UI bugs have been fixed

Operation cancellation is now supported

Log export functionality has been added

Overall performance has been improved

OneApi is an all-in-one local development tool designed for developers who need full control over API testing, mocking, and local hosting — without external dependencies.

With OneApi, you can test HTTP requests, simulate real server behavior, host static websites, and stream assets across your local network, all from a single lightweight application.

Key Features

API Testing & Mock Server

Create custom API endpoints locally

Customize response headers and HTTP status codes

Add artificial response delays (up to 99 seconds)

Fully inspect response headers and body

Generate dynamic response data using built-in functions

Dynamic Response Functions

Random() – Generate random integers with optional min/max

Counter() – Auto-increment values with custom start point

Word() – Return words or sentences from predefined lists or external files

Asset() – Serve asset URLs with optional tag filtering

Guid() – Generate unique identifiers

Now() – Return the current date and time

Functions are case-insensitive and evaluated using {} syntax.

Static Website Hosting

Host HTML/CSS/JS projects locally

Access hosted sites from any device on the same network

Ideal for front-end builds and static web projects

Asset Server with Streaming Support

Serve images, audio, and video files

Full support for HTTP Range requests (seek enabled)

Stream media directly in the browser

Generate QR codes to instantly open assets on mobile devices

Tag assets for better organization

FTP Server

Built-in FTP server for quick file access

Fully configurable username, password, and root folder

Developer-Focused UX

Smooth, browser-like tab management

Optimized server performance with stable memory usage

Clean, modern interface designed for productivity

Who is OneApi for?

Backend and frontend developers

API designers and testers

Developers who need a lightweight local mock server

Anyone who wants to quickly share local content across devices

OneApi runs entirely locally and gives you full control over your development environment — fast, simple, and reliable.