How are the JSON keys decided?

With 'First row is headers' ticked (the default), the first row's values become the keys of every object. Unticked, keys are generated as col1, col2, col3… and every row — including the first — becomes data.

Are numbers converted to JSON numbers?

No — every value stays a string, exactly as written in the CSV ('030' keeps its leading zero, '1.50' keeps its trailing zero). That is the honest default: CSV carries no type information, so guessing types silently corrupts phone numbers, postcodes and prices.

What CSV dialects are supported?

Comma, semicolon and tab delimiters are auto-detected from the first row. Quoted fields follow the standard rules: wrap a field in double quotes to include the delimiter or line breaks, and double a quote ("") to escape it inside a quoted field.

Is my data uploaded for conversion?

No. The conversion runs in this tab; a file you open is read by your browser and never transmitted. Sensitive spreadsheets stay sensitive.

CSV to JSON Converter

Turn spreadsheet rows into a clean JSON array — paste CSV or open the file, headers become keys.

Your CSV

…or open a .csv file

First row is headers

JSON —

How to use it

Paste CSV or open the file. Comma, semicolon and tab files are detected automatically; quoted fields are handled properly.

Confirm headers. Leave the box ticked if row one names the columns — those names become the JSON keys.

Convert, copy or download. The result is a pretty-printed JSON array, one object per row.

Spreadsheets speak CSV; the web speaks JSON

Every spreadsheet and database exports CSV, and every API, web app and config file wants JSON. The conversion looks trivial until the edge cases arrive: a notes field with a comma inside quotes, a European export using semicolons, a leading zero that must survive. This converter follows the actual CSV rules rather than splitting on commas and hoping, keeps every value a faithful string, and does it all in your browser — so the customer list or price sheet you are converting never crosses the internet to get formatted.

CSV to JSON Converter

How to use it

Spreadsheets speak CSV; the web speaks JSON

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