API Tester

Test REST APIs directly in your browser. Send HTTP requests with custom headers and body. View response status, headers, and formatted body. Request history included.

Request History

No requests yet.

About API Tester

Send HTTP requests to any REST API endpoint directly from your browser. Configure method, URL, headers, and request body. View the response status code, headers, and body with automatic JSON formatting. A lightweight Postman alternative that works entirely in your browser.

All HTTP Methods

Supports GET, POST, PUT, DELETE, PATCH, and HEAD. Full control over request configuration including custom headers and request body.

JSON Auto-Format

Response body is automatically formatted and syntax-highlighted if it is valid JSON. Raw text response is displayed as-is for other content types.

Request History

Last 5 requests are stored in memory for quick reference. See method, URL, and status code at a glance. Click to re-run a previous request.

100% Private

All requests are sent directly from your browser via the Fetch API. No intermediary servers, no logging, no data storage. Your API keys and data stay on your device.

📋 Common Use Cases

Development Workflow

Speed up common dev tasks — encoding, formatting, validation — without writing throwaway scripts.

Debugging & Testing

Isolate and verify code, data, or encoding issues during development and debugging.

Learning & Reference

Experiment with encoding, hashing, and transformation concepts interactively.

Production Optimization

Minify, validate, and optimize code and assets before deployment.

🪜 How to Use This Tool

  1. Enter your input
    Paste code, JSON, encoded strings, or other input. File uploads also supported where relevant.
  2. Configure tool options
    Set parameters like indentation, encoding type, hash algorithm, or validation rules.
  3. Process and view results
    Click to encode, decode, format, minify, or validate. Results appear with appropriate highlighting.
  4. Copy and use
    Copy output to clipboard for immediate use in your project, config, or debugging session.

📚 Related Guides

Frequently Asked Questions

Are these dev tools free?▼
Yes. All dev tools are completely free. No signup, no account.
Is my data sent to a server?▼
No. Base64 encoding, URL encoding, JWT decoding, hash generation, and regex testing all happen in your browser. Your tokens and secrets stay on your device.
Can I decode JWTs safely?▼
Yes. JWT decoding happens entirely in your browser. The token never leaves your device. Only the header and payload are decoded — signatures are not verified server-side.