Data
Turn your CSV files into JSON in seconds. Everything happens in your browser: nothing is uploaded to any server.
Drag your files here
Or paste them with Ctrl+V. They never leave your device.
Turn a CSV table into JSON for a web app, a script or an API: each row becomes an object with the column names.
It has a single sheet, no formatting or formulas, and accented characters sometimes break. As JSON any program or API can use it directly.
CSV stores a table as text: one row per line with columns separated by commas (or semicolons in some locales).
Strengths: Every spreadsheet, database and app can import it.
Limits: It has a single sheet, no formatting or formulas, and accented characters sometimes break.
JSON is the data format of APIs and web apps: nested lists and objects as text.
Strengths: Every programming language reads it and it is easy to validate.
Limits: For a person, a table in JSON is harder to read than a spreadsheet.
No. The CSV to JSON conversion runs entirely in your browser, with code downloaded from this site and executed on your device. You can check it in the Network tab of the developer tools or by going offline after the page loads.
Open the options and pick the “Windows (Western European)” encoding, which older Excel versions use for CSV. UTF-8 files are detected automatically.
Up to 1 GB on desktop and about 200 MB on mobile, although a huge spreadsheet may take a few seconds.
Yes. Drop as many CSV files as you like: several are converted at the same time, depending on your processor cores, and when they finish you can download each JSON or all of them in a ZIP.