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Base URL

Formbox’s API is built on REST principles and is served over HTTPS. To ensure data privacy, unencrypted HTTP is not supported. The Base URL for all API endpoints is:
Terminal

Authentication

Authentication to Formbox’s API is performed via api-key. To authenticate, you need to include the api-key header with your API key in your requests like so:
Terminal
Learn more about how to get your API key.

Response Codes

The API returns standard HTTP response codes to indicate the success or failure of an API request. Here are a few examples:

Caveats

  • Formbox’s API is currently in public beta and is subject to change. However, we will do our best to keep breaking changes to a minimum.
Last modified on January 7, 2026