CSV to JSON

Q: My file has no header row — will it work?

The first row is always used as the keys. Add a header row first for meaningful key names.

Q: Can I convert the JSON back?

Yes — JSON to CSV flattens it into a spreadsheet again.

Convert a CSV spreadsheet into a JSON array of objects.

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Files deleted automatically

Supported Formats

CSV

or drop a file here · paste with Ctrl+V

CSV

Up to 1 GB

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About CSV to JSON

CSV to JSON converts a .csv file into a JSON array of objects, using the header row as the keys. Quoted fields, commas and line breaks inside values are parsed correctly, and comma, semicolon or tab separators are all handled.

Headers written in dot notation (address.city) are rebuilt into nested objects, so a JSON → CSV → JSON round trip gives back your original structure. Files saved by Excel in older encodings are read correctly too. Files are sent over HTTPS, processed on our server and deleted automatically after you download the result.

How to use CSV to JSON

Upload a .csv file with a header row.
Press Convert.
Download the JSON file.

Key features

Header row becomes the keys
Dot-notation headers rebuilt into nested objects
RFC-4180 parsing: quotes, commas, line breaks
UTF-8 and older Windows encodings read correctly

When to use CSV to JSON

Turning a spreadsheet export into JSON for an API, a web app or test fixtures.
Converting product or contact lists into JSON for import.
Rebuilding nested JSON from a CSV created with JSON to CSV.

Tips and common problems

Make sure the first row contains clear column names — they become the JSON keys.
Use dot-notation headers (address.city) when you want nested objects.
Codes like 007 and long IDs stay text, so they are not damaged.

Frequently asked questions

Are numbers converted to numbers?−

Plain numbers such as 42, -3 or 12.5 become JSON numbers, and true/false become booleans. Anything that would change if converted — 007, +919876543210, 12.50, dates, percentages and very long IDs — stays text exactly as written.

My file has no header row — will it work?+

Can I convert the JSON back?+

Guides

How to Convert JSON to CSV — How to convert JSON to CSV: how arrays of objects map to rows and columns, how nested objects are flattened, and how to avoid losing data.
Why Excel Breaks CSV Files — and How to Open Them Correctly — Why Excel drops leading zeros, shows long IDs as 1.23E+15 and garbles Gujarati, Hindi or ₹ when opening CSV files — and how to open CSVs correctly.
UTF-8 and Garbled Text, Explained — Why Gujarati, Hindi, ₹ and accented letters turn into symbols like àª or â‚¹, what UTF-8 and a BOM are, and how to fix garbled text in files and CSVs.