lambda-expressless

Wrap AWS Lambda functions with Express-like functions to simplify your code

So instead of writing this:

exports.handler = (event, context, callback) => {
  const requestBody = JSON.parse(event.body);
  const responseBody = {
    success: false,
    data: requestBody.id
  };

  callback(null, {
    statusCode: 201,
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify(responseBody)
  });
}

you'll have this:

const { use } = require('lambda-expressless');
const bodyParser = require('body-parser');

exports.handler = use(bodyParser.json(), (req, res) => {
  res.status(201).json({
    success: false,
    data: req.body.id
  })
});

You can also use multiple middlewares for a single handler:

const { use } = require('lambda-expressless');

const checkUser = (req, res, next) => {
  if (req.get('Authorization') === 'someToken') {
    next()
  } else {
    req.status(403).end('Forbidden');
  }
};

const getUser = (req, res) => {
  res.json({
    id: '12',
    name: 'Murat'
  });
};

exports.handler = use(checkUser, getUser);

TypeScript example:

import { use, Request, Response } from 'lambda-expressless';
import * as bodyParser from "body-parser";

const addUser = (req: Request, res: Response, next: Function) => {
  UserService.add(req.body);

  // add user
  res.json({success: true});
};

export const handler = use(
  bodyParser.json(),
  addUser
);

You can use many popular Express Middlewares. Some tested examples are:

• body-parser

Installation

npm i lambda-expressless

Supported Features and Limitations

This project aims to implement functionalities of ExpressJS middlewares as much as possible. Request and Response objects have properties and methods listed below.

Request Object

Properties:

| Property | Notes | |-------------|-------| | body | You need to use body-parser | | hostname | - | | host | - | | xhr | - | | ip | - | | ips | - | | path | - | | protocol | - | | secure | - | | method | - | | query | - | | params | - | | headers | - |

Methods:

| Method | Notes | |-------------|-------| | accepts() | - | | acceptsEncodings() | - | | acceptsCharsets() | - | | acceptsLanguages() | - | | get() | - | | header() | - | | is() | - |

Response Object

Methods:

| Method | Notes | |-------------|-------| | get() | - | | format() | Doesn't support shorthand mime-types | | set() | Only supports key, value parameters | | send() | Only supports string values | | status() | - | | end() | - | | json() | - | | type() | - |

Contribution

Every contribution is very welcome. Keep these in your mind when you want to make a contribution:

1. Because of we use semantic-release you need to use Angular Commit Message Conventions in your commit messages.
2. Keep code coverage 100% with your updated tests.
3. Check your changes with a Lambda environment. You can use SAM-CLI to test on your local.
4. Don't forget to update documentation(this readme file) about your changes.