Now with AI Generation

Mock APIs in Seconds.

Eliminate backend delays. Describe your implementation and let AI build the mock, or create static endpoints with a single click.

Create EndpointView Registry
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AI Generator

Describe your logic in plain English and get a fully functional functional mock handler instantly.

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Custom Domains

Group your endpoints under custom base paths (e.g., /api/v1) for cleaner organizations.

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Secure Auth

30-day persistent login sessions and private/public endpoint visibility controls.

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Programmable

Write Python handlers to process headers, bodies, and maintain persistent state.

Intelligent Mock Generation

Why write boilerplate? Just tell FastDev what you need.

You Type

"Create a login endpoint that validates email and returns a JWT token."

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We Generate

def handler(url, headers, body, data):
    import jwt, time
    if not body.get("email"):
        return {"error": "Missing email"}, 400
    
    token = jwt.encode({"sub": body["email"]}, "secret")
    return {"token": token, "exp": time.time() + 3600}

Complete Feature Set

  • Static ResponsesSimple JSON returns for rapid UI testing.
  • Route MappingDefine multiple sub-routes (/users, /posts) in one go.
  • ValidationStrict input validation prevents errors before deployment.
  • RegistryCentralized dashboard to manage and monitor your active mocks.
  • State PersistenceData survives across requests (ideal for counters, carts).