### Install and Start Express API

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/express/README.md

Installs dependencies and starts the Express API server. The API will be accessible at http://localhost:9000.

```bash
npm install
npm start
```

--------------------------------

### Install and Start OpenAPI Backend

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/aws-sam/README.md

Install project dependencies and start the API locally. The API will be accessible at http://localhost:3000.

```bash
npm install
npm start # API running at http://localhost:3000
```

--------------------------------

### Install Dependencies and Start Development Server

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/aws-sst/README.md

Use these commands to install project dependencies and start the SST development server. The latter will provide a URL for your deployed API.

```bash
pnpm i
pnpm sst dev
```

--------------------------------

### Install and Start Azure Functions Project

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/azure-function/README.md

Installs project dependencies and starts the Azure Functions API locally. The API will be accessible at http://localhost:9000.

```bash
npm install
npm start # API running at http://localhost:9000
```

--------------------------------

### Install and Run Express API

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/express-typescript/README.md

Install project dependencies and start the development server. The API will be accessible at http://localhost:9000.

```bash
npm install
npm run dev
```

--------------------------------

### Install OpenAPI Backend

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Install the openapi-backend package using npm.

```bash
npm install --save openapi-backend
```

--------------------------------

### Deploy AWS CDK Stack

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/aws-cdk/README.md

Deploy the example project to your AWS account. Ensure your AWS profile is correctly configured.

```bash
AWS_PROFILE=your-profile npx cdk deploy
```

--------------------------------

### OpenAPI Specification with Examples and Schema

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Define API paths and components in your OpenAPI specification. Use 'example' objects for direct mock data or 'schema' with 'example' for JSON Schema-based mock generation.

```yaml
paths:
  '/pets':
    get:
      operationId: getPets
      summary: List pets
      responses:
        200:
          $ref: '#/components/responses/PetListWithExample'
  '/pets/{id}':
    get:
      operationId: getPetById
      summary: Get pet by its id
      responses:
        200:
          $ref: '#/components/responses/PetResponseWithSchema'
components:
  responses:
    PetListWithExample:
      description: List of pets
      content:
        'application/json':
          example:
            - id: 1
              name: Garfield
            - id: 2
              name: Odie
    PetResponseWithSchema:
      description: A single pet
      content:
        'application/json':
          schema:
            type: object
            properties:
              id:
                type: integer
                minimum: 1
              name:
                type: string
                example: Garfield
```

--------------------------------

### Install Dependencies with Bun

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/bun/README.md

Use this command to install all necessary project dependencies using the Bun package manager.

```bash
bun install
```

--------------------------------

### Interact with Mock API Endpoints

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/express-ts-mock/README.md

Examples of using curl to test different endpoints of the mock API, including GET and POST requests.

```bash
curl -i http://localhost:9000/pets
curl -i http://localhost:9000/pets/1
curl -i -X POST -d {} http://localhost:9000/pets
```

--------------------------------

### Destroy AWS CDK Resources

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/aws-cdk/README.md

Remove the example resources from your AWS account. This command will prompt for confirmation.

```bash
AWS_PROFILE=your-profile npx cdk destroy
```

--------------------------------

### Koa Integration

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Integrate with Koa using middleware. This example includes `koa-bodyparser` for handling request bodies.

```javascript
import Koa from 'koa';
import bodyparser from 'koa-bodyparser';

const app = new Koa();

app.use(bodyparser());
app.use((ctx) =>
  api.handleRequest(
    ctx.request,
    ctx,
  ),
);
app.listen(9000);
```

--------------------------------

### Register Post Response Handler for Header Validation

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Register a postResponseHandler to validate response headers against the OpenAPI schema. This example uses 'exact' matching for status codes and headers.

```javascript
api.register({
  getPets: (c) => {
    // when a postResponseHandler is registered, your operation handlers' return value gets passed to context.response
    return [{ id: 1, name: 'Garfield' }];
  },
  postResponseHandler: (c, req, res) => {
    const valid = c.api.validateResponseHeaders(res.headers, c.operation, {
      statusCode: res.statusCode,
      setMatchType: 'exact',
    });
    if (valid.errors) {
      // response validation failed
      return res.status(502).json({ status: 502, err: valid.errors });
    }
    return res.status(200).json(c.response);
  },
});
```

--------------------------------

### Register Unauthorized Handler

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Register a custom handler to manage responses for unauthorized requests. This example returns a 401 status with a JSON error message.

```javascript
api.register('unauthorizedHandler', (c, req, res) => {
  return res.status(401).json({ err: 'unauthorized' })
});
```

--------------------------------

### Generate Mock Responses for Operations

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Use `mockResponseForOperation()` to retrieve mock data for a given operation ID. The function returns an object containing the HTTP status and the mock data, which can be generated from OpenAPI examples or schemas.

```javascript
api.mockResponseForOperation('getPets'); // => { status: 200, mock: [{ id: 1, name: 'Garfield' }, { id: 2, name: 'Odie' }]}
```

```javascript
api.mockResponseForOperation('getPetById'); // => { status: 200, mock: { id: 1, name: 'Garfield' }}
```

--------------------------------

### Run the Project with Bun

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/bun/README.md

Execute the main project file (index.ts) using the Bun runtime.

```bash
bun run index.ts
```

--------------------------------

### Bootstrap AWS CDK

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/aws-cdk/README.md

Bootstrap your AWS account and region for CDK deployment. Replace YOUR_ACCOUNT_ID and YOUR_DEFAULT_REGION with your specific values.

```bash
AWS_PROFILE=your-profile npx cdk bootstrap aws://YOUR_ACCOUNT_ID/YOUR_DEFAULT_REGION
```

--------------------------------

### Initialize OpenAPI Backend

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Create and initialize an OpenAPIBackend instance with your OpenAPI definition. Register handlers for operations and error cases like validation failures and not found routes.

```javascript
import OpenAPIBackend from 'openapi-backend';

// create api with your definition file or object
const api = new OpenAPIBackend({ definition: './petstore.yml' });

// register your framework specific request handlers here
api.register({
  getPets: (c, req, res) => res.status(200).json({ result: 'ok' }),
  getPetById: (c, req, res) => res.status(200).json({ result: 'ok' }),
  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();
```

--------------------------------

### Test API Endpoints with API Key

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/express-apikey-auth/README.md

Use curl to test the /pets and /pets/{id} endpoints, providing the 'x-api-key' header with a secret value.

```bash
curl -i http://localhost:9000/pets -H x-api-key:secret
curl -i http://localhost:9000/pets/1 -H x-api-key:secret
```

--------------------------------

### Test OpenAPI Backend Endpoints

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/aws-sam/README.md

Use curl to test the /pets and /pets/{id} endpoints of the running API. This verifies that the backend is functioning correctly.

```bash
curl -i http://localhost:3000/pets
curl -i http://localhost:3000/pets/1
```

--------------------------------

### Fastify Integration

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Integrate with Fastify by defining a route that handles all methods and paths. Ensure Fastify is set up to parse request bodies.

```typescript
import fastify from 'fastify';

fastify.route({
  method: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE'],
  url: '/*',
  handler: async (request, reply) =>
    api.handleRequest(
      {
        method: request.method,
        path: request.url,
        body: request.body,
        query: request.query,
        headers: request.headers,
      },
      request,
      reply,
    ),
});
fastify.listen();
```

--------------------------------

### Test API Endpoints

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/express-jwt-auth/README.md

Use these curl commands to test the login endpoint and the protected /me endpoint which requires an Authorization header.

```bash
curl -i http://localhost:9000/login
```

```bash
curl -i http://localhost:9000/me -H "Authorization: <token>"
```

--------------------------------

### Hapi Integration

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Integrate with Hapi by defining a catch-all route. This handler processes incoming requests using OpenAPI Backend.

```javascript
import Hapi from '@hapi/hapi';

const server = new Hapi.Server({ host: '0.0.0.0', port: 9000 });
server.route({
  method: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE'],
  path: '/{path*}',
  handler: (req, h) =>
    api.handleRequest(
      {
        method: req.method,
        path: req.path,
        body: req.payload,
        query: req.query,
        headers: req.headers,
      },
      req,
      h,
    ),
});
server.start();
```

--------------------------------

### Set API Gateway URL Environment Variable

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/aws-cdk/README.md

Set an environment variable with the outputted API Gateway URL for easier access in subsequent commands.

```bash
export CDK_OUTPUT_API_GW_URL=https://ie88ixpq7g.execute-api.eu-west-1.amazonaws.com
```

--------------------------------

### AWS Serverless (Lambda) Integration

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Adapt the OpenAPI Backend for use with AWS Lambda by creating a handler function that maps API Gateway proxy event properties to the expected request format for handleRequest.

```javascript
// API Gateway Proxy handler
module.exports.handler = (event, context) =>
  api.handleRequest(
    {
      method: event.httpMethod,
      path: event.path,
      query: event.queryStringParameters,
      body: event.body,
      headers: event.headers,
    },
    event,
    context,
  );
```

--------------------------------

### Test API Endpoints with cURL

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/azure-function/README.md

Uses cURL to test the /pets and /pets/{id} endpoints of the running Azure Functions API. These commands verify that the API is responding correctly to requests.

```bash
curl -i http://localhost:9000/pets
curl -i http://localhost:9000/pets/1
```

--------------------------------

### Test API Endpoints

Source: https://github.com/openapistack/openapi-backend/blob/main/examples/aws-cdk/README.md

Make curl requests to test the deployed API endpoints. Replace the URL with your actual API Gateway URL.

```bash
curl -i "$CDK_OUTPUT_API_GW_URL/pets"
```

```bash
curl -i "$CDK_OUTPUT_API_GW_URL/pets/1"
```

--------------------------------

### Azure Function Integration

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Use this snippet to integrate with Azure Functions. It handles incoming requests and passes them to the OpenAPI Backend.

```javascript
module.exports = (context, req) =>
  api.handleRequest(
    {
      method: req.method,
      path: req.params.path,
      query: req.query,
      body: req.body,
      headers: req.headers,
    },
    context,
    req,
  );
```

--------------------------------

### Express Integration

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Integrate OpenAPI Backend with an Express application by using its handleRequest method as middleware. Ensure express.json() is used to parse JSON request bodies.

```javascript
import express from 'express';

const app = express();
app.use(express.json());
app.use((req, res) => api.handleRequest(req, req, res));
app.listen(9000);
```

--------------------------------

### Register 'notImplemented' Handler for Mocking

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Register a 'notImplemented' handler to intercept requests and generate mock responses using `mockResponseForOperation()`. This is useful for operations that do not have custom handlers defined yet.

```javascript
api.register('notImplemented', (c, req, res) => {
  const { status, mock } = c.api.mockResponseForOperation(c.operation.operationId);
  return res.status(status).json(mock);
});
```

--------------------------------

### Registering Operation Handlers

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Register specific handlers for operations defined in your OpenAPI specification. Handlers receive a context object with request details.

```javascript
async function getPetByIdHandler(c, req, res) {
  const id = c.request.params.id;
  const pet = await pets.getPetById(id);
  return res.status(200).json({ result: pet });
}
api.register('getPetById', getPetByIdHandler);
// or
api.register({
  getPetById: getPetByIdHandler,
});
```

--------------------------------

### Register Security Handler for API Key Authentication

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Register a security handler for an 'ApiKey' security scheme. This handler checks for a specific API key in the request headers. A truthy return value indicates successful authorization.

```javascript
api.registerSecurityHandler('ApiKey', (c) => {
  const authorized = c.request.headers['x-api-key'] === 'SuperSecretPassword123';
  // truthy return values are interpreted as auth success
  // you can also add any auth information to the return value
  return authorized;
});
```

--------------------------------

### Register Post Response Handler for Response Validation

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Register a postResponseHandler to validate the response body against the OpenAPI schema. Ensure your operation handlers return the response data.

```javascript
api.register({
  getPets: (c) => {
    // when a postResponseHandler is registered, your operation handlers' return value gets passed to context.response
    return [{ id: 1, name: 'Garfield' }];
  },
  postResponseHandler: (c, req, res) => {
    const valid = c.api.validateResponse(c.response, c.operation);
    if (valid.errors) {
      // response validation failed
      return res.status(502).json({ status: 502, err: valid.errors });
    }
    return res.status(200).json(c.response);
  },
});
```

--------------------------------

### Registering Validation Failure Handler

Source: https://github.com/openapistack/openapi-backend/blob/main/README.md

Implement a `validationFail` handler to manage requests that do not conform to your OpenAPI schema. This handler is called when request parameters or payload validation fails.

```javascript
function validationFailHandler(c, req, res) {
  return res.status(400).json({ status: 400, err: c.validation.errors });
}
api.register('validationFail', validationFailHandler);
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.