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Swagger JS library

This is the Wordnik Swagger javascript client for use with swagger enabled APIs. It's written in CoffeeScript and tested with Jasmine, and is the fastest way to enable a javascript client to communicate with a swagger-enabled server.

What's Swagger?

The goal of Swagger™ is to define a standard, language-agnostic interface to REST APIs which allows both humans and computers to discover and understand the capabilities of the service without access to source code, documentation, or through network traffic inspection. When properly defined via Swagger, a consumer can understand and interact with the remote service with a minimal amount of implementation logic. Similar to what interfaces have done for lower-level programming, Swager removes the guesswork in calling the service.

Check out Swagger-Spec for additional information about the Swagger project, including additional libraries with support for other languages and more.


The Swagger Specification has undergone 3 revisions since initial creation in 2010. The swagger-ui project has the following compatibilies with the swagger specification:

Swagger UI Version Release Date Swagger Spec compatability Notes
2.1.0 (in development) n/a 2.0 branch develop_2.0
2.0.40 2014-09-18 1.1, 1.2 tag v2.0.40
1.0.13 2013-03-08 1.0, 1.1 tag v1.0.4

Calling an API with swagger + node.js!

Install swagger-client:

npm install swagger-client

Then let swagger do the work!

var client = require("swagger-client")

var swagger = new client.SwaggerApi({
  url: '',
  success: function() {
    if(swagger.ready === true) {{petId:1});

That's it! You'll get a JSON response with the default callback handler:

  "id": 1,
  "category": {
    "id": 2,
    "name": "Cats"
  "name": "Cat 1",
  "photoUrls": [
  "tags": [
      "id": 1,
      "name": "tag1"
      "id": 2,
      "name": "tag2"
  "status": "available"

Need to pass an API key? Configure one as a querystring:

client.authorizations.add("apiKey", new client.ApiKeyAuthorization("api_key","special-key","query"));

...or with a header:

client.authorizations.add("apiKey", new client.ApiKeyAuthorization("api_key","special-key","header"));

Calling an API with swagger + the browser!

Download swagger.js and shred.bundle.js into your lib folder

<script src='lib/shred.bundle.js' type='text/javascript'></script>
<script src='lib/swagger.js' type='text/javascript'></script>
<script type="text/javascript">
  // initialize swagger, point to a resource listing
  window.swagger = new SwaggerApi({
    url: "",
    success: function() {
      if(swagger.ready === true) {
        // upon connect, fetch a pet and set contents to element "mydata"{petId:1}, function(data) {
          document.getElementById("mydata").innerHTML =;


Need to send an object to your API via POST or PUT?

var body = {
  id: 100,
  name: "dog"};{body: JSON.stringify(body)});

Sending XML in as a payload to your API?

var body = "<Pet><id>2</id><name>monster</name></Pet>";{body: body},{requestContentType:"application/xml"});

Need XML response?{petId:1},{responseContentType:"application/xml"});

Custom request signing

You can easily write your own request signing code for Swagger. For example:

var CustomRequestSigner = function(name) { = name; 

CustomRequestSigner.prototype.apply = function(obj, authorizations) { 
  var hashFunction = this._btoa; 
  var hash = hashFunction(obj.url); 

  obj.headers["signature"] = hash; 
  return true; 

In the above simple example, we're creating a new request signer that simply base 64 encodes the URL. Of course you'd do something more sophisticated, but after encoding it, a header called signature is set before sending the request.

How does it work?

The swagger javascript client reads the swagger api definition directly from the server. As it does, it constructs a client based on the api definition, which means it is completely dynamic. It even reads the api text descriptions (which are intended for humans!) and provides help if you need it:
'* petId (required) - ID of pet that needs to be fetched'

The HTTP requests themselves are handled by the excellent shred library, which has a ton of features itself. But it runs on both node and the browser.


Please fork the code and help us improve swagger.js. Send us a pull request and we'll mail you a wordnik T-shirt!

Swagger.js is written in CoffeeScript, so you'll need Node.js and the CoffeeScript compiler. For more detailed installation instructions, see

# generate the javascript libraries and put them in the `lib` folder

npm run-script build
# The 'dev' task will:
# 1. Open source files in your $EDITOR
# 2. Open and run the Jasmine specs in your browser.
# 3. Watch for changes to CoffeeScript files and auto-compile them to Javascript.

npm run-script dev

# List all cake tasks:


Copyright 2011-2014 Wordnik, Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.


Javascript library to connect to swagger-enabled APIs via browser or nodejs




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