API Tester REST & JSON Client

Test REST APIs anywhere, anytime. Mobile API Tester is a simple, lightweight API testing tool that lets you check Web APIs and REST APIs from your Android device—perfect for developers on the go.

Whether you need to demo an API during a client meeting, verify a production endpoint while out of the office, or check a JSON response without firing up your laptop, Mobile API Tester is the lightweight HTTP client you've been looking for. If you find Postman too heavy and feature-bloated for quick API checks, this is the streamlined alternative for individual developers and small teams.

▼ Who is this for?
・Android developers who want to test APIs from their phone or tablet
・Engineers who need to verify API behavior during meetings or while traveling
・REST API developers who want a quick way to hit endpoints
・Anyone who needs formatted JSON response viewing
・Developers looking for a simple API tester with minimal ads
・Users who find Postman overkill and want something more lightweight

▼ Main Features

【1】API Request Sending
・HTTP methods: GET / POST / PUT / DELETE
・Direct URL input for endpoints
・Request header editing (multiple headers supported)
・HTTP header type selection dialog
・JSON request body input
・JSON body editing support ("":"" add button)

【2】Response Display
・Status code display (200 / 404 / 500 at a glance)
・Response body shown with automatic JSON formatting
・Response header inspection

【3】History & Sharing
・Successful API calls are automatically saved to history
・Easily replay requests from history
・Share requests and responses via SNS

【4】User-Friendly Settings
・Dark mode support (easy on the eyes for night work)
・Multi-language support (Japanese / English / Korean / Simplified Chinese)

▼ Use Cases

・Quick checks during REST API development
・Health checks on production and staging environments
・API demos during client meetings
・Verifying API behavior while traveling or commuting
・Teaching API communication to junior engineers
・A simpler alternative to Postman for everyday HTTP testing

▼ Solving Developer Pain Points

・"I can't test APIs without my laptop" → Test instantly from your phone
・"Postman has too many features I don't need" → Just the essentials, nothing more
・"I need to check API responses on the move" → Available anywhere, anytime
・"JSON responses are hard to read" → Auto-formatted for clarity
・"Re-typing the same request is tedious" → History feature makes it reusable

▼ A Note from the Developer

Mobile API Tester was built to solve a simple need: developers want to quickly hit an API and see the response without all the overhead. No complex setup, no steep learning curve. Install it and start testing REST APIs in seconds.

Whether you're working on API development, REST development, web development, or backend engineering, this tool is built for you. We welcome your feedback and feature requests.

【Related Keywords】
API tester, API testing, REST API, REST client, HTTP client, JSON formatter, JSON viewer, web API, endpoint testing, HTTP request, GET, POST, PUT, DELETE, Postman alternative, API debug, API development, backend development, Android API tool, mobile API client, API check