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2.6.0 • Public • Published

Swagger 2.0 and OpenAPI 3.x parser/validator

Build Status Tested on APIs.guru

npm License

OS and Browser Compatibility

Online Demo


  • Parses Swagger specs in JSON or YAML format
  • Validates against the Swagger 2.0 schema, OpenAPI 3.0 Schema, or OpenAPI 3.1 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, Microsoft, Facebook, 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


OpenAPIParser.validate(myAPI, (err, api) => {
  if (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 OpenAPIParser.validate(myAPI);
  console.log('API name: %s, Version: %s', api.info.title, api.info.version);
} catch (err) {

For more detailed examples, please see the API Documentation


Install using npm:

npm install @readme/openapi-parser


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

const OpenAPIParser = require('@readme/openapi-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 OpenAPIParser from '@readme/openapi-parser';

Differences from @apidevtools/swagger-parser

@apidevtools/swagger-parser returns schema validation errors as the raw error stack from Ajv. For example:

To reduce the amount of potentially unnecessary noise that these JSON pointer errors provide, @readme/openapi-parser utilizes better-ajv-errors, along with some intelligent reduction logic, to only surface the errors that actually matter.

Additionally with these error reporting differences, this library ships with a validation.colorizeErrors option that will disable colorization within these prettified errors.

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

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npm i @readme/openapi-parser

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