Start in seconds like a mock server. Scale to a deterministic event runtime.

The Easiest Way to Build Stateful APIs for Frontend, QA & AI Agents

Name: Mockbit
Author: Mockbit

Instant fake REST APIs with true in-memory mutation, foreign key integrity, Git branching, time-travel history, and deterministic multi-system event cascades.

Interactive Live API Console

Stateful Mutations Mode:ON (State Persists)

GEThttps://mockbit.io/api/v1/public/products

Live Response Payload (2 items):200 OK

[
  {
    "id": "prod_1",
    "title": "Essence Mascara Lash Princess",
    "price": 9.99,
    "category": "beauty"
  },
  {
    "id": "prod_2",
    "title": "Eyeshadow Palette with Mirror",
    "price": 19.99,
    "category": "beauty"
  }
]

Instant Shareable Custom API

Need a Custom Endpoint in 5 Seconds?

Paste any JSON response body and get an instant shareable mock URL with zero setup or sign-up.

Dynamic Image & Avatar Placeholder API

Zero-dependency, resolution-independent, SVG image and avatar placeholders for your frontend prototypes.

Image Placeholder (300×180)

GET /api/v1/public/image/300x180

Dynamic SVG Avatar (Jane)

GET /api/v1/public/avatar/jane

Dynamic SVG Avatar (User 42)

GET /api/v1/public/avatar/user42

Why Developers Upgrade to Mockbit

Start with static mocks in seconds. Scale to stateful workflows and reproducible event runtimes without changing tools.

Capability / Feature	Traditional Static Mocks	Mockbit Runtime
Static Placeholder JSON Datasets	✓ Yes	✓ Yes (13+ Public Specs)
Dynamic SVG Placeholder Images & Avatars	✓ Raster Images	✓ Vector SVG & Avatars
In-Memory Stateful Mutations (POST/PUT/DELETE)	✗ Unpersisted Fake Response	✓ Real In-Memory State Mutation
Relational FK Integrity & Cascade Deletes	✗ Isolated Objects	✓ Enforced FK Cascades
Git-Style Branch Environment Isolation	✗ Single Global State	✓ Header X-Mockbit-Branch
Time-Travel State Rewind & History	✗ No History Ledger	✓ Instant v1 ➔ v12 Rewind
Multi-System Event Cascades & Tracing	✗ No Events	✓ Deterministic Event DAGs
Domain Invariants & Business Rule Checks	✗ No Invariants	✓ Business Rule Enforcement
Autonomous AI Agent Evaluation Substrate	✗ Not Supported	✓ Mockbit Arena Substrate