koa-joi-router-alt
v9.0.0
Published
Configurable, input validated routing for koa.
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joi-router
Easy, rich and fully validated koa routing.
Features:
- built in input validation using joi
- built in output validation using joi
- built in body parsing using co-body and await-busboy
- built on the great @koa/router
- exposed route definitions for later analysis
- string path support
- regexp-like path support
- multiple method support
- multiple middleware support
- continue on error support
- router prefixing support
- router level middleware support
- meta data support
- HTTP 405 and 501 support
Node compatibility
NodeJS >= 12
is required.
Example
const koa = require('koa');
const router = require('koa-joi-router');
const Joi = router.Joi;
const public = router();
public.get('/', async (ctx) => {
ctx.body = 'hello joi-router!';
});
public.route({
method: 'post',
path: '/signup',
validate: {
body: {
name: Joi.string().max(100),
email: Joi.string().lowercase().email(),
password: Joi.string().max(100),
_csrf: Joi.string().token()
},
type: 'form',
output: {
200: {
body: {
userId: Joi.string(),
name: Joi.string()
}
}
}
},
handler: async (ctx) => {
const user = await createUser(ctx.request.body);
ctx.status = 201;
ctx.body = user;
}
});
const app = new koa();
app.use(public.middleware());
app.listen(3000);
Usage
koa-joi-router
returns a constructor which you use to define your routes.
The design is such that you construct multiple router instances, one for
each section of your application which you then add as koa middleware.
const Koa = require("koa")
const router = require('koa-joi-router');
const pub = router();
const admin = router();
const auth = router();
// add some routes ..
pub.get('/some/path', async () => {});
admin.get('/admin', async () => {});
auth.post('/auth', async () => {});
const app = new Koa();
app.use(pub.middleware());
app.use(admin.middleware());
app.use(auth.middleware());
app.listen();
Module properties
.Joi
It is HIGHLY RECOMMENDED you use this bundled version of Joi to avoid bugs related to passing an object created with a different release of Joi into the router.
const koa = require('koa');
const router = require('koa-joi-router');
const Joi = router.Joi;
Router instance methods
.route()
Adds a new route to the router. route()
accepts an object or array of objects
describing route behavior.
const router = require('koa-joi-router');
const public = router();
public.route({
method: 'post',
path: '/signup',
validate: {
header: joiObject,
query: joiObject,
params: joiObject,
body: joiObject,
maxBody: '64kb',
output: { '400-600': { body: joiObject } },
type: 'form',
failure: 400,
continueOnError: false
},
pre: async (ctx, next) => {
await checkAuth(ctx);
return next();
},
handler: async (ctx) => {
await createUser(ctx.request.body);
ctx.status = 201;
},
meta: { 'this': { is: 'stored internally with the route definition' }}
});
or
const router = require('koa-joi-router');
const public = router();
const routes = [
{
method: 'post',
path: '/users',
handler: async (ctx) => {}
},
{
method: 'get',
path: '/users',
handler: async (ctx) => {}
}
];
public.route(routes);
.route() options
method
: required HTTP method like "get", "post", "put", etcpath
: required stringvalidate
header
: object which conforms to Joi validationquery
: object which conforms to Joi validationparams
: object which conforms to Joi validationbody
: object which conforms to Joi validationmaxBody
: max incoming body size for forms or json inputfailure
: HTTP response code to use when input validation fails. default400
type
: if validating the request body, this is required. eitherform
,json
ormultipart
formOptions
: options for co-body form parsing whentype: 'form'
jsonOptions
: options for co-body json parsing whentype: 'json'
multipartOptions
: options for busboy parsing whentype: 'multipart'
- any busboy constructor option. eg
{ limits: { files: 1 }}
autoFields
: Determines whether form fields should be auto-parsed (default:true
). See the await-busboy docs.
- any busboy constructor option. eg
output
: see output validationcontinueOnError
: if validation fails, this flags determines ifkoa-joi-router
should continue processing the middleware stack or stop and respond with an error immediately. useful when you want your route to handle the error response. defaultfalse
validateOptions
: options for Joi validate. default{}
handler
: required async function or functionspre
: async function or function, will be called before parser and validatorsmeta
: meta data about this route.koa-joi-router
ignores this but stores it along with all other route data
.get(),post(),put(),delete() etc - HTTP methods
koa-joi-router
supports the traditional router.get()
, router.post()
type APIs
as well.
const router = require('koa-joi-router');
const admin = router();
// signature: router.method(path [, config], handler [, handler])
admin.put('/thing', handler);
admin.get('/thing', middleware, handler);
admin.post('/thing', config, handler);
admin.delete('/thing', config, middleware, handler);
.use()
Middleware run in the order they are defined by .use()(or .get(), etc.) They are invoked sequentially, requests start at the first middleware and work their way "down" the middleware stack which matches Express 4 API.
const router = require('koa-joi-router');
const users = router();
users.get('/:id', handler);
users.use('/:id', runThisAfterHandler);
.prefix()
Defines a route prefix for all defined routes. This is handy in "mounting" scenarios.
const router = require('koa-joi-router');
const users = router();
users.get('/:id', handler);
// GET /users/3 -> 404
// GET /3 -> 200
users.prefix('/users');
// GET /users/3 -> 200
// GET /3 -> 404
.param()
Defines middleware for named route parameters. Useful for auto-loading or validation.
See @koa/router
const router = require('koa-joi-router');
const users = router();
const findUser = (id) => {
// stub
return Promise.resolve('Cheddar');
};
users.param('user', async (id, ctx, next) => {
const user = await findUser(id);
if (!user) return ctx.status = 404;
ctx.user = user;
await next();
});
users.get('/users/:user', (ctx) => {
ctx.body = `Hello ${ctx.user}`;
});
// GET /users/3 -> 'Hello Cheddar'
.middleware()
Generates routing middleware to be used with koa
. If this middleware is
never added to your koa
application, your routes will not work.
const router = require('koa-joi-router');
const public = router();
public.get('/home', homepage);
const app = koa();
app.use(public.middleware()); // wired up
app.listen();
Additions to ctx.state
The route definition for the currently matched route is available
via ctx.state.route
. This object is not the exact same route
definition object which was passed into koa-joi-router, nor is it
used internally - any changes made to this object will
not have an affect on your running application but is available
to meet your introspection needs.
const router = require('koa-joi-router');
const public = router();
public.get('/hello', async (ctx) => {
console.log(ctx.state.route);
});
Additions to ctx.request
When using the validate.type
option, koa-joi-router
adds a few new properties
to ctx.request
to faciliate input validation.
ctx.request.body
The ctx.request.body
property will be set when either of the following
validate.type
s are set:
- json
- form
json
When validate.type
is set to json
, the incoming data must be JSON. If it is not,
validation will fail and the response status will be set to 400 or the value of
validate.failure
if specified. If successful, ctx.request.body
will be set to the
parsed request input.
admin.route({
method: 'post',
path: '/blog',
validate: { type: 'json' },
handler: async (ctx) => {
console.log(ctx.request.body); // the incoming json as an object
}
});
form
When validate.type
is set to form
, the incoming data must be form data
(x-www-form-urlencoded). If it is not, validation will fail and the response
status will be set to 400 or the value of validate.failure
if specified.
If successful, ctx.request.body
will be set to the parsed request input.
admin.route({
method: 'post',
path: '/blog',
validate: { type: 'form' },
handler: async (ctx) => {
console.log(ctx.request.body) // the incoming form as an object
}
});
ctx.request.parts
The ctx.request.parts
property will be set when either of the following
validate.type
s are set:
- multipart
multipart
When validate.type
is set to multipart
, the incoming data must be multipart data.
If it is not, validation will fail and the response
status will be set to 400 or the value of validate.failure
if specified.
If successful, ctx.request.parts
will be set to an
await-busboy object.
admin.route({
method: 'post',
path: '/blog',
validate: { type: 'multipart' },
handler: async (ctx) => {
const parts = ctx.request.parts;
let part;
try {
while ((part = await parts)) {
// do something with the incoming part stream
part.pipe(someOtherStream);
}
} catch (err) {
// handle the error
}
console.log(parts.field.name); // form data
}
});
Handling non-validated input
Note: if you do not specify a value for validate.type
, the
incoming payload will not be parsed or validated. It is up to you to
parse the incoming data however you see fit.
admin.route({
method: 'post',
path: '/blog',
validate: { },
handler: async (ctx) => {
console.log(ctx.request.body, ctx.request.parts); // undefined undefined
}
})
Validating output
Validating the output body and/or headers your service generates on a per-status-code basis is supported. This comes in handy when contracts between your API and client are strict e.g. any change in response schema could break your downstream clients. In a very active codebase, this feature buys you stability. If the output is invalid, an HTTP status 500 will be used.
Let's look at some examples:
Validation of an individual status code
router.route({
method: 'post',
path: '/user',
validate: {
output: {
200: { // individual status code
body: {
userId: Joi.string(),
name: Joi.string()
}
}
}
},
handler: handler
});
Validation of multiple individual status codes
router.route({
method: 'post',
path: '/user',
validate: {
output: {
'200,201': { // multiple individual status codes
body: {
userId: Joi.string(),
name: Joi.string()
}
}
}
},
handler: handler
});
Validation of a status code range
router.route({
method: 'post',
path: '/user',
validate: {
output: {
'200-299': { // status code range
body: {
userId: Joi.string(),
name: Joi.string()
}
}
}
},
handler: handler
});
Validation of multiple individual status codes and ranges combined
You are free to mix and match ranges and individual status codes.
router.route({
method: 'post',
path: '/user',
validate: {
output: {
'200,201,300-600': { // mix it up
body: {
userId: Joi.string(),
name: Joi.string()
}
}
}
},
handler: handler
});
Validation of output headers
Validating your output headers is also supported via the headers
property:
router.route({
method: 'post',
path: '/user',
validate: {
output: {
'200,201': {
body: {
userId: Joi.string(),
name: Joi.string()
},
headers: Joi.object({ // validate headers too
authorization: Joi.string().required()
}).options({
allowUnknown: true
})
},
'500-600': {
body: { // this rule only runs when a status 500 - 600 is used
error_code: Joi.number(),
error_msg: Joi.string()
}
}
}
},
handler: handler
});
Router instance properties
.routes
Each router exposes it's route definitions through it's routes
property.
This is helpful when you'd like to introspect the previous definitions and
take action e.g. to generate API documentation etc.
const router = require('koa-joi-router');
const admin = router();
admin.post('/thing', { validate: { type: 'multipart' }}, handler);
console.log(admin.routes);
// [ { path: '/thing',
// method: [ 'post' ],
// handler: [ [Function] ],
// validate: { type: 'multipart' } } ]
Path RegExps
Sometimes you need RegExp
-like syntax support for your route definitions.
Because path-to-regexp
supports it, so do we!
const router = require('koa-joi-router');
const admin = router();
admin.get('/blog/:year(\\d{4})-:day(\\d{2})-:article(\\d{3})', async (ctx, next) => {
console.log(ctx.request.params) // { year: '2017', day: '01', article: '011' }
});
Multiple methods support
Defining a route for multiple HTTP methods in a single shot is supported.
const router = require('koa-joi-router');
const admin = router();
admin.route({
path: '/',
method: ['POST', 'PUT'],
handler: fn
});
Multiple middleware support
Often times you may need to add additional, route specific middleware to a single route.
const router = require('koa-joi-router');
const admin = router();
admin.route({
path: '/',
method: ['POST', 'PUT'],
handler: [ yourMiddleware, yourHandler ]
});
Nested middleware support
You may want to bundle and nest middleware in different ways for reuse and organization purposes.
const router = require('koa-joi-router');
const admin = router();
const commonMiddleware = [ yourMiddleware, someOtherMiddleware ];
admin.route({
path: '/',
method: ['POST', 'PUT'],
handler: [ commonMiddleware, yourHandler ]
});
This also works with the .get(),post(),put(),delete(), etc HTTP method helpers.
const router = require('koa-joi-router');
const admin = router();
const commonMiddleware = [ yourMiddleware, someOtherMiddleware ];
admin.get('/', commonMiddleware, yourHandler);
Handling errors
By default, koa-joi-router
stops processing the middleware stack when either
input validation fails. This means your route will not be reached. If
this isn't what you want, for example, if you're writing a web app which needs
to respond with custom html describing the errors, set the validate.continueOnError
flag to true. You can find out if validation failed by checking ctx.invalid
.
admin.route({
method: 'post',
path: '/add',
validate: {
type: 'form',
body: {
id: Joi.string().length(10)
},
continueOnError: true
},
handler: async (ctx) => {
if (ctx.invalid) {
console.log(ctx.invalid.header);
console.log(ctx.invalid.query);
console.log(ctx.invalid.params);
console.log(ctx.invalid.body);
console.log(ctx.invalid.type);
}
ctx.body = await render('add', { errors: ctx.invalid });
}
});
Development
Running tests
npm test
runs tests + code coverage + lintnpm run lint
runs lint onlynpm run lint-fix
runs lint and attempts to fix syntax issuesnpm run test-cov
runs tests + test coveragenpm run open-cov
opens test coverage results in your browsernpm run test-only
runs tests only