tsoa

Pronounced so·uh

OpenAPI-compliant REST APIs using TypeScript and Node

Goal

• TypeScript controllers and models as the single source of truth for your API
• A valid OpenAPI (formerly Swagger) spec (2.0 or 3.0 if you choose 😍) is generated from your controllers and models, including:
  • Paths (e.g. GET /users)
  • Definitions based on TypeScript interfaces (models)
  • Parameters/model properties marked as required or optional based on TypeScript (e.g. myProperty?: string is optional in the OpenAPI spec)
  • jsDoc supported for object descriptions (most other metadata can be inferred from TypeScript types)
• Routes are generated for middleware of choice
  • Express, Hapi, and Koa currently supported, other middleware can be supported using a simple handlebars template
  • Validate request payloads

Philosophy

• Rely on TypeScript type annotations to generate API metadata if possible
• If regular type annotations aren't an appropriate way to express metadata, use decorators
• Use jsdoc for pure text metadata (e.g. endpoint descriptions)
• Minimize boilerplate
• Models are best represented by interfaces (pure data structures), but can also be represented by classes
• Runtime validation of tsoa should behave as closely as possible to the specifications that the generated OpenAPI 2/3 schema describes. Any differences in validation logic are clarified by logging warnings during the generation of the OpenAPI Specification (OAS) and/or the routes.
  • Please note that by enabling OpenAPI 3 you minimize the chances of divergent validation logic since OpenAPI 3 has a more expressive schema syntax.

Getting Started

• Documentation
• API Reference
• Getting started guide

Examples

Check out the guides

See example controllers in the tests

See example models in the tests

Help wanted

Contributing code

To contribute (via a PR), please first see the Contributing Guide

Becoming a maintainer

tsoa wants additional maintainers! The library has increased in popularity and has quite a lot of pull requests and issues. Please post in this issue if you're willing to take on the role of a maintainer.