Turn CSV into clean JSON in your browser. Works offline once loaded; your data stays on your device.
FeedbackTurn a spreadsheet export into a clean JSON array. The parser follows RFC 4180, so quoted fields containing commas, quotes or line breaks survive intact, and numbers, booleans and null are restored as real JSON types. Everything runs in your browser, so the file never leaves your device.
Paste your CSV, or copy it straight out of Excel, Google Sheets or Numbers.
Keep the first row as your header row: it becomes the keys of each JSON object.
Leave 'Detect numbers and booleans' on to get real JSON types, or turn it off to keep every value as text.
Press Convert, then copy the JSON or download it as a .json file.
CSV is what spreadsheets and analytics tools export, but APIs, config files and JavaScript all expect JSON. Converting between the two is the small chore that sits between a data export and actually using it in code.
A field like "Doe, John" keeps its comma instead of splitting into two columns.
42 becomes a number and true becomes a boolean, so you do not have to cast every value afterwards.
The conversion happens in your browser, so customer data or exports never reach a server.
Convert JSON to CSV in your browser and download the file. Your data never reaches a server.
Format, validate and minify JSON in your browser. Paste, prettify, copy: nothing is uploaded.
Validate JSON and jump to the exact line and column of each error, locally in your browser.