Starfleet API — free mock REST API for testing

Command a small fleet: crew rosters, warp-speed changes with physics-based validation, a breached warp core that refuses orders, and a tribble endpoint that doubles on every GET — a read that mutates, which your test suite should absolutely complain about.

The Starfleet API runs ships and crews under warp-factor limits, and breeds tribbles that multiply exponentially on every read of their population. That growing number is the point: it is the catalog's only endpoint whose response changes on its own between two identical requests, which is exactly what breaks a naive snapshot test.

Base URL: https://funapi.dev/api/starfleet/v1 · 10 endpoints · OpenAPI 3.1 spec and Postman collection available. New here? Read the getting started guide.

Example request and response

GET https://funapi.dev/api/starfleet/v1/ships — List ships, filter by class or status. No token, no signup:

curl -i https://funapi.dev/api/starfleet/v1/ships

answers 200 OK with:

{
  "total": 4,
  "data": [
    {
      "id": 1,
      "name": "USS Curiosity",
      "registry": "NCC-1704",
      "class": "Constitution",
      "status": "active",
      "warpCore": "stable",
      "currentWarp": 0
    },
    {
      "id": 2,
      "name": "USS Paperwork",
      "registry": "NCC-9021",
      "class": "Miranda",
      "status": "active",
      "warpCore": "stable",
      "currentWarp": 2
    },
    {
      "id": 3,
      "name": "USS Redundancy",
      "registry": "NCC-4242",
      "class": "Excelsior",
      "status": "in-refit",
      "warpCore": "offline",
      "currentWarp": 0
    },
    {
      "id": 4,
      "name": "USS Boldly",
      "registry": "NCC-1138",
      "class": "Defiant",
      "status": "active",
      "warpCore": "breached",
      "currentWarp": 0
    }
  ]
}

Open and run this endpoint

What you can practise here

• Read the tribble population twice and watch a snapshot assertion fail on data that was never written.
• Set a warp factor above the ship's limit and read the validation error.
• Assign a crew member to two ships and check the conflict.
• Reset the sandbox and confirm the population returns to its seed value.

ships

the fleet, mostly functional

• GET /starfleet/v1/ships — List ships, filter by class or status · Responds with 200 Link to this endpoint
• GET /starfleet/v1/ships/{id} — Get one ship · Responds with 200 404 Link to this endpoint
• POST /starfleet/v1/ships — Commission a new ship (requires Bearer auth) · Responds with 201 400 401 409 Link to this endpoint
• PUT /starfleet/v1/ships/{id}/warp — Set warp factor (physics says no above 9.9) (requires Bearer auth) · Responds with 200 400 401 404 409 Link to this endpoint

crew

rosters and redshirts

• GET /starfleet/v1/crew — List crew, filter by species or ship · Responds with 200 Link to this endpoint
• GET /starfleet/v1/crew/{id} — Get one crew member · Responds with 200 404 Link to this endpoint
• POST /starfleet/v1/crew — Enlist a crew member (requires Bearer auth) · Responds with 201 400 401 404 Link to this endpoint
• DELETE /starfleet/v1/crew/{id} — Discharge a crew member (admin only) (requires Bearer auth) · Responds with 204 401 403 404 Link to this endpoint

tribbles

do NOT keep GETting

• GET /starfleet/v1/tribbles — Count tribbles — doubles on EVERY read · Responds with 200 Link to this endpoint
• POST /starfleet/v1/tribbles/purge — Beam the tribbles away (admin only) (requires Bearer auth) · Responds with 200 401 403 Link to this endpoint

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All 39 mock REST APIs

Use this response elsewhere

• JSON to TypeScript on fundata.dev — an interface for this response
• JSON to Zod on fundata.dev — a runtime validator for it
• mock API data on fundata.dev — thousands of records of the same shape for your own fixtures

Unofficial and fan-made. The Starfleet API is a practice API that borrows a theme; it is not affiliated with, sponsored or endorsed by the owners of the names it references, which belong to them. Every record it returns is test data for exercising HTTP behaviour, not an authoritative source on the subject.

Last updated 2 October 2026