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Documentation Index

Fetch the complete documentation index at: https://momentic.ai/docs/llms.txt

Use this file to discover all available pages before exploring further.

Use Mock route steps to intercept requests and return your own responses. Useful for testing frontends without a backend, overriding feature flags, or forcing error states.

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Mocking a route

Example: capture GET /todos and return fake data. Set a URL matcher (and optional method) on a Mock route step, then write a responseGenerator - JavaScript that receives the intercepted mock.request and returns a Response: 
- mock:
    regex: "/todos" # URL matcher; also accepts substring, glob, or domain
    method: GET
    responseGenerator: |
      const url = new URL(mock.request.url);

      const fakeTodo = {
        id: url.searchParams.get("id"),
        name: "My todo item",
        done: false,
        description: "An item that I need to do",
      };

      return new Response(JSON.stringify([fakeTodo]), {
        status: 200,
        headers: { "content-type": "application/json" },
      });

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Modifying the real response

To override part of the real response (e.g. a single feature flag), set fetchOriginalResponse: true (the editor’s Fetch real response toggle) so mock.response is populated before your generator runs: 
- mock:
    regex: "/api/flags"
    fetchOriginalResponse: true
    responseGenerator: |
      const originalJson = await mock.response.json();

      return new Response(
        JSON.stringify({
          ...originalJson,
          flags: {
            ...originalJson.flags,
            momentic_test: true,
          },
        }),
        {
          status: mock.response.status,
          headers: mock.response.headers,
        },
      );

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Referencing a mock

Each mock has a key, either configured on the step or auto-generated. Save the step output to a variable to reference an auto-generated key later.

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Removing a mock

Use a Remove route mock step with the key to remove a specific mock. Omit the key to remove all mocks.

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Updating a mock

Register a new mock with the same key. A different key with the same URL matcher will not replace the existing mock.

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Debugging

If a response generator throws, Momentic responds with status 500 and the error message in the body, visible in your app and in Momentic’s network viewer.
Network viewer