Custom Functions Operations

The easiest way to manage Custom Functions is through HarperDB Studio. It performs all the necessary operations automatically. To get started, navigate to your instance in HarperDB Studio and click the subnav link for “functions”. If you have not yet enabled Custom Functions, it will walk you through the process. Once configuration is complete, you can manage and deploy Custom Functions in minutes.

HarperDB Studio manages your custom functions using 9 HarperDB operations. You may view these operations within our API Docs. A brief overview of each of the 9 operations is below:


  • custom_functions_status
    Returns the state of the Custom functions server. This includes whether it is enabled, upon which port it is listening, and where its root project directory is located on the host machine.
  • get_custom_functions
    Returns an array of of projects within the Custom Functions root project directory. Each project has details including each of the files in the routes and helpers directories, and the total file count in the static folder.
  • get_custom_function
    Returns the content of the specified file as text. HarperDB Studio uses this call to render the file content in its built-in code editor.
  • set_custom_function
    Updates the content of the specified file. HarperDB Studio uses this call to save any changes made through its built-in code editor.
  • drop_custom_function
    Deletes the specified file.
  • add_custom_function_project
    Creates a new project folder in the Custom Functions root project directory. It also inserts into the new directory the contents of our Custom Functions Project template, which is available publicly, here:
  • drop_custom_function_project
    Deletes the specified project folder and all of its contents.
  • package_custom_function_project
    Creates a .tar file of the specified project folder, then reads it into a base64-encoded string and returns that string the the user.
  • deploy_custom_function_project
    Takes the output of package_custom_function_project, decrypts the base64-encoded string, reconstitutes the .tar file of your project folder, and extracts it to the Custom Functions root project directory.