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Welcome to Mockoon's official CLI, a lightweight and fast NPM package to deploy your mock APIs anywhere. Feed it with a Mockoon's data file, or OpenAPI specification file (JSON or YAML), and you are good to go.

The CLI supports the same features as the main application: templating system, proxy mode, route response rules, etc.

Mockoon CLI screenshot


$ npm install -g @mockoon/cli


$ mockoon-cli COMMAND


You will find Mockoon applications changelogs on the official website.

Run a mock API with the CLI

Use your Mockoon environment file

The CLI can import and migrate data from older versions of Mockoon. However, it doesn't alter the file you provide and only migrates a copy. If you created your mock with a more recent version of the application, you need to update your CLI with the following command: npm install -g @mockoon/cli.

You can run your mock in one single step using the start command and replacing ~/path/to/your-environment-file.json by the actual location of your Mockoon environment file:

$ mockoon-cli start --data ~/path/to/your-environment-file.json

To locate your environment file from the main application, right-click on a environment and select "Show in folder" in the context menu: context menu - show in folder

You can also directly load Mockoon's environment file from a URL. To do so, provide the URL as the data parameter instead of a local path:

$ mockoon-cli start --data https://domain.com/your-environment-file.json

Use an OpenAPI specification file

Another option is to directly pass an OpenAPI specification file as the data parameter. Mockoon supports both JSON and YAML formats in versions 2.0.0 and 3.0.0.

⚠️ There is currently no equivalent between all the OpenAPI specifications and Mockoon's features (more info). If you want to run your Mockoon mock APIs with the CLI with all the features (templating, rules, etc.), you must use Mockoon's data files (see above) directly, or you may lose part of your mock's behavior.

You can provide a path to a local OpenAPI specification file or directly the file's URL:

$ mockoon-cli start --data ~/path/to/your-opeanapi-file.yaml


$ mockoon-cli start --data https://domain.com/your-opeanapi-file.yaml


Mockoon's CLI has been tested on Node.js versions 18 and 20.


Start command

Starts one (or more) mock API from Mockoon's environment file(s) as a foreground process.

The mocks will run by default on the ports and hostnames specified in the files. You can override these values by using the --port and --hostname flags. --data, --port and --hostname flags support multiple entries to run multiple mock APIs at once (see examples below).

💡 To run the CLI as a background process, add an & at the end of the command: mockoon-cli start -d ./data-file.json &.

  $ mockoon-cli start

  -d, --data                  [required] Path(s) or URL(s) to your Mockoon file(s)
  -p, --port                  Override environment(s) port(s)
  -l, --hostname              Override default listening hostname(s)
  -c, --faker-locale          Faker locale (e.g. 'en', 'en_GB', etc. For supported locales, see below.)
  -s, --faker-seed            Number for the Faker.js seed (e.g. 1234)
  -t, --log-transaction       Log the full HTTP transaction (request and response)
  -X, --disable-log-to-file   Disable logging to file
  -e, --disable-routes        Disable route(s) by UUID or keyword present in the route's path (do not include a leading slash)
  -r, --repair                If the data file seems too old, or an invalid Mockoon file, migrate/repair without prompting
  -h, --help                  Show CLI help

  $ mockoon-cli start --data ~/data.json
  $ mockoon-cli start --data ~/data1.json ~/data2.json --port 3000 3001 --hostname
  $ mockoon-cli start --data https://file-server/data.json
  $ mockoon-cli start --data ~/data.json --log-transaction
  $ mockoon-cli start --data ~/data.json --disable-routes route1 route2

Faker.js options

  • Locale: You can set up Faker.js locale with the --faker-locale flag. If not provided, Faker.js will use the default locale: en. For a list of currently supported locales, you can check the supported locales list in Mockoon's commons library. You can also check Faker.js locales list for more information (⚠️ Some locales may not yet be implemented in Mockoon).
  • Seed: You can set up Faker.js seed with the --faker-seed flag. If not provided, Faker.js will not use a seed. By providing a seed value, you can generate repeatable sequences of fake data. Using seeding will not always generate the same value but rather a predictable sequence.

Dockerize command

Generates a Dockerfile used to build a self-contained image of one or more mock API. After building the image, no additional parameters will be needed when running the container. This command takes similar flags as the start command. The --disable-log-to-file flag will be enabled by default in the resulting Dockerfile.

Please note that this command will copy your Mockoon environments files you provide with the --data flag and put them side by side with the generated Dockerfile.

For more information on how to build the image: Using the dockerize command

  $ mockoon-cli dockerize

  -d, --data                  [required] Path or URL to your Mockoon file
  -p, --port                  [required] Ports to expose in the Docker container. It should match the number of environment data files you provide with the --data flag.
  -o, --output                [required] Generated Dockerfile path and name (e.g. `./folder/Dockerfile`)
  -t, --log-transaction       Log the full HTTP transaction (request and response)
  -h, --help                  Show CLI help

  $ mockoon-cli dockerize --data ~/data.json --output ./Dockerfile
  $ mockoon-cli dockerize --data ~/data1.json ~/data2.json --output ./Dockerfile
  $ mockoon-cli dockerize --data https://file-server/data.json --output ./Dockerfile

Import command

Import a Swagger v2/OpenAPI v3 specification file (YAML or JSON).

The output file will not be prettified by default. You can prettify it using the --prettify flag described below.

Note: This command is similar to the app's import feature, but it will not import directly to your desktop app. If you need to import and open in your desktop app, use the app's import feature instead.

  $ mockoon-cli import

  -i, --input                 [required] Path or URL to your Swagger v2/OpenAPI v3 file
  -o, --output                [required] Generated Mockoon path and name (e.g. `./environment.json`)
  -p, --prettify              Prettify output
  -h, --help                  Show CLI help

  $ mockoon-cli import --input ~/input.json --output ./output.json
  $ mockoon-cli import --input ~/input.yaml --output ./output.json
  $ mockoon-cli import --input ~/input.json --output ./output.json --prettify

Export command

Export a mock API to an OpenAPI v3 specification file (JSON).

The output file will not be prettified by default. You can prettify it using the --prettify flag described below.

  $ mockoon-cli export

  -i, --input                 [required] Path or URL to your Mockoon data file
  -o, --output                [required] Generated OpenApi v3 path and name (e.g. `./output.json`)
  -p, --prettify              Prettify output
  -h, --help                  Show CLI help

  $ mockoon-cli export --input ~/input.json --output ./output.json
  $ mockoon-cli export --input ~/input.json --output ./output.json --prettify

Help command

Returns information about a command.

  $ mockoon-cli help [COMMAND]

  COMMAND  command to show help for

  --all  see all commands in CLI

Use the GitHub Action

We maintain a GitHub Action that allows you to run your Mockoon CLI in your CI/CD pipelines.

You can find a sample workflow in the GitHub Action's documentation.

Here is an example of a workflow that will run your mock API on every push to the main branch:

name: Mockoon CLI demo

      - main

    runs-on: ubuntu-latest
      - uses: actions/checkout@v3
      - name: Run Mockoon CLI
        uses: mockoon/cli-action@v1
          # Mockoon CLI version, default to 'latest'
          version: 'latest'
          # Mockoon local data file or URL
          data-file: './mockoon-data.json'
          # port, default to 3000
          port: 3000
      - name: Make test call
        run: curl -X GET http://localhost:3000/endpoint`

💡 If you are building your own actions with the CLI, do not forget to add an & at the end of the command to run it in the background and avoid blocking the workflow: mockoon-cli start -d ./data-file.json &.

Docker image

Using the generic Docker image

A generic Docker image is published on the Docker Hub Mockoon CLI repository. It uses node:18-alpine and installs the latest version of Mockoon CLI.

All of mockoon-cli start flags (--port, etc.) must be provided when running the container.

To load the Mockoon data, you can either mount a local data file and pass mockoon-cli start flags at the end of the command:

docker run -d --mount type=bind,source=/home/your-data-file.json,target=/data,readonly -p 3000:3000 mockoon/cli:latest --data data --port 3000

Or directly pass a URL to the mockoon-cli start command, without mounting a local data file:

docker run -d -p 3000:3000 mockoon/cli:latest -d https://raw.githubusercontent.com/mockoon/mock-samples/main/samples/generate-mock-data.json --port 3000

Mockoon CLI's logs will be sent to stdout/stderr (console). File logging is disabled by default in the Docker image.

Docker compose

You can also use docker-compose with a docker-compose.yml file:

  image: mockoon/cli:latest
  command: ["--data", "data", "--port", "3000"]
    test: ["CMD-SHELL", "curl -f http://localhost:3000/your-healthcheck-route || exit 1"]
    interval: 30s
    timeout: 5s
    retries: 2
    start_period: 10s
    - /home/your-data-file.json:/data:readonly

Please note that our Docker image includes an ENTRYPOINT that you may override or not. If you don't override it, and use Docker compose command, do not include mockoon-cli start as it is already included in the ENTRYPOINT.

This snippet also provides an optional healthcheck, which means you can block until the server is able to handle responses when bring it up by running docker compose up --detach --wait.

This example requires a your-healthcheck-route route configured to return a 200 status code without latency.

Using the dockerize command

You can use the dockerize command to generate a new Dockerfile that will allow you to build a self-contained image. Thus, no Mockoon CLI specific parameters will be needed when running the container.

  • Run the dockerize command:

    mockoon-cli dockerize --data ./sample-data.json --port 3000 --output ./tmp/Dockerfile

  • navigate to the tmp folder, where the Dockerfile has been generated and the environment file(s) copied:

    cd tmp

  • Build the image:

    docker build -t mockoon-image .

  • Run the container:

    docker run -d -p <host_port>:3000 mockoon-image


Logs are located in ~/.mockoon-cli/logs/{mock-name}.log. This file contains all the log entries (all levels) produced by the running mock server. Most of the errors occurring in Mockoon CLI (or the main application) are not critical and therefore considered as normal output. As an example, if the JSON body from an entering request is erroneous, Mockoon will log a JSON parsing error, but it won't block the normal execution of the application.

As the CLI is running in the foreground, logs are also sent to stdout (console).

Transaction logging

When using the --log-transaction flag, logs will contain the full transaction (request and response) with the same information you can see in the desktop application "Logs" tab.


  "app": "mockoon-server",
  "level": "info",
  "message": "Transaction recorded",
  "timestamp": "YYYY-MM-DDTHH:mm:ss.sssZ",
  "environmentName": "Demo API",
  "environmentUUID": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "requestMethod": "GET",
  "requestPath": "/test",
  "requestProxied": false,
  "responseStatus": 200,
  "transaction": {
    "proxied": false,
    "request": {
      "body": "{}",
      "headers": [{ "key": "accept", "value": "*/*" }],
      "method": "GET",
      "params": [],
      "query": "",
      "queryParams": {},
      "route": "/test",
      "urlPath": "/test"
    "response": {
      "body": "{}",
      "headers": [
        { "key": "content-type", "value": "application/json; charset=utf-8" }
      "statusCode": 200,
      "statusMessage": "OK"
    "routeResponseUUID": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
    "routeUUID": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

The transaction model can be found here.

Disable logging

You can disable the logging to the console by redirecting the stdout and stderr outputs:

  • Unix:

    mockoon-cli start --data ./data.json > /dev/null 2>&1


    mockoon-cli start --data ./data.json &> /dev/null
  • Windows (cmd):

    mockoon-cli start --data ./data.json 2> NUL


    mockoon-cli start --data ./data.json > NUL 2>&1
  • Windows (PowerShell):

    mockoon-cli start --data ./data.json 2> $null


    mockoon-cli start --data ./data.json > $null 2>&1
  • Cross platform: use dev-null-cli package

    mockoon-cli start --data ./data.json | npx dev-null

You can also disable file logging by using th --disable-log-to-file flag. This is enabled by default in the Docker image.

Mockoon's documentation

You will find Mockoon's documentation on the official website. It covers the most complex features.


Mockoon is an open-source project built by volunteer maintainers. If you like our application, please consider sponsoring us and join all the Sponsors and Backers who helped this project over time!

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Upgrade today and take your API development to the next level.

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You can discuss all things related to Mockoon's CLI, and ask for help, on the official community. It's also a good place to discuss bugs and feature requests before opening an issue on this repository. For more chat-like discussions, you can also join our Discord server.


If you are interested in contributing to Mockoon, please take a look at the contributing guidelines.

Please also take a look at our Code of Conduct.


If you want to know what will be coming in the next release you can check the global Roadmap.

New releases will be announced on Mockoon's Twitter account @GetMockoon and through the newsletter to which you can subscribe here.




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