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swagger-codegen contains a template-driven engine to generate client code in different languages by parsing your Swagger Resource Declaration.
HTML Java Scala Shell Objective-C Python Other

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Swagger Code Generator

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This is the swagger codegen project, which allows generation of client libraries automatically from a Swagger-compliant 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, Swagger 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-codegen project has the following compatibilities with the swagger specification:

Swagger Codegen Version Release Date Swagger Spec compatibility Notes
2.1.2-M1 (master) 2015-02-23 1.0, 1.1, 1.2, 2.0 tag v2.1.0-M1
2.0.17 2014-08-22 1.1, 1.2 tag v2.0.17
1.0.4 2012-04-12 1.0, 1.1 tag v1.0.4


You need the following installed and available in your $PATH:

After cloning the project, you can build it from source with this command:

mvn package

To generate a sample client library

You can build a client against the swagger sample petstore API as follows:


This will run the generator with this command:

java -jar modules/swagger-codegen-distribution/target/swagger-codegen-distribution-2.1.2-M1.jar \
  -i \
  -l java \
  -o samples/client/petstore/java

With a number of options. You can get the options with the -h flag:

usage: Codegen
 -a,--auth                 addes authorization headers when fetching the
                           swagger definitions remotely. Pass in a
                           URL-encoded string of name:header with a comma
                           separating multiple values
 -d,--debug-info           prints additional info for debugging
 -h,--help                 shows this message
 -i,--input-spec <arg>     location of the swagger spec, as URL or file
 -l,--lang <arg>           client language to generate.
                           Available languages include:
                           [android, java, jaxrs, nodejs, objc, scalatra,
                           scala, dynamic-html, html, swagger, tizen, php,
 -o,--output <arg>         where to write the generated files
 -t,--template-dir <arg>   folder containing the template files

You can then compile and run the client, as well as unit tests against it:

cd samples/client/petstore/java
mvn package

Other languages have petstore samples, too:


Generating libraries from your server

It's just as easy--just use the -i flag to point to either a server or file.

Modifying the client library format

Don't like the default swagger client syntax? Want a different language supported? No problem! Swagger codegen processes mustache templates with the jmustache engine. You can modify our templates or make your own.

You can look at modules/swagger-codegen/src/main/resources/${your-language} for examples. To make your own templates, create your own files and use the -t flag to specify your tempalte folder. It actually is that easy.

Where is Javascript???

See our javascript library--it's completely dynamic and doesn't require static code generation. There is a third-party component called swagger-js-codegen that can generate angularjs or nodejs source code from a swagger specification.

Generating a client from flat files (i.e. no remote server calls)

If you don't want to call your server, you can save the swagger spec files into a directory and pass an argument to the code generator like this:

-i ./modules/swagger-codegen/src/test/resources/2_0/petstore.json

Great for creating libraries on your ci server, from the Swagger Editor... or while coding on an airplane.

Customizing the generator

There are different aspects of customizing the code generator beyond just creating or modifying templates. Each language has a supporting configuration file to handle different type mappings, etc:

$ ls -1 modules/swagger-codegen/src/main/java/com/wordnik/swagger/codegen/languages/

Each of these files creates reasonable defaults so you can get running quickly. But if you want to configure package names, prefixes, model folders, etc., you may want to extend these.

To change, for example, the prefix for the Objective-C generated files, simply subclass the

package com.mycompany.swagger.codegen;

import com.wordnik.swagger.codegen.languages.*;

public class MyObjcCodegen extends ObjcClientCodegen {
  static {
    PREFIX = "HELO";

and specify the classname when running the generator:

-l com.mycompany.swagger.codegen.MyObjcCodegen

Your subclass will now be loaded and overrides the PREFIX value in the superclass.

Validating your swagger spec

You have options. The easiest is to use our online validator which not only will let you validate your spec, but with the debug flag, you can see what's wrong with your spec. For example:

Generating dynamic html api documentation

To do so, just use the -l dynamic-html flag when reading a spec file. This creates HTML documentation that is available as a single-page application with AJAX. To view the documentation:

cd samples/dynamic-html/
npm install
node .

Which launches a node.js server so the AJAX calls have a place to go.

Generating static html api documentation

To do so, just use the -l html flag when reading a spec file. This creates a single, simple HTML file with embedded css so you can ship it as an email attachment, or load it from your filesystem:

cd samples/html/
open index.html

To build a server stub

You can also use the codegen to generate a server for a couple different frameworks. Take a look here:


java -jar modules/swagger-codegen-distribution/target/swagger-codegen-distribution-2.1.2-M1.jar \
  -i \
  -l nodejs \
  -o samples/server/petstore/nodejs


Not yet migrated to this branch

scala scalatra

java -jar modules/swagger-codegen-distribution/target/swagger-codegen-distribution-2.1.2-M1.jar \
  -i \
  -l scalatra \
  -o samples/server/petstore/scalatra

java jax-rs

java -jar modules/swagger-codegen-distribution/target/swagger-codegen-distribution-2.1.2-M1.jar \
  -i \
  -l jaxrs \
  -o samples/server/petstore/jaxrs

To build the codegen library

This will create the swagger-codegen library from source.

mvn package

Note! The templates are included in the library generated. If you want to modify the templates, you'll need to either repackage the library OR specify a path to your scripts


Copyright 2015 Reverb Technologies, 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.

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