Developer Browser-based

JWT Decoder

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

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

Header

Payload
  
 
 
How to use JWT Decoder
 

Use JWT Decoder 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-decoder.
    •  
  • Input stays in your browser unless a tool clearly says otherwise.
    •  
 
   
 
Features
 
     
  •   Decode JWT header 
  •   Decode JWT payload 
  •   Show token expiry 
  •   No upload required 
    •  
 
 
 
Use Cases
 
     
  • Inspect authentication tokens
  • Debug API integrations
  • Check token claims
    •  
 
   
  
  
 
JSON Formatter
 
Format, minify, and validate JSON data. See clear error messages with line numbers.
 
 
 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.