzip, --ng        Disable GZIP Content-Encoding         [boolean]  [default: false]
      --noCache, --nch      Disable Caching                       [boolean]  [default: true]
      --bodyParser, --bp    Enable body-parser                    [boolean]  [default: true]
      --cookieParser, --cp  Enable cookie-parser                  [boolean]  [default: true]
  -l, --logger              Enable logger                         [boolean]  [default: true]
      --log                 Enable Setter Logs                    [boolean]  [default: false]
  -w, --watch               Watch for changes                     [boolean]  [default: false]
  -q, --quiet               Prevent console logs                  [boolean]  [default: false]
  -h, --help                Show help                             [boolean]
  -v, --version             Show version number                   [boolean]

Examples:
  mock-server --init
  mock-server db.json
  mock-server --watch db.json
  mock-server http://jsonplaceholder.typicode.com/db

https://r35007.github.io/Mock-Server/

Using JS Module

Create server/index.js File

const { MockServer } = require('@r35007/mock-server');
const mockServer = MockServer.Create({ root: __dirname });
mockServer.launchServer('./db.json');

const { MockServer, watcher, chalk } = require('@r35007/mock-server');
const config = require('../.mockserverrc.js');

// Create Mock Server instance with custom config.
const mockServer = MockServer.Create(config);

const startServer = async () => {
  const app = mockServer.app;

  // Set global middlewares, injectors and store to mock server instance
  mockServer.setData({
    injectors: config.injectors,
    middlewares: config.middlewares,
    store: config.store,
  });

  // Make sure to use this at first, before all the resources
  const rewriter = mockServer.rewriter(config.rewriters);
  app.use(rewriter);

  // Add default Middlewares.
  const defaultsMiddlewares = mockServer.defaults();
  app.use(defaultsMiddlewares);

  // Add Database
  const resources = mockServer.resources(config.db);
  app.use(resources.router);

  // Create the Mock Server Home Page
  const homePage = mockServer.homePage();
  app.use(homePage);

  app.use(mockServer.pageNotFound); // Middleware to return `Page Not Found` as response if the route doesn't match
  app.use(mockServer.errorHandler); // Error Handler

  // Start server
  await mockServer.startServer();
};

startServer().then(() => {
  // watch for changes
  const watch = watcher.watch(mockServer.config.root);

  // Restart server on change
  watch.on('change', async () => {
    process.stdout.write(chalk.yellowBright(changedPath) + chalk.gray(' has changed, reloading...\n'));
    if (!mockServer.server) return; // return if no server to stop
    await MockServer.Destroy(mockServer).then(() => startServer()); // Stop and restart the server on changes
  });
});

Now go to terminal and type the following command to start the Mock Server.

node server

For more api reference please click here,

Database

We can add the database in three ways. Using setData, setDb or resources. The easy and efficient way to add the database is using resources.

Create db.json or db.jsonc or db.json5

{
  "posts": [{ "id": 1, "title": "mock-server", "author": "r35007" }],
  "comments": [{ "id": 1, "body": "some comment", "postId": 1 }],
  "profile": { "name": "r35007" }
}

Now in server.js

const { MockServer } = require('@r35007/mock-server');

const mockServer = MockServer.Create({ root: __dirname }); // Create Mock Server instance with custom config.

const app = mockServer.app;

// Adds Database and returns a new express router
const resources = mockServer.resources('./db.json');
app.use(resources.router);

// Add new database. This will be added to the existing database and will not override the existing route if exist
const newDb = {
  users: [
    { id: 1, name: 'foo' },
    { id: 2, name: 'bar' },
  ],
  profile: { name: 'foo' }, // will not be added since its already exist in resource
};
const newResource = mockServer.resources(newDb);
app.use(resources.router);

mockServer.startServer();

Database with Custom Options

We can create database with custom injectors, middlewares, dbMode etc..

For Example: server.js

const { MockServer } = require('@r35007/mock-server');

const mockServer = MockServer.Create({ root: __dirname }); // Create Mock Server instance with custom config.

const app = mockServer.app;

// Created new database with custom injectors and middlewares.
// These injectors and middlewares will not added to the global instance of the Mock Server
// Which means that these injectors and middleware will only be applied to todos database
const todos = {
  todos: [
    { id: 1, title: 'Todo 1', completed: false },
    { id: 2, title: 'Todo 2', completed: false },
  ],
};

const injectors = [{ routes: '/(.*)', delay: 1000, middlewares: ['log'] }];

const middlewares = {
  log: (req, res) => {
    console.log(req.url);
    res.send(res.locals.data);
  },
};
const todosResource = mockServer.resources(todos, {
  injectors,
  middlewares,
});
app.use(todosResource.router);

mockServer.startServer();

Please check resources api for more custom option reference.

Database with Create method

We can create database using create method by resources.

For Example: server.js

const { MockServer } = require("@r35007/mock-server");
const mockServer = MockServer.Create({ root: __dirname });
const app = mockServer.app;
const resources = mockServer.resources();

resources.create("/todos", (req, res, next) => {next()})
  .mock({"userId": 1 "id": 1 "title": "Marvel" "completed": false})
  .delay(1000) // delay in milliseconds
  .done(); //  Make sure to call done method to create the route.

resources.create("/photos")
  .fetch("https://jsonplaceholder.typicode.com/photos")
  .fetchCount(3);
  .done();

const dbMode = 'multi';
resources.create("/users")
  .send("https://jsonplaceholder.typicode.com/users", dbMode) // value will be to set to `mock` or `fetch` based on dbMode
  .done();

resources.create("/posts")
  .send({ userId: 1 id: 1 title: "Marvel" body: "My First post"})
  .done();

app.use(resources.router);

mockServer.startServer();

const { MockServer } = require('@r35007/mock-server');
const mockServer = MockServer.Create({ root: \_\_dirname });
const app = mockServer.app;
const resources = mockServer.resources();

middlewares = [
    (req, res, next) => {
        next();
    },
    (req, res, next) => {
        next();
    },
];

const db = resources
    .create('/todos', ...middlewares) // can give n number of middlewares and names here
    .send('My Response', mockServer.config.dbMode) // this value will be set to `mock` or `fetch` based on dbMode. alias rely
    .id('todos')
    .description('todos route')
    .mock({ userId: 1, id: 1, title: 'Marvel', completed: false })
    .fetch('https://jsonplaceholder.typicode.com/todos')
    .mockFirst(false)
    .statusCode(200) // alias status(200) can also be used
    .delay(0) // delay in milliseconds
    .fetchCount(1)
    .skipFetchError(false)
    .directUse(false)
    .headers({}) // Set response Headers
    .done({ log: true }); // Make sure to call done method to create the route.
    
console.log(db);
/* db will return the generated db object. This will not be added to the mockserver db until we call done() method
{
    "/todos": {
        "_config": true,
        "id":"todos",
        "description": "todos route",
        "mock":{
            "userId": 1,
            "id": 1,
            "title": "Marvel",
            "completed": false
        },
        "fetch": "https://jsonplaceholder.typicode.com/todos",
        "mockFirst": false,
        "statusCode": 200,
        "delay": 0,
        "fetchCount": 1,
        "skipFetchError": false,
        "directUse": false,
        "headers": {}
    }
}
*/

app.use(resources.router);

mockServer.startServer();

Please check resources api for more custom option reference.

Middlewares

We can use the middlewares by setting it using setData or setMiddlewares.

For Example: middlewares.js

const isAuthorized = (_req) => true;

const auth = (req, res, next) => {
  if (isAuthorized(req)) return next(); // continue to Mock Server router
  res.sendStatus(401);
};

const DataWrapper = (req, res, next) => {
  res.locals.data = {
    status: 'Success',
    message: 'Retrieved Successfully',
    result: res.locals.data,
  };
  next();
};

module.exports = (mockServer) => {
  const { app, routes, data, getDb, getStore } = mockServer || {};
  const { config, db, injectors, middlewares, rewriters, store } = data || {};
  // Our Global middleware logic here before setting default middlewares by the MockServer.

  return {
    _globals: [auth], // These middlewares will be used after the default middlewares
    DataWrapper, // This can used in as a specific route middleware using route configs
  };
};

server.js

const { MockServer } = require('@r35007/mock-server');

const mockServer = MockServer.Create({ root: __dirname });
const app = mockServer.app;

const defaults = mockServer.defaults();
app.use(defaults);

// Always set middlewares after using default middlewares.
// These middlewares will be set to mockServer instance and can be accessed across all routes.
mockServer.setMiddlewares('./middlewares.js');
app.use(mockServer.middlewares._globals);

const resources = mockServer.resources({
  '/fetch/users1/customMiddleware': {
    _config: true,
    fetch: 'http://jsonplaceholder.typicode.com/users',
    middlewares: ['DataWrapper'], // Picks the DataWrapper middleware from middlewares.js
  },
});
app.use(resources.router); // Add Database

Please check Setters for more api reference.

Direct Middleware Use

Usually all the middlewares in the route will be wrapped by some helper middlewares to set delay, get fetch data, set locals etc.. If we wish to provide a middlewares without any wrappers set directUse to true. For Example: db.js

const db = {
  "/static/app1": express.static("./path/to/build/folder/app1")
  "/static/app2": { _config: true, middlewares: express.static("./path/to/build/folder/app2"), directUse: true }
  "/fetch/users": {
    _config: true,
    fetch: "http://jsonplaceholder.typicode.com/users",
    middlewares:(req, res) => { res.send("custom response")},
    directUse: true
  }
}

Note: /fetch/users wont work since it wont be wrapped by helper middlewares and so no other route config would work except the given middleware if provided.

Injectors

Here we are explicitly injecting delay, middlewares, statusCode to the /posts route. We can add any route configs to a specific or to a group of routes using Injectors.

Injectors use path-to-regexp package for route pattern recognition.
Click path-to-regexp for more details.

For Example : injectors.json

[
  { "routes": "/posts", "delay": 2000 } // Adds delay of 2 seconds only to /posts route
  { "routes": "/comments/:id", "statusCode": 500 } // Adds statusCode of 500 for all the route that matches the pattern /comments/:id
]

server.js

const { MockServer } = require('@r35007/mock-server');

const mockServer = MockServer.Create({ root: __dirname, dbMode: 'fetch' });
const resources = mockServer.resources({
  '/posts': 'http://jsonplaceholder.typicode.com/posts', // have delay of 2 seconds
  '/comments/1': 'http://jsonplaceholder.typicode.com/comments/1', // sets status code of 500
  '/comments/2': 'http://jsonplaceholder.typicode.com/comments/2', // sets status code of 500
});

const app = mockServer.app;

// These injectors will be set to mockServer instance and be access across all routes
mockServer.setInjectors('./injectors.json');
app.use(mockServer.middlewares._globals);

// Can also set injectors using setData
// mockServer.setData({ injectors:  "./injectors.json"});

app.use(resources.router); // Add Database

Please check Setters for more api reference.

Override Existing Route Configs

Setting override flag to true helps to override the existing config of that route.

For example :

injectors.json

[
  {
    "routes": ["/injectors/2"],
    "override": true,
    "mock": "This data is injected using the injectors by matching the pattern '/injectors/2'."
  },
  {
    "routes": ["/injectors/:id"],
    "override": true,
    "exact": true,
    "statusCode": 200,
    "mock": "This data is injected using the injectors by exactly matching the route '/injectors/:id'."
  },
  {
    "routes": ["/(.*)"],
    "override": true,
    "middlewares": ["...", "CustomLog"]
  }
]

Note: Use ["..."] If we want to add the existing middlewares.

Common Route Configs

Using wildcards we can set a common route configs to all the routes. /(.*) - matches all the routes.

For example :

injectors.json

[
  {
    "routes": ["/(.*)"],
    "description": "This Description is injected using the injectors. Set 'Override' flag to true to override the existing config values."
  },
  {
    "routes": ["/(.*)"],
    "override": true,
    "middlewares": ["...", "CustomLog"]
  }
]

Make sure we give /(.*) at the end of the injectors.json object to set route configs to all the routes.

Store

Store used to store any values which can be used later for any purpose like response manipulation or logging etc..

We can set store values using mockServer.setStore or using mockServer.setData

Route Store

Route store helps to store any values which can be accessed on by that particular route. This stores values cannot be able to accessed by the other routes. Route Store can be accessed using res.locals.routeConfig.store inside the middleware.

The middlewares _IterateRoutes and _IterateResponse uses the Route store to manipulate response.

Local Store

Local Store helps to store and share data between routes. This can be accessed using res.locals.getStore() inside the middleware.

Rewriters

Create a rewriters.json file. Pay attention to start every route with /.

Rewriters use express-urlrewrite package to rewrite the urls.
Click here for more information about url rewrite.

rewriters.json

{
  "/api/*": "/$1",
  "/:resource/:id/show": "/:resource/:id",
  "/posts/:category": "/posts?category=:category",
  "/articles?id=:id": "/posts/:id"
}

server.js

const mockServer = MockServer.Create();
const app = mockServer.app;
const rewriters = mockServer.Rewriter('./rewriters.json');
app.use(rewriters); // Make sure to use it before all the resources

Now we can access resources using additional routes.

/api/posts # → /posts
/api/posts/1  # → /posts/1
/posts/1/show # → /posts/1
/posts/javascript # → /posts?category=javascript
/articles?id=1 # → /posts/1

Helper Middlewares

Use the helper middleware to speedup our development and for ease of access. By default some helper middlewares used for a route.

Default Helper middlewares

const middlewares = [
  _SetDelay, // sets the delay
  _Fetch, // fetches the data from file or url
  _SetStatusCode, // sets status code
  _SetHeaders, // sets headers
  _CrudOperation, // does CRUD operations
  ...userMiddlewares, // Our cust user middleware will be called here
  _SetStatusCode, // sets status code
  _SetHeaders, // sets headers
  _SendResponse, // sends the response
];

// or

const middlewares = withHelperWrappers(userMiddlewares); // wraps the user middleware with the helper middlewares

Note: These helper middlewares will not be used if we set directUse: true in a route config.

IterateResponse

setting middleware to _IterateResponse helps to send we a iterate the response one after the other in the mock array for each url hit.

example:

{
  "/middleware/example/_IterateResponse": {
    "_config": true,
    "description": "This route iterates through each data. Try to hit again to see the data change. Note: The data must be of type array",
    "fetch": {
      "url": "http://jsonplaceholder.typicode.com/photos"
    },
    "middlewares": ["_IterateResponse"]
  }
}

Now go and hit http://localhost:3000/middleware/example/_IterateResponse. For each hit we will get the next object in an array from the photos data.

IterateRoutes

setting middleware to _IterateRoutes helps to send a iterate the route one after the other in the mock array for each url hit.

example:

{
  "/middleware/example/_IterateRoutes": {
    "_config": true,
    "description": "This route iterates through each route provide in the mock. Try to hit again to see the route change. Note: The data must be of type array",
    "mock": ["/injectors/1", "/injectors/2"],
    "middlewares": ["_IterateRoutes"]
  },
  "/injectors/1": "/injectors/1 data",
  "/injectors/2": "/injectors/2 data"
}

Now go and hit http://localhost:3000/middleware/example/_IterateRoutes. For each hit the route is passed to next matching url provided in the mock list.

CrudOperations

By default handles all the crud operations of the given data.

Note: The mock must of type Array of objects and must contain a unique value of attribute id. This id attribute can also be changes using config.id.

For example: config.json

{
  "id": "_id"
}

Others

_Fetch fetches data from file or url.
_SetDelay sets status code from res.locals.delay.
_SetStatusCode sets status code from res.locals.statusCode.
_SetHeaaders sets headers from res.locals.headers.
_SendResponse sends the response from res.locals.data.
_FetchTillData helps to fetch the data from url until it get a success data. Once its get the data the fetch call stops and returns the existing data for other route hit.
_SetFetchDataToMock sets every fetchData to Mock. This overrides the existing mock with the fetchData.
_MockOnly sends we only Mock data even if there is any fetchData or store data.
_FetchOnly sends we only Fetch data even if there is any _mock or store data.
_ReadOnly forbidden every Http method calls except GET call.

App Configuration

Mock Server uses cosmiconfig for configuration file support. This means you can configure Mock Server via (in order of precedence):

A mock-server key in your package.json file.
A .mock-serverrc, .mock-serverrc.json, .mock-server.config.json, mock-server-config.json file.
A .mockserverrc, .mockserverrc.json, .mockserver.config.json, mockserver-config.json file.
A .mock-serverrc.<js|cjs>, .mock-server.config.<js|cjs>, mock-server-config.<js|cjs> file that exports an object using module.exports.
A .mockserverrc.<js|cjs>, .mockserver.config.<js|cjs>, mockserver-config.<js|cjs> file that exports an object using module.exports.

The configuration file will be resolved starting from the location of the file being formatted, and searching up the file tree until a config file is (or isn’t) found.

Mock Server intentionally doesn’t support any kind of global configuration. This is to make sure that when a project is copied to another computer, Mock Server's behavior stays the same. Otherwise, Mock Server wouldn’t be able to guarantee that everybody in a team gets the same consistent results.

The options you can use in the configuration file are

JSON:

{
  "port": 3000,
  "host": "localhost"
}

JS:

module.exports = {
  port: 3000,
  host: 'localhost',
};

Complete Options: JS:

// These are default config.
const path = require('path');
const public = path.join(process.cwd(), 'public');

module.exports = {
  port: 3000, // Set Port to 0 to pick a random available port.
  host: 'localhost', // Set Host to empty string to pick the Local Ip Address.
  root: process.cwd(), // Root path of the server. All paths refereed in db data will be relative to this path
  base: '', // Mount db on a base url
  id: 'id', // Set db id attribute.
  dbMode: 'mock', // Give one of 'multi', 'fetch', 'mock'
  static: public, // Path to host a static files. Give empty string to avoid hosting public folder by default
  reverse: false, // Generate routes in reverse order
  logger: true, // Enable api logger
  noCors: false, // Disable CORS
  noGzip: false, // Disable data compression
  noCache: true, // Disable Caching
  readOnly: false, // Allow only GET calls
  bodyParser: true, // Enable body-parser
  cookieParser: true, // Enable cookie-parser
  quiet: false, // Disable console logs
};

dbMode

The object which has _config: true are considered as route configs. All other values and objects are considered as direct values. Db mode defines on what config does the direct route value to be assigned. The object with _config: true will not be changed on any dbMode. For Example :

dbMode is mock - All direct values will be assigned to mock attribute

const db = {
  route1: 'My Response', // "/route1": { _config: true, mock: "My Response" }
  route2: { data: 'My Response' }, // "/route2": { _config: true, mock: { data: "My Response" } }
  route3: [], // "/route3": { _config: true, mock: [] }
  route4: { _config: true, fetch: 'path/to/file' }, // "/route4": { _config: true, fetch: "path/to/file" }
};

dbMode is fetch - All direct values will be assigned to fetch attribute

const db = {
  route1: 'path/to/file', // "/route1": { _config: true, fetch: "path/to/file"  }
  route2: { url: 'path/to/file' }, // "/route2": { _config: true, fetch: { url: "path/to/file" } }
  route3: { _config: true, mock: 'My Response' }, // "/route3": { _config: true, mock: "My Response" }
};

dbMode is multi - Only direct string value will be assigned to fetch attribute. All other values will be assigned to mock attribute

const db = {
  route1: 'path/to/file', // "/route1": { _config: true, fetch: "path/to/file"  }
  route2: { data: 'My Response' }, // "/route2": { _config: true, mock: { data: "My Response" } }
  route3: [], // "/route3": { _config: true, mock: [] }
  route4: { _config: true, mock: 'My Response' }, // "/route4": { _config: true, mock: "My Response" }
};

Route Config

Route config helps to define a config such as delay. statuscode to a specific route. Routes which as a object with _config: true as considered as a route config.

interface RouteConfig {
  _config?: boolean; // Make sure to set this to true to use this object as a route configuration.
  id?: string; // sets a base64 encoded route. If not given, will be generated.
  description?: string; // Description about this Route.
  statusCode?: number; // Set custom status code in number between 100 to 600.
  headers?: object; // Set custom response headers.
  delay?: number; // Set custom delay in milliseconds.
  fetch?: string | AxiosRequestConfig; // Set path to fetch a file. Path will be relative to `config.root`. Always make fetch call first.
  fetchCount?: number; // Set custom fetch count. Set to -1 to fetch infinite times. Default: 1
  mock?: any; // Set custom Mock Response. If fetch is given then it returns the fetch response.
  mockFirst?: boolean; // If true, It returns the mock response first else returns the fetch response . Default: false
  skipFetchError?: boolean; // If true it skips any fetch error and send the mock data as response. Default: false.
  store?: object; // Helps to store any values for later use
  middlewares?: express.RequestHandler | Array<express.RequestHandler> | string; // Set custom middleware specific to this route

  // This will be auto generated from the fetch call it makes.
  fetchData?: {
    status?: number;
    message?: string;
    isError?: boolean;
    headers?: any;
    response?: any;
    stack?: any;
  };
  _isFile?: boolean;
  _request?: AxiosRequestConfig;
  _extension?: string;
}

Note: Object without _config: true will be considered as a direct mock response. Please make sure we set config: true to config the route.

Set Custom Delay

delay helps we to set a custom delay to our routes.

{
  "/customDelay": {
    "_config": true,
    "delay": 2000, // The delay must be in milliseconds and of type number
    "description": "Note: give delay in milliseconds",
    "mock": "This is response is received with a delay of 2000 milliseconds"
  }
}

Now if we go to http://localhost:3000/customDelay, we'll get the response in a delay of 2 seconds.

Set Custom StatusCode

statusCode helps we set a custom statusCode to our routes. It must be of type number and between 100 to 600.

{
  "/customStatusCode": {
    "_config": true,
    "statusCode": 500,
    "mock": "This is response is received with a statusCode of 500"
  }
}

Now if we go to http://localhost:3000/customStatusCode, we'll get the response with a 500 statusCode

Fetch File or URL

fetch helps we get data from url. The url can either be a http server or a local file.

Fetch File

Give a absolute or a relative path to fetch any file.

{
  "/fetch/local/file": {
    "_config": true,
    "description": "The given fetch path will be relative to the root path given in config",
    "fetch": "./data/users.json"
  }
}

Note: The given path will be relative to config.root.

Fetch Data From URL

{
  "/fetch/posts/:id": {
    "_config": true,
    "fetch": "https://jsonplaceholder.typicode.com/posts/${req.params.id}"
  }
}

Axios Fetch Request

We can also give a fetch as a axios request object with custom options.

{
  "/fetch/posts/:id": {
    "_config": true,
    "description": "Give the `fetch` attribute as a axios request object. enclose the value with ${<variables>} to pass the req values",
    "fetch": {
      "method": "GET",
      "url": "http://jsonplaceholder.typicode.com/posts",
      "params": "${req.params.id}"
    }
  }
}

http://localhost:3000/fetch/posts/2.

Note: To pass any options from the route set the option value as ${<option Name>}

reserved key words :

${config} - get all config values
${req} - get all req values

Fetch Count

In Route Config setting fetchCount will helps to limit the number of fetch calls. By Default the fetchCount is set to 1. The fetch data will be set to fetchData.

db.json

{
  "/fetch/todos/fetchCount/3/times": {
    "_config": true,
    "description": "By default the fetch will be called only one time. We can limit or extend the number of fetch calls using 'fetchCount' attribute",
    "fetch": "http://jsonplaceholder.typicode.com/todos",
    "fetchCount": 3
  },
  "/fetch/albums/fetchCount/Infinite/times": {
    "_config": true,
    "description": "Setting 'fetchCount' to -1 time will helps to make a fetch call on each and every url hit without any limit. By This way we always get a new fresh data from the fetch url.",
    "fetch": "http://jsonplaceholder.typicode.com/albums",
    "fetchCount": -1
  }
}

http://localhost:3000/fetch/todos/fetchCount/3/times. - Makes fetch call only for 3 times.

http://localhost:3000/fetch/todos/fetchCount/Infinite/times. - Makes fetch call Infinite times.

Skip Fetch Error

If skipFetchError is set to true, It will skip any error in fetch call and instead of returning that fetch error it gives we the mock data.

{
  "/fetch/404/skipFetchError": {
    "_config": true,
    "description": "Bu default fetch returns the actual error if occur. If we set `skipFetchError` flag to true. the If any error occur in fetch call it will then skips the fetch error and return we the mock data",
    "fetch": "http://localhost:3000/404",
    "skipFetchError": true,
    "mock": "This data is returned due to some error in fetch call. We can see the error in 'fetchError' attribute",
    "fetchCount": -1
  }
}

Specific Middlewares

We can add n number of middleware to a route which helps we to manipulate or log the data.

Please check Middlewares fro more reference.

db.js

const db = {
  '/fetch/users1/customMiddleware': {
    _config: true,
    fetch: 'http://jsonplaceholder.typicode.com/users',
    middlewares: ['DataWrapper'], // Picks the DataWrapper middleware from middlewares.js
  },
  '/fetch/users2/customMiddleware': {
    _config: true,
    fetch: 'http://jsonplaceholder.typicode.com/users',
    middlewares: (req, res, next) => {
      next();
    },
  },
};

Locals

res.locals helps to access the current route config, fetchData, store etc.. Here are the available options in res.locals

interface Locals {
  routePath: string;
  routeConfig: RouteConfig;
  data: any; // response will be sent using this attribute value.
  config: Config; // gives we the current mock server configuration.
  getStore(): object;
  getDb(): object;
}

Dynamic Route Config

RouteConfigs are mutable. Means we can able to modify the routeConfigs in runtime using middleware. For Example:

middleware.js

exports._FetchTillData = (_req, res, next) => {
  const locals = res.locals;
  const routeConfig = locals.routeConfig;

  if (!routeConfig.fetchData) return next();

  if (!routeConfig.fetchData.isError) {
    // If fetchData has no error then stop fetching anymore
    routeConfig.fetchCount = 0; // setting fetchCount to zero stops fetching
  } else if (routeConfig.fetchCount !== undefined && routeConfig.fetchCount == 0) {
    // If fetchData has any error then keep on fetching
    routeConfig.fetchCount = -1; // setting fetchCount to -1 does an infinite fetch
  }
  next();
};

The above middleware helps to fetch the data from url until it gets a valid success response.

Home Page Routes

Home Page - http://localhost:3000
Db - http://localhost:3000/_db
- Use http://localhost:3000/_db?_clean=true to get a clean db data.
- Use http://localhost:3000/_db?_config=true to get only route configs.
Rewriters - http://localhost:3000/_rewriters
Routes - http://localhost:3000/_routes
Store - http://localhost:3000/_store
Reset Db - http://localhost:3000/_reset

API

MockServer

returns the instance of the mockServer.

const { MockServer } = require('@r35007/mock-server');
const mockServer = new MockServer('./config.json');

Params

| Name | Type | Required | Description | | ------ | ------------- | -------- | ------------------------------------- | | config | string/object | No | This object sets the port, host etc.. |

Create

returns the single instance of the mockServer.

const { MockServer } = require('@r35007/mock-server');
const mockServer = MockServer.Create('./config.json');

Params

| Name | Type | Required | Description | | ------ | --------------- | -------- | ------------------------------------- | | config | string / object | No | This object sets the port, host etc.. |

Destroy

Destroy simply stops the server without any exception and resets the server. returns promise

const { MockServer } = require('@r35007/mock-server');
let mockServer = MockServer.Create();
await MockServer.Destroy(mockServer);

Params

| Name | Type | Required | Description | | ---------- | -------- | -------- | ------------------------------------- | | mockServer | instance | No | Instance of the MockServer to Destroy |

launchServer

It validates all the params in the MockServer, loads the resources and starts the server.

mockServer.launchServer('./db.json', {
  injectors: './injectors.json',
  middlewares: './middleware.js',
  rewriters: './rewriters.json',
  store: './store.json',
  router: express.Router(),
  log: false,
});

Params

| Name | Type | Required | Description | | ------- | -------------------- | -------- | ---------------------------- | | db | string/object/method | No | Set db resource | | options | object | No | option to create db resource |

[options]

| Name | Type | Required | Description | | ----------- | -------------------- | -------- | ------------------------------------------ | | injectors | string/object/method | No | injectors to inject routeconfig to this db | | middlewares | string/object/method | No | middlewares of this db | | store | string/object/method | No | store of this db | | rewriters | string/object/method | No | rewriters of this db | | router | Express.Router | No | Custom Router | | log | boolean | No | If tru it logs the setter log |

rewriter

Sets the route rewrites and return the router of the rewriters;

const rewriters = mockServer.rewriter('./rewriters.json', {
  log: false,
  root: __dirname,
});
app.use(rewriters);

Params

| Name | Type | Required | Description | | --------- | --------------- | -------- | ----------------------- | | rewriters | string / object | No | Give the Rewrites | | options | object | No | option to set rewriters |

[options]

| Name | Type | Required | Description | | ---- | ------- | -------- | ---------------------------------------------- | | root | string | No | To require rewriter file relative to this path | | log | boolean | No | If true it logs the rewriters setting log |

defaults

returns the list of default middlewares. Also helps to host a static directory.

const defaults = mockServer.defaults({ static: './public', readOnly: true });
app.use(defaults);

options
- static path to static files
- logger enable logger middleware (default: true)
- noGzip disable Compression (default: false)
- noCors disable CORS (default: false)
- readOnly accept only GET requests (default: false)
- bodyParser enable body-parser middleware (default: true)
- cookieParser enable cookie-parser middleware (default: true)

resources

Create db resources. It uses global injectors, middlewares and config to crete db resource.

const resources = mockServer.resources('./db.json');
app.use(resources.router);

Create db resources with custom injectors and middlewares. It won't use global injectors and middlewares. It sets only db and not the injectors or middlewares.

const resources = mockServer.resources("./db.json", {
  injectors: "./injectors.json",
  middlewares: "./middleware.js",
  root: __dirname,
  dbMode: "mock",
  reverse: false,
  router: express.Router();
  log: false
});

middlewares = (req, res, next) => { next() };

// /todos will be added to existing db
const db = resources
  .create("/todos", middlewares) // can give n number of middlewares and names here
  .send("My Response", 'multi') // response will set to `mock` or `fetch` based on dbMode
  .id("todos")
  .description("todos route")
  .mock({ userId: 1, id: 1, title: "Marvel", completed: false })
  .fetch("https://jsonplaceholder.typicode.com/todos")
  .mockFirst(false)
  .statusCode(200)
  .delay(0) // delay in milliseconds
  .fetchCount(1)
  .skipFetchError(false)
  .directUse(false)
  .headers({}) // set response headers
  .done();

app.use(resources.router);

Params

[options]

| Name | Type | Required | Description | | ----------- | ----------------------- | -------- | ------------------------------------------ | | root | string | No | root to get db from a file | | dbMode | 'mock'/ 'fetch'/'multi' | No | dbMode to create resource | | injectors | string/object/method | No | injectors to inject routeconfig to this db | | middlewares | string/object/method | No | middlewares of this db | | reverse | boolean | No | If true it creates db in reverse order | | router | Express.Router | No | Custom Router | | log | boolean/string | No | If tru it logs the resources setting log |

homePage

Returns Mock Server Home Page router.

const homePage = mockServer.homePage();
app.use(homePage);

Params

| Name | Type | Required | Description | | ---- | ------- | -------- | ---------------------------------------- | | log | boolean | No | If tru it logs the resources setting log |

startServer

Returns a Promise of Server. - helps to start the app server externally

const server = await mockServer.startServer(3000, 'localhost');

Params

| Name | Type | Required | Description | | ---- | ------ | -------- | --------------- | | port | number | No | Set custom Port | | host | string | No | Set custom Host |

stopServer

Returns a Promise of Boolean. - helps to stop the app server externally

const isStopped = await mockServer.stopServer();

resetServer

Clears out all values and resets the server for a fresh start. By default this method will be called on mockServer.stopServer() method.

mockServer.resetServer();

resetDb

Returns the routes that are reset.

const routes = mockServer.resetDb(); // If param is not present, it resets all the routes.

Params

| Name | Type | Required | Description | | ---------- | -------- | -------- | -------------------------------- | | ids | string[] | No | Give List of route ids to reset | | routePaths | string[] | No | Give List of routePaths to reset |

pageNotFound

It is a middleware to handle a page not found error. Please use it at the end of all routes.

app.use(mockServer.pageNotFound);

errorHandler

It is a middleware to handle a any error occur in server. Please use it at the end of all routes.

app.use(mockServer.errorHandler);

Getters

const MockServer = require('@r35007/mock-server').default;
const mockServer = MockServer.Create();

// Please avoid directly modify or setting values to these variable.
// Use Setter method to modify or set any values.

// server, port, address, listeningTo will be undefined when server is stopped
const  port: number | undefined; // gives current running port.
const  server: Server | undefined; //  gives current running server.
const  address: string | undefined; // gives host ip address.
const  listeningTo: string | undefined; // gives -> http://${host}:${port}/${base} -> http://localhost:3000/api

const app = mockServer.app;
const data = mockServer.data;
// const { db, injectors, middlewares, rewriters, config, store } = mockServer.data

const db = mockServer.db;
const middleware = mockServer.middleware;
const injectors = mockServer.injectors;
const rewriters = mockServer.rewriters;
const config = mockServer.config;
const store = mockServer.store;
const initialDb = mockServer.initialDb;

// Node Package exposes
const _ = MockServer._ // lodash.
const axios = MockServer.axios // axios.
const express = MockServer.express // express.
const chalk = MockServer.chalk // chalk.
const watcher = MockServer.watcher // chokidar.
const pathToRegexp = MockServer.pathToRegexp // pathToRegexp.
const nanoid = MockServer.nanoid // nanoid.
const ora = MockServer.ora // ora

Setters

const MockServer = require('@r35007/mock-server').default;
const mockServer = MockServer.Create();

mockServer.setData({ db, injectors, middlewares, rewriters, store, config });

//or

// Please follow the same following order of setting the data
// If merge param is true. it adds the data with the existing data.
mockServer.setConfig(config, { root, merge, log });
mockServer.setMiddlewares(middlewares, { root, merge, log });
mockServer.setInjectors(injectors, { root, merge, log });
mockServer.setRewriters(rewriters, { root, merge, log });
mockServer.setStore(store, { root, merge, log });
mockServer.setDb(Db, { root, merge, log, injectors, reverse, dbMode });

// Set to Defaults
mockserver.setDefaults(); // sets default db, injectors, middlewares, store, rewriters, config
mockserver.setDefaultData(); // sets default injectors, middlewares, store, config
mockserver.setDefaultDb(); // sets default db
mockserver.setDefaultInjectors(); // sets default injectors
mockserver.setDefaultMiddlewares(); // sets default middlewares
mockserver.setDefaultRewriters(); // sets default rewriters
mockserver.setDefaultStore(); // sets default store
mockserver.setDefaultConfig(); // sets default config

mockserver.clearServerAddress(); // sets current port, address, listeningTo, server to `undefined`
mockserver.setExpressApp(); // create a new express app to the MockServer instance.

Libs

Few Libraries has been exposed for ease

const {
  MockServer,
  express, // express
  lodash, // lodash
  nanoid, // nanoid
  spinner, // ora
  pathToRegexp, // path-to-regexp
  chalk, // chalk
  axios, // axios
  watcher, // chokidar.
} = require('@r35007/mock-server');

Validators

These helps to return a valid data from provided file path or object.

const {
  getValidDb,
  getValidMiddlewares,
  getValidInjectors,
  getValidRewriters,
  getValidConfig,
  getValidStore,
  getValidRouteConfig,
} = require('@r35007/mock-server/dist/utils/validators');

const options = {
  reverse: true, // If true the db will be generated in reverse order
  dbMode: 'fetch', // The direct route value will be set to fetch
};

const root = './';

const db = getValidDb(
  'db.json', // db or HAR
  { injectors, root, reverse, dbMode, mockServer }
); // returns valid Db combined with the given injectors. Also helps to extract a db from HAR file. internally use getValidRouteConfig
const middleware = getValidMiddlewares(middlewares, { root, mockServer }); // returns a valid middleware along with the default middlewares
const injectors = getValidInjectors(injectors, { root, mockServer }); // returns a valid injectors. internally use getValidInjectorConfig
const rewriters = getValidRewriters(rewriters, { root, mockServer }); // returns a valid rewriters
const config = getValidConfig(config, { root, mockServer }); // returns a valid config combined with the default configs
const store = getValidStore(store, { root }); // returns a valid store
const routeConfig = getValidRouteConfig(route, routeConfig); // returns a valid routeconfig used by getValidDb
const injectorConfig = getValidInjectorConfig(route, routeConfig); // returns a valid injectorsConfig used by getValidInjectors
const route = getValidRoute(route); // splits route by comma and adds a slash ('/') prefix to the routes

VS Code Extension

Thinker.mock-server

thinker.mock-server

Author

Sivaraman - [email protected]

GitHub - https://github.com/R35007/Mock-Server

License

MIT

Published

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Readme

Mock Server

Getting started

Routes

Params

Conditions

Range

Paginate

Sort

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Nested and array fields

Group By

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Serving static files

CLI Usage

Using JS Module

Database

Database with Custom Options

Database with Create method

Middlewares

Direct Middleware Use

Injectors

Override Existing Route Configs

Common Route Configs

Store

Route Store

Local Store

Rewriters

Helper Middlewares

Default Helper middlewares

IterateResponse

IterateRoutes

CrudOperations

Others

App Configuration

dbMode

Route Config

Set Custom Delay

Set Custom StatusCode

Fetch File or URL

Fetch File

Fetch Data From URL

Axios Fetch Request

Fetch Count

Skip Fetch Error

Specific Middlewares

Locals

Dynamic Route Config

Home Page Routes

API

MockServer

Create

Destroy

launchServer

rewriter

defaults

resources

homePage

startServer

stopServer

resetServer

resetDb

pageNotFound

errorHandler

Getters

Setters

Libs

Validators

VS Code Extension

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