How does the converter map a CSV to JSON?

It treats the first row as headers and every following row as data. The result is a JSON array of objects, where each object uses the column header as its key and the cell value as a string.

Does it convert numbers and booleans automatically?

No. No type coercion is applied, so a value like 007 stays "007" rather than becoming 7. If you need numbers or booleans, adjust the output after conversion.

Are my files uploaded to a server?

No. The conversion is JavaScript running on your own machine. The file is read into browser memory, transformed, and offered as a download, so nothing leaves your device.

Is it free, and do I need an account?

It is free with no watermarks, no daily caps, and no sign-up. Drop a file, convert it, and download the result.

Data conversion

Convert CSV to JSON

Drop a CSV file and get a JSON array back, each row mapped to an object, column headers as keys. The conversion runs entirely in your browser, so the file never leaves your device.

Switch to JSON → CSV

CSV JSON

Drop a file, click to choose, or paste

text/csv · application/vnd.ms-excel

Converted on your device. Nothing is uploaded.

About CSV to JSON

CSV is flat and tabular: every row has the same columns, every cell is a string. JSON can express nesting, arrays within arrays, and mixed types. This converter maps the straightforward case, a header row followed by data rows, to a JSON array of objects, where each object uses the column header as its key and the cell value as a string. No type coercion is applied, so a value like 007 stays "007", not 7. If you need numbers or booleans, adjust the output after conversion.

Round-trips are clean for flat data: CSV → JSON → CSV preserves all values. Nested JSON does not map back to CSV without loss. That direction is JSON to CSV, and it handles only arrays of flat objects.

Is it private?

Yes. The converter is JavaScript running on your own machine, with no server, no upload, no cloud storage. The file is read into browser memory, transformed, and offered as a download. Nothing leaves your device.

Frequently asked questions

How does the converter map a CSV to JSON?: It treats the first row as headers and every following row as data. The result is a JSON array of objects, where each object uses the column header as its key and the cell value as a string.
Does it convert numbers and booleans automatically?: No. No type coercion is applied, so a value like 007 stays "007" rather than becoming 7. If you need numbers or booleans, adjust the output after conversion.
Are my files uploaded to a server?: No. The conversion is JavaScript running on your own machine. The file is read into browser memory, transformed, and offered as a download, so nothing leaves your device.
Is it free, and do I need an account?: It is free with no watermarks, no daily caps, and no sign-up. Drop a file, convert it, and download the result.