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Run/debug multiple targets

Last modified: 04 April 2025

PyCharm provides several ways to run/debug multiple things at once, for example, a client-server app or a complex test, which requires launching several different processes or tasks. The first step in any case would be to create run configurations for each of the tasks or processes that need to be launched. Once all necessary configurations are in place, you have the following options:

When multiple configurations are launched at once, each will be available in a separate tab in the Run or Debug tool window.

Parallel launch with a compound run/debug configuration

A Compound run configuration lets you launch several run/debug configurations simultaneously.

note

The exact order of launching configurations within a compound configuration is not guaranteed.

Create a compound run/debug configuration

  1. Create a run/debug configuration for each app and process that should be launched in your session.

  2. Go to Run | Edit Configurations. Alternatively, click in the Run widget and select Edit Configurations from the drop-down menu.

    Run/Debug Configurations popup

  3. In the Run/Debug Configurations dialog, click the Add button or press AltInsert, then select Compound.

  4. Specify the run/debug configuration name in the Name field. This name will be used to identify the run/debug configuration in lists and menus.

    creating a new run/debug configuration

  5. Select Store as project file to make this run/debug configuration available to other team members.

  6. To include a new run/debug configuration into the compound configuration , click Add the Add button and select the desired one from the list.

  7. Apply the changes and close the dialog.

Once you set up the compound configuration, you can launch it with or without debugging.

Sequential launch with a 'Before Launch' task

You can use run/debug configuration's Before Launch tasks for different tasks, including launching other run/debug configurations.

Configure 'Before Launch' tasks

  1. Create a run/debug configuration for each app and process that should be launched in your session.

  2. Go to Run | Edit Configurations. Alternatively, click in the Run widget and select Edit Configurations from the drop-down menu.

    Run/Debug Configurations popup

  3. In the Run/Debug Configuration dialog, select the configuration that should be launched last.

  4. Click Modify options and select Add before launch task.

    Adding an option to the run configuration

  5. Click Add Add task, then select Run Another Configuration, and choose the desired configuration.

    Run another configuration as a before launch task

  6. Make sure that all necessary configurations are added. Use the Up Alt0↑ and Down Alt0↓ to arrange the launch order (configurations at the top will be launched first).

  7. Apply the changes and close the dialog.

Once you set up Before Launch tasks in the configuration that should be started last, you can launch it with or without debugging.

PyCharm supports the following 'Before Launch' tasks

  • Launch Web Browser: select this option to have a browser started. In the dialog that opens, select the type of the browser and provide the start URL. Also, specify if you want the browser to be launched with the JavaScript debugger.

  • Run External tool: select to run an external application. In the dialog that opens, select one or multiple applications you want to run. If it is not defined in PyCharm yet, add its definition. For more information, refer to External tools and External Tools.

  • Run Another Configuration: select to execute another run/debug configuration and wait until it finishes before starting the current configuration. If you want to run several configurations in parallel, use a compound run/debug configuration.

  • Run File Watchers: select this option to have PyCharm apply all the currently active File Watchers.

  • Run Remote External Tool: adds a remote SSH external tool.

  • Run Grunt task: select this option to run a Grunt task.

    In the Grunt task dialog that opens, specify the Gruntfile.js where the required task is defined, select the task to execute, and specify the arguments to pass to the Grunt tool.

    Specify the location of the Node.js interpreter, the parameters to pass to it, and the path to the grunt-cli package.

  • Run gulp task: select this option to run a Gulp task.

    In the Gulp task dialog that opens, specify the Gulpfile.js where the required task is defined, select the task to execute, and specify the arguments to pass to the Gulp tool.

    Specify the location of the Node.js interpreter, the parameters to pass to it, and the path to the gulp package.

  • Run npm script: select this option to execute an npm script.

    In the NPM Script dialog that opens, specify the npm run/debug configuration settings.

  • Compile TypeScript: select to run the built-in TypeScript compiler and thus make sure that all the changes you made to your TypeScript code are reflected in the generated JavaScript files. In the TypeScript Compile Settings dialog that opens, select or clear the Check errors checkbox to configure the behaviour of the compiler in case any errors are detected:

    • If the Check errors checkbox is selected, the compiler will show all the errors and the run configuration will not start.

    • If the Check errors checkbox is cleared, the compiler will show all the detected errors but the run configuration still will be launched.

  • Disconnect Data Source: select this option if you want to disrupt the connection to a data source before the run/debug configuration is run.