Mock API Server

Design endpoints and simulate JSON responses locally in your browser.

3mock endpoints

Private browser simulator · no requests or configurations are uploaded

Import

Response editorConfigure the matching request

MethodPathStatusDelay (ms)

Response headers

{
  "Content-Type": "application/json",
  "X-Mock-Server": "OpenToolkit"
}

JSON response body

[
  {
    "id": 1,
    "name": "QR Code Generator",
    "category": "Productivity"
  },
  {
    "id": 2,
    "name": "JSON Formatter",
    "category": "Developer"
  }
]

Request testerMatch and run one of your endpoints

This is a local API simulator for designing and testing responses. Export the configuration to share it with your team or adapt it for JSON Server, Mockoon, or automated tests.

About Mock API Server

Design endpoints and simulate JSON API responses locally. OpenToolkit is free to use, requires no account, and processes your work locally in your browser whenever the tool allows it.

Mock API Server

About Mock API Server

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