JSON Formatter Format / Validate / Inspect / Learn

JSON Formatter and Validator

Paste JSON once, then format, validate, minify, repair common issues, inspect the tree, look up paths, and export flattened CSV without sending data anywhere.

Browse Questions
Input JSON
Ready. Paste JSON and choose a tool.
Output

          
          
        

        

          

            
            
          

          
        

      

    


    

      

        
Format and Clean

        
Make raw JSON readable, optionally sort keys, or repair common copy-paste issues like smart quotes and trailing commas.

        

          
          
          
        

      

      

        
Minify and Convert

        
Compress JSON for API payloads, convert objects to path lines, or build a CSV preview from arrays of objects.

        

          
          
          
        

      

      

        
String Utilities

        
Turn JSON into an escaped string for code snippets or parse a JSON string back into readable JSON.

        

          
          
          
        

      

    


    

      

        

          
JSON Question Bank

          
Practical questions for learning, interviews, API debugging, validation, privacy, and performance.

          

        

        
        
      

      

      

    


    
  


  


    
    

        
JSON Formatter and Validator

        
JSON Formatter and Validator helps you paste, upload, or edit JSON, then validate its structure, format it for readability, or minify it for compact use. The workflow is simple: check syntax first, review errors, inspect nested data in a tree or table view, and copy the cleaned output for APIs, configs, logs, or documentation.
How to Use This App
  • Paste your JSON text into the editor or upload a JSON file
  • Validate the JSON to check for syntax errors and structure issues
  • Format the JSON to make nested objects, arrays, and keys easier to read
  • Use minify, repair, flatten, tree view, path lookup, or CSV preview as needed
  • Review the statistics and output panels to understand the JSON size and structure
  • Copy or download the cleaned JSON when you are finished
Examples and Use Cases
Validate an API response before using it: Paste a REST API response such as {"status":"success","items":[...]} to confirm that the payload is valid JSON before sharing it with a frontend, test script, or documentation page.
 
Format a compressed JSON payload: When a response arrives on one line, use the formatter to expand it into readable indentation so nested objects, arrays, IDs, timestamps, and settings are easier to review.
 
     
  • Input: {"user":{"id":101,"name":"Amit"},"active":true}
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  • Output: A neatly indented JSON structure with the user object and active flag on separate readable lines.
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Find the exact path of a nested value: Use the tree view or path lookup to locate fields such as $.orders[0].customer.email, which is useful when mapping JSON data into code, SQL, reports, or test assertions.
 
Convert array data into a table or CSV preview: Paste a JSON array of users, products, logs, or transactions and preview it in a table-like format before copying it into a spreadsheet or analysis workflow.
 
Repair common JSON mistakes: Use the repair option when copied data has simple issues such as trailing commas, smart quotes, or unquoted keys, then validate the cleaned result before saving or reusing it.
Helpful Details
Common JSON Mistakes to Check
 
     
  • Trailing commas: JSON does not allow an extra comma after the last item in an object or array.
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  • Unquoted keys: Object keys must be wrapped in double quotes, such as "name".
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  • Single quotes: JSON strings must use double quotes, not single quotes.
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  • Invalid values: JSON supports strings, numbers, booleans, null, arrays, and objects. Values like undefined are not valid JSON.
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Tips for Working With Large JSON
 
     
  • Format first: Beautify compressed JSON before reviewing nested fields.
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  • Use path lookup: Search for exact values using paths such as $.users[0].email.
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  • Flatten when comparing: Flattened paths make it easier to compare payloads, logs, and API responses.
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  • Minify before sending: Use minified JSON when smaller payload size matters.
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Privacy and Browser-Based Use
 
This tool runs directly in the browser, so JSON content can be processed without sending it to an external server. This is useful when checking API responses, configuration files, test data, or copied log payloads.
 
For sensitive production data, remove passwords, tokens, personal information, and secret keys before sharing, downloading, or pasting the cleaned JSON into another system.
Frequently Asked Questions
What can I do with the JSON Formatter and Validator?
You can paste or upload JSON, validate its syntax, format it for readability, minify it for compact use, inspect it in a tree view, flatten nested data, look up JSON paths, and preview supported data as a table or CSV.
Does the tool fix invalid JSON automatically?
The tool can help repair some common issues, such as trailing commas, smart quotes, and simple unquoted keys. You should still validate the result after repair to confirm the JSON is correct.
Is my JSON data sent to a server?
No. The app is designed to run directly in the browser with zero external dependencies, so the JSON is processed locally on your device.
Can I use this tool for API responses?
Yes. It is useful for formatting REST API responses, checking response syntax, finding nested fields, copying JSON paths, and preparing cleaned JSON for testing or documentation.
What is the difference between formatting and minifying JSON?
Formatting adds indentation and line breaks so JSON is easier to read. Minifying removes unnecessary spaces and line breaks so the JSON is smaller and easier to send or store.
Can this app convert JSON to CSV?
Yes, when the JSON structure is suitable, such as an array of similar objects. Deeply nested or mixed structures may need flattening or manual cleanup before CSV output is useful.