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Developer Tools

Developer Tools

Fast, private & free. Everything runs in your browser — no signup, no uploads.

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Header

        
Payload

      

      

    

  







  

    

      

        
Data Converter

        
Convert between JSON, YAML, CSV and XML in any direction. Perfect for reformatting API responses, CI/CD configs and data exports.

      

      

        
Regex Tester

        
Build and debug regular expressions with live match highlighting and capture-group breakdown — no more guessing why a pattern won't match.

      

      

        
JWT Decoder

        
Inspect a JSON Web Token's header and payload instantly, with expiry detection. Ideal for debugging auth flows and API integrations.

      

    


    

      
Free online developer tools — private by design

      
These are the quick, dependable utilities developers reach for every day: a
        JSON to YAML converter (and CSV/XML), a live regex tester, and a
        JWT decoder. Everything runs locally in your browser, so there are no sign-ups,
        no uploads, and no data ever leaves your machine — safe to use with real config and tokens.


      
Frequently asked questions

      

                

          How do I convert JSON to YAML online?
          
Paste your JSON into the Data Converter above, set From: JSON and To: YAML, then click Convert. The conversion runs entirely in your browser — nothing is uploaded — and you can swap the direction (YAML → JSON) with one click. CSV and XML are supported too.

        

                

          Is this JSON/YAML converter safe for private or production data?
          
Yes. Every tool here is 100% client-side JavaScript. Your data never leaves your device, is never sent to a server, and nothing is logged. That makes these tools safe for API keys, config files, and internal payloads.

        

                

          What does the JWT decoder show, and does it verify the signature?
          
The JWT Decoder splits a token into its Header and Payload and pretty-prints both, and it flags whether the exp (expiry) has passed. It decodes only — it does not verify the cryptographic signature — so treat the contents as unverified until checked server-side with the signing key.

        

                

          Can I test a regular expression with capture groups?
          
Yes. Type your pattern and flags into the Regex Tester, paste your test string, and every match is highlighted live while each capture group is listed underneath. Invalid patterns show a clear error instead of failing silently.

        

                

          Do these developer tools work on mobile and offline?
          
They work on any modern mobile or desktop browser. Because all logic is client-side, once the page has loaded the conversions and decoding keep working even on a flaky connection.