Does This Create A Live API URL?

No. It creates deterministic response bodies locally. Download the JSON or use it in your own mock server, test runner or development fixture.

The same seed, schema, resource and page reproduce the same values, which makes tests and screenshots easier to compare.

Mock API Response Generator

Build deterministic JSON fixtures from typed fields, response envelopes, HTTP statuses and reusable seeds.

Request WorkbenchDeterministic local fixtures · no network request

MethodEndpointStatusLatencyRows

Presets

Response SchemaOne field:type pair per line

Types: string, number, integer, boolean, email, date, uuid, url.

SeedEnvelopePagePage Size

200 ResponseGET /api/users · 120 ms simulated

Method

GET

Status

200

Returned

Seed

browsertools-demo

{
  "data": [
    {
      "id": "481d3a4b-62b9-4fa3-9dc2-273ed4fcff6f",
      "name": "name 1",
      "email": "email1@example.test",
      "active": false,
      "createdAt": "2025-10-10"
    },
    {
      "id": "14ee9978-66cf-4c50-8805-e993dc81ad89",
      "name": "name 2",
      "email": "email2@example.test",
      "active": false,
      "createdAt": "2024-03-04"
    },
    {
      "id": "b7327fbf-0215-4f75-9c3f-5f9c9eeca159",
      "name": "name 3",
      "email": "email3@example.test",
      "active": false,
      "createdAt": "2024-12-16"
    }
  ],
  "meta": {
    "page": 1,
    "pageSize": 10,
    "returned": 3,
    "hasMore": false
  }
}

Content-Type: application/json · Generated in this tab

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What Is the Mock API Response Generator?

The Mock API Response Generator is a deterministic local fixture workbench. Define field names and types, choose an HTTP status and envelope, set a seed and generate repeatable JSON arrays, data objects, paginated responses or structured error responses.

How It Works

Choose a preset or enter one field:type pair per line. Set rows, status, seed and envelope, inspect the formatted result, then copy or export JSON or PDF. The latency value documents a simulated delay; this page does not expose a hosted endpoint.

When to Use It

Use it while designing frontend states, examples, documentation and automated-test fixtures that need stable, shareable JSON without personal data or a live backend.

Frequently Asked Questions

Does This Create A Live API URL?: No. It creates deterministic response bodies locally. Download the JSON or use it in your own mock server, test runner or development fixture.
Why Use A Seed?: The same seed, schema, resource and page reproduce the same values, which makes tests and screenshots easier to compare.

Found an issue? Send Feedback. See our data sources and update policy for tools that depend on changing information.