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express-async-router

express-async-router is an Express Router wrapper which automatically manage Promise.

Getting Started

express-async-router works exactly as Express Router. If you're not family with Express Router API, please see Router documentation.

Installation

express-async-router can be installed using NPM:

$ npm install express-async-router --save

Usage

First import express-async-router in your project:

var AsyncRouter = require("express-async-router").AsyncRouter;

Then instanciate AsyncRouter:

var router = AsyncRouter();

You're ready to use AsyncRouter the same way as Express Router but without worrying about Promise.

router.get("/", function (req, res) {
	return myGetOperation()
		.then(myOtherOperation);
});

router.post("/:test", function (req, res) {
	return myParametrizedOperation(req.params.test)
		.then(myOtherOperation);
});

router.use(function (req, res) {
	return myMiddlewareOperation()
		.then(myOtherOperation);
});

Options

express-async-router works exactly as Express Router so it can take the same options plus some additionnals to manage how request is sent.

By default, express-async-router sends the Promise result by using res.send(result) if headers was not already sent. You can customize this behavior by passing sender option when creating AsyncRouter.

options.send

Type: boolean | Default: true

If set to false, AsyncRouter will never try to send Promise result.

options.sender

Type: (req, res, value) => Thenable | Default: function (req, res, value) { res.send(value); }

If set, it will override the default AsyncRouter sender function.

Examples:

var router = AsyncRouter({ send: false });

Or

var router = AsyncRouter({ sender: mySender });

function mySender(req, res, value) { 
	res.rend(value.template, value.data); 
}

router.get("/", function () {
	return myOperation().then(function (data) {
		return {
			template: "index",
			data: data
		};
	});
});

send

Promise handling

express-async-router automatically handles Promises when it can.

param(name: string, handler: (req, res, param) => Thenable)

A special Router.param override which automatically calls next function when returned Promise resolves. If returned Promise rejects, rejected Error is transfered to next function. If result is not a Promise, next function is immediatelly called.

Example:

router.param("test", function (req, res, param) {
	return getTestEntity(param)
		.then(function(entity) {
			req.test = entity;
		});
});

[method](name: string, handler: (req, res) => Thenable)

A Router[method] wrapper which automatically calls next function when returned Promise resolves. If returned Promise rejects, rejected Error is transfered to next function. If result is not a Promise, next function is immediatelly called.

Examples:

router.get("/", function () {
	return getTestEntities();
});

router.post("/:test", function (req) {
	return getTestEntity(req.params.test);
});

use(...handlers[]: (req, res) => Thenable)

use(name: string | RegExp | string[], ...handlers[]: (req, res) => Thenable)

A Router.use wrapper which automatically calls next function when returned Promise resolves. If returned Promise rejects, rejected Error is transfered to next function. If result is not a Promise, next function is immediatelly called.

NOTE: If you declare 3 arguments in your function, next will only be called when an error occured.

Examples:

router.use(function (req) {
	return validateToken(req.header("MyCustomToken"))
		.then(function (user) {
			req.user = user;
		});
});

router.use("/test", function (req) {
	return validateToken(req.header("MyCustomToken"))
		.then(function (user) {
			req.user = user;
		});
});

router.use(myCustomAuth, serveStatic(__dirname + "/public"), function (req) {
	return logToServer(req)
		.then(function () {
			console.log(req);
		});
});

use(...handlers[]: (err, req, res, next) => Thenable)

use(name: string | RegExp | string[], ...handlers[]: (err, req, res, next) => Thenable)

A Router.use wrapper for Error handling which automatically calls next function when returned Promise resolves. If returned Promise rejects, rejected Error is transfered to next function. If result is not a Promise, next function is immediatelly called.

WARNING: You must declare the 4 arguments to your function to be recognized as an Error handler. This is for compatibility with Native Middlewares.

Examples:

router.use(function (err, req, res, next) {
	return logError(err)
		.then(function () {
			console.error(err);
			res.send(500, "An error occured!");
		});
});

router.use("/test", function (err, req, res, next) {
	return logError(err)
		.then(function () {
			console.error(err);
			res.send(500, "An error occured!");
		});
});

router.use(function (err, req, res, next) {
	return logError(err)
		.then(function () {
			console.error(err);
			res.send(500, "An error occured!");
		});
});

Contribute

Install Global Dependencies

express-router-async needs some development dependencies:

$ npm install -g grunt-cli tsd

Install Project dependencies

$ npm install

Build project

$ grunt

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Express Async Router - An Express Router wrapper which automatically manage Promise.

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