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CSV to JSON Converter

Convert CSV to JSON and JSON back to CSV in your browser, with header detection, delimiters, number typing and download.

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Runs entirely in your browser. Your files and text are never uploaded to our server.

About this toolCSV to JSON Converter turns a spreadsheet export into clean JSON in one click.
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  • Instant results
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CSV to JSON Converter turns a spreadsheet export into clean JSON in one click. Paste CSV data or open a .csv file, and each row becomes a JSON object with the column names as keys — ready for an API, a web app or a configuration file.

It works in the other direction too: switch to JSON → CSV to turn a JSON array into a CSV file you can open in Excel or Google Sheets. Quoted values, commas inside fields, line breaks, semicolon and tab-separated files are all handled.

More about CSV to JSON ConverterHow to use, good to know & FAQ

How to use CSV to JSON Converter

  1. Paste your CSV (or JSON) into the box, or open a file.
  2. Choose the conversion and delimiter, and whether the first row is a header.
  3. Click Convert, then copy or download the result.

Good to know

  • Fields that contain commas, quotes or line breaks must be in double quotes, as in RFC 4180. The converter reads them correctly.
  • Numbers with leading zeros, such as 007 or postal codes, stay as text so nothing is lost.
  • Duplicate column names get a suffix (_2, _3) so no values are overwritten.
  • Your data is converted in your browser and never uploaded.

Frequently asked questions

Does it work with Excel CSV files that use semicolons?

Yes. Leave the delimiter on “Detect automatically” or choose Semicolon.

How are nested JSON objects converted to CSV?

CSV is a flat table, so nested objects and arrays are written as JSON text inside the cell.

Is there a file size limit?

Files up to 20 MB work in most browsers. Very large files may be slow on older phones.

When to use CSV to JSON Converter

  • Importing a product or contact spreadsheet into a website or app
  • Creating test data or mock API responses
  • Turning an API’s JSON response into a spreadsheet
  • Cleaning exports before loading them into a database

📘 Read the guide: How to Convert CSV to JSON (and JSON to CSV)