express-api-loader

Enhance API writing experience in declarative way with Express.js.

We'd like to provide a new way as below:

/**
 * @method get
 * @api /users/:id
 */
module.exports.getUsers = function(req, res) {
  const { url, originalUrl, params } = req

  res.json({
    url,
    originalUrl,
    id: params.id
  })
}

It's declarative, all you need for API writing is giving a proper annotation, @method - for http method definition; @api - for API path. And nothing else.

You don't have to worry about how router organized any more.

Install

yarn

yarn add express-api-loader

npm

npm install --save express-api-loader

Import

const { withExpressApp } = require('express-api-loader')

Quick Start

Let's say you have apis/users/user.js as below:

/**
 * @method get
 * @api /users/:id
 */
module.exports.getUsers = async function(req, res) {
  const { url, originalUrl, params } = req

  res.json({
    url,
    originalUrl,
    id: params.id
  })
}

How can we get it up and running as APIs? see:

const express = require('express')
const { resolve } = require('path')
const { withExpressApp } = require('express-api-loader')

// create express app as usual
const app = express()

// scan API files and register as routers automatically
withExpressApp(app)({
  scanOpts: {
    cwd: resolve(__dirname, 'apis'), // where to start scanning
    pattern: '**/*.js', // which file will be loaded as API declaration
    ignore: ['**/_*.js'] // which file will be ignored from scanning
  },
  apiPrefix: '/apis' // will be prepended in every api path
})

app.listen(9876, () => {
  console.log('server running at 9876')
})

try

curl http://localhost:9876/apis/users/123?name=hello

to see the result.

Methods

withCors(app: express.Express)

Enable Cross-Origin Resource Sharing

withExpressApp(app: express.Express)

Setup scan options for API initialization

withLogger(opts)

Provide specific logger implementation. console.log/warn/error is used by default

withRequestHandler(app: express.Express, customHandler: (function(bodyParser): any))

Setup request middlewares as needed. app.use(bodyParser.json()) by default

withResponseHandler(opts: {onNormalResponse: function, onErrorResponse: function})

Setup response transformer for normal/error case individually while fast return {value} with @api

Properties

logger

Log information

ResponseError

You have to use this custom error implementation while throwing error within @api

LICENSE

MIT License