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The developer toolbox that never sees your data

Format JSON, decode JWTs, hash strings, generate UUIDs and passwords, convert Base64, test regex and more — fast, free, and computed entirely in your browser. Nothing you paste is ever uploaded.

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convertatlas.org / json-formatter 

          

        

      

    

    

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Popular tools
The utilities developers reach for every day.

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          Converters
          
JSON Formatter

          
Format, beautify, minify and validate JSON instantly in your browser.

        
              
          

          Crypto & Security
          
JWT Decoder

          
Decode and inspect the header and payload of any JWT.

        
              
          

          Web
          
Regex Tester

          
Test regular expressions against text in real time, with live match highlighting.

        
              
          

          Crypto & Security
          
Hash Generator

          
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text.

        
              
          

          Web
          
Cron Expression Parser

          
Translate cron expressions into plain English and build new schedules.

        
              
          

          Generators
          
UUID Generator

          
Generate one or many random version-4 UUIDs instantly.

        
              
          

          Web
          
Color Converter

          
Convert colors between HEX, RGB and HSL, with a live preview.

        
              
          

          Converters
          
YAML to JSON Converter

          
Convert YAML to JSON and JSON to YAML instantly.

        
          

  






  

    
Browse by category
Everything, organised.

    

              
          

          
Converters

          
Transform data between formats.

          34 tools
        
              
          

          
Crypto & Security

          
Hashes, tokens and secure helpers.

          15 tools
        
              
          

          
Web

          
Encoders and web-format helpers.

          27 tools
        
              
          

          
Text

          
Manipulate and inspect text.

          50 tools
        
              
          

          
Generators

          
Generate IDs, values and data.

          8 tools
        
              
          

          
Reference

          
Lookups developers reach for daily.

          2 tools
        
          

  






  

    

      
From the guides
Practical explainers behind the tools.

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          Data formats
          
How to Format and Validate JSON (A Practical Guide)

          
What JSON formatting really does, the most common errors that break parsers, and how to read a messy payload in seconds.

           5 min read
        
              
          Security
          
What Is a JWT and How to Decode One Safely

          
The three parts of a JSON Web Token, what the claims mean, and why decoding is not the same as verifying.

           6 min read
        
              
          Web
          
301 vs 302 Redirects: Which to Use and Why It Matters

          
The SEO and caching differences between permanent and temporary redirects, and how to write the rules for Apache and Nginx.

           5 min read
        
          

  






  

    

      
Portfolio & CV templates
Free, professional website templates — ready to preview and download.

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        Developer portfolio
        
Developer portfolio template

        
A complete developer portfolio with a project grid, animated skill bars, experience timeline and contact form.

      
      
        CV & resume
        
Professional resume portfolio

        
A modern CV portfolio with experience, achievements, skills, references and a Download Resume button.

      
      
        Designer portfolio
        
UI/UX designer portfolio

        
An elegant designer portfolio with case studies, a design process, tools and a booking section.

      
    

  






  

    

      

        
Private by design
Every tool runs client-side. Your payloads, tokens and secrets never touch a server, because there is no server-side processing.

        
Fast & lightweight
No bloated frameworks on tool pages. Server-rendered HTML with focused vanilla JavaScript that loads instantly.

        
Correct & verifiable
Tool logic is checked against authoritative references and known test vectors, with open-source algorithms credited.

      

    

  






  

    

      
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