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API mocking lets you define HTTP endpoints that return whatever response you configure — a specific status code, custom headers, and a body you control. Instead of waiting for a backend to be ready or spinning up a local server, you point your frontend or integration code at a Swisstools mock URL and get consistent, predictable responses immediately.

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What you can configure

Each mock endpoint is defined by five properties:

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How mock URLs work

Every project gets a unique base URL derived from your team and project identifiers:
Where <team_ref> is your team’s 8-character reference ID and <project_slug> is your project’s slug. You can find the full base URL on your project page. For example, a mock configured with path /users on the project my-api belonging to team abc12345 is reachable at:

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Instant updates

Changes to a mock take effect immediately. Update the status code, swap the response body, or add a header — the very next request to that URL sees the new response. There is no cache to clear and no server to restart.

Create a mock endpoint

Step-by-step guide to creating and configuring your first mock.

Using your mock URL

How to construct and call your mock endpoint URL.