✈️ Express Marshal

A suite of decorators built to wire up express controllers

Install

$ npm install express express-marshal

Make sure you have decorators enabled through babel:

$ npm install --save-dev @babel/plugin-proposal-decorators

Add the plugin to your .babelrc:

{
  "plugins": [
    ["@babel/plugin-proposal-decorators", { "legacy": true }]
  ]
}

Example

 
import express, { Router } from 'express'
import { mount, controller, param, validate, get, post } from 'express-marshal';
import Joi from 'joi';
 
@controller('/users')
class UserController {
 
  // Add route parameters
  @param('id')
  preloadUser(req, res, next, id) {
    const user = UserService.find({ id });
 
    if (!user) {
      res.sendStatus(404);
      return;
    }
 
    req.user = user;
    next();
  }
 
  // Add route-specific middleware
  @get('/', [authenticator])
  getUsers(req, res) {
    res.json({ users: [] });
  }
 
  // Use the previously specified param
  @get('/:id')
  getUser(req, res) {
    res.json({
      user: req.user
    });
  }
 
  // Validate user paylaods with Joi
  @validate({
    email: Joi.string().required(),
    password: Joi.string().required()
  })
  @post('/')
  createUser(req, res) {
    res.json({ users: [] });
  }
}
 
const app = express()
const router = new Router();
mount(router, [UserController]);
app.use(router);
app.listen(process.env.PORT || 3000);

API

mount(router, [controllers])

• #### router: Express#Router

  An Express router

• #### controllers: Array

  Array of decorated controllers

import express, { Router } from 'express';
import { mount } from 'express-marshal';
 
const app = express()
const router = new Router();
mount(router, [UserController]);
app.use(router);
app.listen(3000);

---

@controller(basepath, middleware)

• ##### basepath: String

  The basepath will be prepended to all controller routes

• ##### middleware: Array optional

  Middleware to be run for every route on the controller

import { controller, get } from 'express-marshal';
 
@controller('/example')
export default class ExampleController {
  ...
}

---

@route(method, path, middleware)

• ##### method: String

  The desired HTTP method (get, post, etc.)

• ##### path: String

  The endpoint to be appended to the parent controller's basepath

• ##### middleware: Array optional

  Array of middleware only to be run for this route

Route Aliases

• @get(path, middleware)
• @post(path, middleware)
• @put(path, middleware)
• @patch(path, middleware)
• @delete(path, middleware)

These are less verbose aliases for @route(method, path) so you can use @get('/revoke') instead of @route('get', '/revoke').

import { controller, get } from 'express-marshal';
 
@controller('/docs')
export default class DocsController {
  @get('/')
  index() {
    ...
  }
}

---

@validate(schema)

• ##### schema: Object|Joi

  A generic object containing Joi properties or a preconfigured Joi schema to validate an incoming payload against. A generic object will be converted to a Joi schema upon validation. A GET request will validate the req.query object while a POST request will validate the req.query object. Returns a 400 along with the Joi error if payload is invalid.

import { controller, validate, post } from 'express-marshal';
import Joi from 'joi';
 
@controller('/users')
export default class UsersController {
  @validate({
    username: Joi.string().required()
  })
  @post('/')
  createUser() {
    ...
  }
}

Inspiration

• https://github.com/stewartml/express-decorators
• https://github.com/knownasilya/hapi-decorators
• https://github.com/serhiisol/node-decorators/tree/master/express

License

MIT © Kyle Alwyn