express-mock

This is a mock API server implementation (for use in testing automation) to create mock endpoints with static JSON data served directly from files.

Usage

For an example, see the routes/index.js on how it serves contents from routes/json/users.json on GET /users request.

Starting the server is similar to any other Express powered app:

# download dependencies
yarn install

# start the server
yarn start

Docker

This project includes a Docker compose docker-compose.yml, so you can simply run below command in a Terminal to get started:

docker-compose up --build -d

Delay

It also implements a throttling middleware to emulate response delays if needed. Delay (in milliseconds) can be configured during Docker image build, through environment or (per) request headers.

To set a delay during build time, pass the delay with the docker build command as below:

docker build --build-arg emulated_delay=1000 -t express-mock .

Or if you are using docker-compose:

export EMULATED_DELAY=5000 # on Unix
# or
set EMULATED_DELAY=5000 # on Windows, in Command Prompt
# or
$env:EMULATED_DELAY = '5000' # on Windows, in Powershell

docker-compose up --build -d

If you are running the server locally, you can set the global delay (in milliseconds) in environment before starting the server as below:

export EMULATED_DELAY=5000 # on Unix
# or
set EMULATED_DELAY=5000 # on Windows, in Command Prompt
# or
$env:EMULATED_DELAY = '5000' # on Windows, in Powershell

npm start

You can also pass the X-Emulated-Delay header in your requests to set or override the global (see above) delay setting. To turn off the emulated delay for a specific request, you can pass false in X-Emulated-Delay header.