Hally

JavaScript module for performing HTTP GET en PUT requests for JSON HAL resources.

Its main use is to embed linked resources, even when the server returns only the links.

Example

var hally = require('hally');
var halJson = hally.halJson;
var stateBody = hally.stateBody

var opts = {headers: {'Accept': 'application/hal+json'}};
var embeds = {car: {}, friends: {car: {}}};
fetch('https://example.com/user1', opts).then(halJson(opts, embeds)).then(function (user) {
  console.log("User name: " + user.name);

  var car = user._embedded.car;
  console.log("Car brand: " + car.brand);

  user._embedded.friends.forEach(function (friend) {
    console.log(friend.name + "'s car brand: " + friend._embedded.car.brand);
  });

  car.brand = 'Ford';
  var putOpts = {method: 'PUT', headers: {'Content-Type': 'applications/json'}, body: stateBody(car)};
  return fetch(car._links.self.href, putOpts).then(function (response) {
    // Do something with PUT response
  });
});

Installation

Install using NPM:

npm install hally --save

Hally uses the WHATWG Fetch API to make HTTP requests. It is available on modern browsers. For older browsers a polyfill is available. Alternatively, and on Node.js, use the isomorphic-fetch polyfill:

npm install isomorphic-fetch --save

You also need a Promise implementation. Promises are available on most modern platforms, but older environments may require a polyfill:

npm install promise-polyfill --save