A tiny route/api semantic versioning library for Koa and Express.

Installation

npm install route-v

Default Behavior

Gets the version from the URL (originalUrl) and expects Routes/APIs to look like Koa or Express middleware.

Features

• Supports all semver ranges E.g. <2.x, *, ~1.0.0.
• Supports Koa and Express by default.
• Easily change the version source E.g, from URL to headers or both.
• Can be used to version any function (May require some configurations).

Migration from version 2 to 3 notes:

1. Removed the deprecated property register returned by the function constructor, use v instead.
2. Removed the deprecated property version returned by the function versionChecker, use range instead.
3. versionExtractor now takes exactly the same arguments as your versioned routes (functions)

Usage

Registering routes

const Koa = require('koa');
const Router = require('koa-router');
const {v} = require('route-v')();

// This regex will check if the url has a version number in it.
const baseUrl = '/(v\\d+.\\d+.\\d+)';
const router = new Router({
  prefix: `${baseUrl}/greetings`
});

router
.get('/', v({
  // Note that the order matters
  // Key: any range accepted by semver
  // value: any function
  '<1.x': ctx => ctx.body = 'hello', // if <1.x
  '^1.0.0': ctx => ctx.body = 'hola', // else if ^1.0.0
  // Matches any other valid version
  '*': ctx => ctx.body = 'hi'        // else
}));

const app = new Koa();
app
.use(router.allowedMethods({throw: true}))
.use(router.routes())
.listen(3000);

Behavior:

curl localhost:3000/v0.0.0/greetings // hello
curl localhost:3000/v1.0.0/greetings // hola
curl localhost:3000/v2.0.0/greetings // hi

Global version check

// ... some omitted setup code

const {versionChecker} = require('route-v')();

const vChecker = versionChecker((isSatisfied, {userVersion, predicate, range}) =>
  (ctx, next) => {
    if(!isSatisfied) {
      ctx.throw(400, `Version ${userVersion} is not ${predicate} range ${range}`);
    }
    return next();
  });

router
.use(vChecker('<5.x'));

exports.app = new Koa();
exports.app
.use(router.allowedMethods({throw: true}))
.use(router.routes())
.listen(3000);

Behavior:

curl localhost:3000/v6.0.0/greetings // Version 6.0.0 is not compliant with version <5.x

Config

Change extractor and path

If you want to use the header instead of the url.

const {valid} = require('semver');
// Points to the object "headers" from the first argument of your function (ctx in koa, req in express)
// and returns the value of the key x-api-version
const versionExtractor = ctxOrReq => valid(ctxOrReq.headers['x-api-version']);
const {v} = routeV({versionExtractor});

Add a custom versionNotFoundErrorHandler

By default, an error will be thrown if the version requested was not found.

// This is for Koa, for express, a similar middleware can be passed
const versionNotFoundErrorHandler = ctx => ctx.throw(400, 'Version not found');
const {v} = routeV({versionNotFoundErrorHandler});

Examples

Examples

Test

npm test

Known issues

Since the insertion order matters but it is not guaranteed for integers, the library assumes you know what you are doing when using integers as ranges. https://bugs.chromium.org/p/v8/issues/detail?id=164

Credits: Kudus to Avaq, his expertise have been extremely helpful.