swagger-parser

What is swagger-parser?

swagger-parser is a powerful npm package that allows you to parse, validate, and dereference Swagger (OpenAPI) definitions. It helps in ensuring that your API definitions are correct and can be used to resolve $ref pointers to simplify the API documentation.

What are swagger-parser's main functionalities?

Parse

This feature allows you to parse a Swagger (OpenAPI) definition file. The code sample demonstrates how to parse a Swagger file and log the API name and version.

const SwaggerParser = require('swagger-parser');

SwaggerParser.parse('path/to/your/swagger.yaml')
  .then(api => {
    console.log('API name: %s, Version: %s', api.info.title, api.info.version);
  })
  .catch(err => {
    console.error(err);
  });

Validate

This feature allows you to validate a Swagger (OpenAPI) definition file. The code sample demonstrates how to validate a Swagger file and log whether the API is valid or not.

const SwaggerParser = require('swagger-parser');

SwaggerParser.validate('path/to/your/swagger.yaml')
  .then(api => {
    console.log('API is valid:', api);
  })
  .catch(err => {
    console.error('API is invalid:', err);
  });

Dereference

This feature allows you to dereference $ref pointers in a Swagger (OpenAPI) definition file. The code sample demonstrates how to dereference a Swagger file and log the dereferenced API.

const SwaggerParser = require('swagger-parser');

SwaggerParser.dereference('path/to/your/swagger.yaml')
  .then(api => {
    console.log('Dereferenced API:', api);
  })
  .catch(err => {
    console.error(err);
  });

Bundle

This feature allows you to bundle all external $ref pointers into a single file. The code sample demonstrates how to bundle a Swagger file and log the bundled API.

const SwaggerParser = require('swagger-parser');

SwaggerParser.bundle('path/to/your/swagger.yaml')
  .then(api => {
    console.log('Bundled API:', api);
  })
  .catch(err => {
    console.error(err);
  });

Other packages similar to swagger-parser

openapi-schema-validator

openapi-schema-validator is a package that validates OpenAPI 3.0 schemas. It focuses on schema validation and does not provide parsing or dereferencing functionalities like swagger-parser.

swagger-jsdoc

swagger-jsdoc is a package that generates Swagger (OpenAPI) definitions from JSDoc comments in your code. It is more focused on generating documentation from code comments rather than parsing and validating existing Swagger files.

swagger-client

swagger-client is a package that provides a JavaScript client for interacting with Swagger (OpenAPI) APIs. It includes functionalities for making API requests and handling responses, but it does not focus on parsing or validating Swagger definitions.

README

Swagger 2.0 and OpenAPI 3.0 parser/validator

Features

• Parses Swagger specs in JSON or YAML format
• Validates against the Swagger 2.0 schema or OpenAPI 3.0 Schema
• Resolves all $ref pointers, including external files and URLs
• Can bundle all your Swagger files into a single file that only has internal $ref pointers
• Can dereference all $ref pointers, giving you a normal JavaScript object that's easy to work with
• Tested in Node.js and all modern web browsers on Mac, Windows, and Linux
• Tested on over 1,500 real-world APIs from Google, Instagram, Spotify, etc.
• Supports circular references, nested references, back-references, and cross-references
• Maintains object reference equality — $ref pointers to the same value always resolve to the same object instance

Related Projects

• Swagger CLI
• Swagger Express Middleware

Example

SwaggerParser.validate(myAPI, (err, api) => {
  if (err) {
    console.error(err);
  }
  else {
    console.log("API name: %s, Version: %s", api.info.title, api.info.version);
  }
});

Or use async/await or Promise syntax instead. The following example is the same as above:

try {
  let api = await SwaggerParser.validate(myAPI);
  console.log("API name: %s, Version: %s", api.info.title, api.info.version);
}
catch(err) {
  console.error(err);
}

For more detailed examples, please see the API Documentation

Installation

Install using npm:

npm install swagger-parser

Usage

When using Swagger Parser in Node.js apps, you'll probably want to use CommonJS syntax:

const SwaggerParser = require("swagger-parser");

When using a transpiler such as Babel or TypeScript, or a bundler such as Webpack or Rollup, you can use ECMAScript modules syntax instead:

import SwaggerParser from "swagger-parser";

Browser support

Swagger Parser supports recent versions of every major web browser. Older browsers may require Babel and/or polyfills.

To use Swagger Parser in a browser, you'll need to use a bundling tool such as Webpack, Rollup, Parcel, or Browserify. Some bundlers may require a bit of configuration, such as setting browser: true in rollup-plugin-resolve.

API Documentation

Full API documentation is available right here

Contributing

I welcome any contributions, enhancements, and bug-fixes. File an issue on GitHub and submit a pull request.

Building/Testing

To build/test the project locally on your computer:

1. Clone this repo
   git clone https://github.com/APIDevTools/swagger-parser.git

2. Install dependencies
   npm install

3. Run the build script
   npm run build

4. Run the tests
   npm test

License

Swagger Parser is 100% free and open-source, under the MIT license. Use it however you want.

Big Thanks To

Thanks to these awesome companies for their support of Open Source developers ❤