How to Use API Tester & Debugger – Free Online Tool

Test and debug API endpoints online. Send HTTP requests and view responses. Free API tester.

Getting Started

API Tester & Debugger – Free Online Tool runs in your browser—no install, no account. You test and debug api endpoints online. send http requests and view responses. free api tester. right there. Data stays on your device.

Using the Tool

1. Open the API Tester & Debugger – Free Online Tool page
2. Add your input (file, text, or whatever the tool needs)
3. Hit the main action button
4. Copy or download the result

That’s it. Most tools finish in under a second.

Tips

• Input quality matters – Garbage in, garbage out. Clean input = better output.
• Check the output – Quick skim before you copy or download.
• Try different settings – Some tools have options worth tweaking.

Common Questions

Is it free? Yes. No paywall, no signup.

Where does my data go? Nowhere. Processing runs locally in your browser.

Works on mobile? Yep. Any modern browser.

Related

Need something else? Check All Tools or similar tools in the Developer category.