cdimascio/express-openapi-validator
Express Openapi Validator
Express-openapi-validator is an ExpressJS middleware that enforces API contract compliance by validating incoming requests and outgoing responses against OpenAPI 3.0 and 3.1 specifications. It acts as a gatekeeper for web services, ensuring that all traffic adheres to defined schemas before reaching application logic.
The framework distinguishes itself by automating data integrity tasks, including the automatic coercion of request parameters and body content into typed objects. It provides comprehensive security enforcement by validating authentication and authorization headers against defined security schemes, and it supports complex API structures through automatic schema reference resolution and dereferencing.
Beyond core validation, the tool manages the full request lifecycle by handling multipart file uploads, mapping API paths to specific handlers, and providing structured error formatting for schema violations. Developers can extend the framework's capabilities by registering custom validation logic for unique data types or by configuring the strictness of format checks to suit specific project requirements.
Features
- Request Interception Middleware - Acts as an ExpressJS middleware that intercepts incoming HTTP traffic for schema validation and data coercion.
- ExpressJS Request Validators - Provides ExpressJS middleware that enforces API contract compliance by validating request parameters, headers, and bodies against defined schemas.
- Data Type Coercion - Applies automatic type casting and formatting rules defined in the API specification to incoming request inputs.
- Runtime Contract Enforcement - Enforces API contracts by verifying that request and response traffic matches the defined specification.
