A simple Express app that can respond in various ways useful for testing. It can return a particular status code, it can simulate a network delay (useful for testing latency or timeout scenarios), and it can respond with a pre-configured response body. Licensed under the MIT License.

Install dependencies:

$ npm install

or

$ yarn

Start application:

$ PORT=3000 npm start # optionally supply port via environment variable (defaults to 3000)

Send a request to the express server:

$ curl -I http://localhost:3000?statusCode={statusCode}

or

$ curl -I http://localhost:3000?delay={delayInSeconds}

Requests can also be composed by supplying multiple query params. Ex:

$ curl -I http://localhost:3000?delay={delayInSeconds}&statusCode={statusCode}

You can now supply configured responses for a given key. The configured responses will be read from an environment variable called HTTP_RESPONSE_TESTER_RESPONSES. They should be formatted standard JSON. To use this feature, send a request like the one below:

$ curl -I http://localhost:3000?body={key}

When 'key' is a key defined in the JSON environment variable, the response will be the value defined in the config for the given key.

I decided to develop this little utility because I needed a way to test how an HTTP client would behave with various possible responses.