Skip to content

Latest commit



64 lines (46 loc) · 2.44 KB

File metadata and controls

64 lines (46 loc) · 2.44 KB

OpenAPI Data Validator

Lightweight OpenAPI complete request model validator. Fast, unopinionated, full featured validator for API requests that utilize OpenAPI docs for API documentation.

This is an open source project managed by the Authress Engineering team.

Authress Engineering npm version


It is simple, and that's all there is to it!

npm install openapi-data-validator --save
const { OpenApiValidator } = require('openapi-data-validator');
const spec = require('./openapi.json');

const openApiValidator = new OpenApiValidator({ apiSpec: spec });
const validator = openApiValidator.createValidator();

// Configure this to the client's request. It will resolve the expected schema in the spec using the method and route defined, and validate the request parameters.
const newRequest = {
  method: 'GET',
  // Matched openapi specification generic route, this should be the generic `path` from the spec, such as `/resources/{resourceId}/`, it must match one of them exactly.
  route: request.route

  headers: { Authorization: 'Bearer Token' },
  // Query string parameters from the request
  query: { limit: 10 },
  // Body already parsed to JSON
  body: { field: true },

  // Path parameters
  path: { user: 'userId' }
await validator(newRequest);

Compile validator

For improved processing speed the validator can be pre-compiled from the spec

const openApiValidator = new OpenApiValidator({ apiSpec: spec, compiledFilePath: './compiledValidator.json' });
await openApiValidator.compileValidator();
// Later
const validator = await openApiValidator.loadValidation();

// ...
await validator(request);

Checkout the full: Async example


Why not just use AJV

AJV is the best, but there are some things that just are very OpenAPI specific that don't make sense to be in the validator. Don't need them? Great, go use AJV.

  • Top level defined Path parameters - AJV doesn't understand
  • Inline request body definitions, AJV doesn't understand schema defined in the method, it has to be in a component
  • Body Content-Type validation - Request bodies with multiple content types allowed