Developer Browser-based

JWT Validator

Decode a JWT token and inspect its header, payload, and signature presence.

This tool runs in your browser. Your input is processed locally and is not uploaded.

How to use JWT Validator

Use JWT Validator when you need a quick developer utility without installing software or creating an account. Enter your values or text in the tool above, review the instant result, then copy or save the output when the tool supports it.

  • Works directly in a modern browser on desktop or mobile.
  • Designed for fast repeat use from the root URL /jwt-validator.
  • Input stays in your browser unless a tool clearly says otherwise.

Features

  • Instant browser-based results
  • No sign-up required
  • Mobile-friendly layout
  • AdSense-friendly utility page

Use Cases

  • Finish quick work tasks
  • Check calculations or formatted output
  • Create copy-ready results

JWT Decoder

Decode JSON Web Tokens locally in your browser without sending tokens to a server.

developer

JSON Validator

Validate JSON and find syntax errors instantly in your browser.

developer

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 to text. Fast, secure, and private.

developer

Frequently Asked Questions

Is this tool free?

Yes. This RunX tool is free to use in your browser.

Does this tool upload my data?

No. The tool runs locally in your browser and does not send your input to a server.

Can I use it on mobile?

Yes. The interface is responsive and works on modern mobile browsers.