CSV to JSON Edit your CSV data and see JSON output update in real time. Supports custom delimiters, headers, and nested key structures. Live Preview Custom Delimiters 100% Local No Upload

CSV to JSON Paste. Preview. Export. ✨ New: Smart timestamp conversion — Convert timestamps in JSON with one click.

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Drag & drop a .csv file here
or paste / click Upload File above
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1Paste your CSV data or upload a .csv file
2Configure delimiter, headers, and nested keys
3Copy, beautify, or download the JSON output

        

        
        

          
          
        

        
        
      

    

  


  
  

    

      
      
    

    

    

      
      
      First row as keys
    

    

    

      
      
    

    

    

      
      Unflatten nested keys (a.b.c → {a: {b: c}})
    

  


  






  

    
CSV to JSON Converter — Best Practices

    

      

        
Choose the Right Delimiter

        
Always verify your CSV's delimiter before converting. Commas are standard, but some exports use semicolons (European locale), tabs (TSV), or pipes. Use the Auto-detect option to let the tool figure it out, or select manually from the config bar.

      

      

        
Handle Encoding Correctly

        
CSV files exported from Excel often use UTF-8 with BOM. The tool handles this automatically. For non-English characters (e.g., Chinese, Japanese), ensure your CSV is saved as UTF-8 to avoid garbled text in the JSON output.

      

      

        
Quote and Escape Characters

        
CSV values containing special characters (delimiters, quotes, newlines) must be properly quoted. The tool uses double-quote escaping by default. If your data has complex quoting, review the parse result and use the error bar for guidance.

      

      

        
Large File Strategy

        
For files with many rows, the JSON output is paginated at 100 rows per page. All processing stays in your browser — no server upload required. Click Download JSON to save the full file (Pro feature for large exports).

      

    

  







  

    
CSV to JSON Converter — Exclusive Features

    

      

        

          
        

        
Real-Time Live Preview

        
Edit CSV on the left, see JSON update instantly on the right. No button clicks, no page reloads. Every keystroke triggers instant conversion with PapaParse — the fastest CSV parser available.

      

      

        

          
        

        
Smart Nested Key Detection

        
CSV columns with dot notation (e.g., address.city, address.zip) are automatically converted to nested JSON objects. Toggle the Unflatten option to switch between flat and hierarchical output.

      

      

        

          
        

        
Open in JSON Editor

        
One-click transfer to the JSON Editor for further editing, beautifying, or searching. No copy-paste needed. The converted JSON data passes seamlessly between tools in your browser.

      

    

  







  

    
CSV to JSON Converter — FAQ & Troubleshooting

    
    

      How do I convert CSV to JSON online?
      
Paste your CSV data into the input area or drag and drop a .csv file. The JSON output updates in real time on the right panel. Configure delimiter, header row, and nested key options in the config bar. Click Download JSON to save. All processing happens in your browser.

    

    

      What is the difference between CSV and JSON?
      
CSV is a tabular format with rows and columns separated by delimiters. JSON is a hierarchical format that supports nested objects and arrays. CSV to JSON conversion transforms flat tabular data into structured JavaScript objects, making it ideal for APIs and programmatic processing.

    

    

      Can I convert CSV with nested dot-notation keys to JSON?
      
Yes. Enable the Unflatten option in the config bar. CSV column names containing dots (e.g., address.city, address.zip) will be automatically converted to nested JSON objects. This is useful when flattening complex data back to its hierarchical structure.

    

    

      Does the CSV to JSON converter support TSV files?
      
Yes. Set the delimiter to Tab in the config bar, or simply paste TSV data and select Auto-detect. The tool automatically detects tab-separated values, comma-separated, semicolon-separated, and pipe-delimited formats.

    

    

      How do I convert CSV to a JSON array of objects?
      
With the Header Row option enabled (default), the first row of your CSV becomes JSON property names and subsequent rows become array elements. For example, a CSV with columns name, age, city produces an array of objects like {"name":"Alice","age":28,"city":"New York"}.

    

    

      Is my CSV data safe when using this converter?
      
Yes. Your data is 100% safe. All conversion happens locally in your browser using PapaParse. No files are uploaded, no server storage occurs, and no data ever leaves your computer. The tool works fully offline after the initial page load.

    

    

      Can I edit the generated JSON before downloading?
      
Yes. Click the Open in JSON Editor button to transfer the converted JSON to the JSON Editor page, where you can edit, beautify, minify, and search through the data with syntax highlighting before downloading.

    

    

      What delimiter does the CSV to JSON tool support?
      
The tool supports Auto-detect, comma (,), tab (\t), semicolon (;), and pipe (|) delimiters. Use the dropdown in the config bar to select a specific delimiter or let the tool auto-detect the correct one based on your CSV content.