Local Mock Server for Windows

Local Mock Server — Quick Windows Mock API Tool

Local Mock Server is a lightweight Windows utility that helps developers create mock APIs quickly. It’s free and provides a simple graphical interface to define multiple endpoints and their responses, enabling testing without a live backend.

How it operates

Configure each simulated endpoint by specifying a few basic properties:

• Request path (the URL route clients will call)
• JSON response body (the payload returned to the client)
• Response status code (HTTP status to send back)
• HTTP method (GET, POST, PUT, DELETE, etc.)

Once endpoints are defined you can run the server locally and have your application hit these mock routes just like a real API.

Why use it

• Speeds up frontend and integration development when backends aren’t ready
• Lets you reproduce different server behaviors and error conditions reliably
• Keeps testing environments self-contained and offline-capable
• Offers a minimal, easy-to-learn interface so teams can adopt it quickly

Alternative option to consider

If you’re looking for a different kind of free desktop utility, try Outlook on Desktop — a separate tool that pins your mail/calendar to the Windows desktop. It doesn’t replace a mock API server but can be a useful companion for developers who want quick access to email and scheduling while building.