OpenAPI Template

This is a Cloudflare Worker with OpenAPI 3.1 Auto Generation and Validation using chanfana and Hono.

This is an example project made to be used as a quick start into building OpenAPI compliant Workers that generates the openapi.json schema automatically from code and validates the incoming request to the defined parameters or request body.

This template includes various endpoints, a D1 database, and integration tests using Vitest as examples. In endpoints, you will find chanfana D1 AutoEndpoints and a normal endpoint to serve as examples for your projects.

Besides being able to see the OpenAPI schema (openapi.json) in the browser, you can also extract the schema locally no hassle by running this command npm run schema.

🤖 Model Context Protocol (MCP) Integration

This template now includes a Model Context Protocol (MCP) server that exposes all API endpoints as tools that AI agents can use! This enables AI assistants like Claude, ChatGPT, and other AI agents to interact with your API programmatically through a standardized protocol.

Quick start:

npm run mcp

For detailed setup instructions, integration guides, and usage examples, see MCP Integration Documentation.

Important

When using C3 to create this project, select "no" when it asks if you want to deploy. You need to follow this project's setup steps before deploying.

Getting Started

Outside of this repo, you can start a new project with this template using C3 (the create-cloudflare CLI):

npm create cloudflare@latest -- --template=cloudflare/templates/openapi-template

A live public deployment of this template is available at https://openapi-template.templates.workers.dev

Setup Steps

1. Install the project dependencies with a package manager of your choice:

   npm install

2. Create a D1 database with the name "openapi-template-db":

   npx wrangler d1 create openapi-template-db

   ...and update the database_id field in wrangler.json with the new database ID.
3. Run the following db migration to initialize the database (notice the migrations directory in this project):

   npx wrangler d1 migrations apply DB --remote

4. Deploy the project!

   npx wrangler deploy

5. Monitor your worker

   npx wrangler tail

Testing

This template includes integration tests using Vitest. To run the tests locally:

npm run test

Test files are located in the tests/ directory, with examples demonstrating how to test your endpoints and database interactions.

Project structure

1. Your main router is defined in src/index.ts.
2. Each endpoint has its own file in src/endpoints/.
3. The MCP server is defined in src/endpoints/mcp.ts.
4. Integration tests are located in the tests/ directory.
5. For more information read the chanfana documentation, Hono documentation, Vitest documentation, and MCP documentation.