openapi-backend

import OpenAPIBackend from 'openapi-backend'; import express from 'express'; // In a real application, './petstore.yml' would be your OpenAPI definition file. // For demonstration, we'll use a minimal inline definition. const api = new OpenAPIBackend({ definition: { openapi: '3.0.0', info: { title: 'Petstore API', version: '1.0.0' }, paths: { '/pets': { get: { operationId: 'getPets', responses: { 200: { description: 'A list of pets' } }, }, }, '/pets/{petId}': { get: { operationId: 'getPetById', parameters: [ { name: 'petId', in: 'path', required: true, schema: { type: 'string' } }, ], responses: { 200: { description: 'A single pet' } }, }, }, }, }, }); // register your framework specific request handlers here api.register({ getPets: (c, req, res) => res.status(200).json({ result: 'all pets' }), getPetById: (c, req, res) => res.status(200).json({ result: `pet with id ${c.request.params.petId}` }), validationFail: (c, req, res) => res.status(400).json({ err: c.validation.errors }), notFound: (c, req, res) => res.status(404).json({ err: 'not found' }), }); // initalize the backend api.init(); const app = express(); app.use(express.json()); // Enable JSON body parsing // Connect openapi-backend to your Express application app.use((req, res) => api.handleRequest(req, req, res)); const PORT = process.env.PORT ?? 9000; app.listen(PORT, () => { console.log(`Server running on http://localhost:${PORT}`); console.log('Try visiting: http://localhost:9000/pets'); console.log('Try visiting: http://localhost:9000/pets/123'); });