JWT Decoder

Paste a JSON Web Token to read the header and payload as formatted JSON. The signature is not verified — use this for debugging only, not to trust token contents.

Privacy: Parsing runs entirely in your browser. The token is never transmitted to ToolBite.

Header


          

          

            
Payload

            

          

          
Signature segment: —

        

        

          
        

      

      

        
        
      

      

        
Why we do not verify signatures

        
Verifying a JWT requires the correct secret or public key. This tool only Base64url-decodes the first two segments so you can inspect claims (e.g. exp, sub) during development. Never treat decoded claims as authenticated without proper verification on your server.

        
How to use in 3 steps

        
    
          
  1. Paste the full token string in the input box.
    2. 
          
  2. Click Decode to parse header and payload JSON.
    3. 
          
  3. Inspect claims for debugging, then verify the token server-side.
    4. 
        

        
JWT Decoder FAQ

        
    
          
  • Does this verify authenticity? No, this is decode-only.
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  • Is it private? Yes, processing is local in your browser.
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  • Can I trust decoded claims? Not without signature and issuer verification on backend.
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Related tools

        

          📎
Base64
Similar encoding layer

          💻
JSON Formatter
Format decoded JSON

        

      

      

        
JWT best-practice guide

        
Understand what decoded claims mean and how to verify safely in production.

        Read JWT guide