API Mock Engine

Mock APIs in seconds. No account required.

The fastest way for developers to create, manage, and test mock endpoints. Start building immediately in Guest Mode—your data stays in your browser until you're ready to sync to the cloud.

MockFlow Editor
Endpoint: GET /api/v1/products
Status: 200 OK
Response Headers: Content-Type: application/json
Response Body:
{
  "status": "success",
  "data": {
    "products": [
      { "id": "prod_01J82", "name": "Mechanical Keyboard" },
      { "id": "prod_01K99", "name": "Wireless Mouse" }
    ]
  }
}

Instant Access

No forms, no signups, no waiting. Open MockFlow and start building your schema instantly. Local-first architecture means sub-millisecond response times.

Full Control

Customize every detail: method, path, headers, and dynamic body content. Full CRUD support for all your testing needs.

Response Profiles

Toggle between success, error, and timeout scenarios with a single click to test your app's resilience.

Precision JSON Editor

Our editor uses JetBrains Mono for perfect alignment and readability, validating your schemas in real time.

Choose Your Workflow

Start local, move to the cloud whenever you're ready.

FeatureGuest ModeAccount ModeCloud
Storage LocationLocal Browser StorageEncrypted Cloud Sync
AccessibilitySingle DeviceCross-Device Access
Collaboration--Team Shared Projects
History & LogsLast 24 HoursUnlimited Log Retention
Account SetupInstant (No Signup)Minutes to Start

Ready to build your next API?

Create your first mock endpoint in under 60 seconds.