Free · Validate & tree-view · Nothing uploaded

JSON formatter & validator

Beautify, validate and explore JSON with a collapsible tree view. Get the exact error line for broken JSON, then copy or download. Everything runs in your browser.


              
            

          

        

        
🔒 Your JSON is formatted and validated entirely on your device — never uploaded.

      

    


    


    

      

        
How to format and validate JSON

        
Beautify messy JSON, catch errors with the exact line, and explore it as a collapsible tree — all locally.

        

          
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1. Paste JSON
Drop in raw or minified JSON from an API, config or log.

          
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2. Format or validate
Beautify with clean indentation, or get a precise error location if it's invalid.

          
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3. Explore & copy
Browse the collapsible tree, then copy formatted or minified output.

        

        
Developers use a JSON formatter to debug API responses, clean up config files, and make minified data readable. This tool validates against the JSON spec and points to the exact line and column of any syntax error, so you fix problems fast. It runs entirely in your browser, so payloads with tokens or customer data never get uploaded. Convert tabular data with JSON ↔ CSV or format queries with the SQL Formatter.

      

    


    

      

        
JSON formatter FAQ

        
Is my JSON uploaded?
No — formatting and validation run entirely in your browser.

        
Does it show the error location?
Yes — invalid JSON shows the exact line and a clear message.

        
What can it do?
Beautify, minify, validate, and view JSON as a collapsible tree, then copy or download.