Convert CSV to JSON

Convert CSV rows into a JSON array with explicit headers and optional type inference.

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Paste or choose your input

Your input stays in this browser while the tool runs.

CSV or TSV text · 5 MB text / 24 megapixels image

Processed on this device. No file upload.

CSV inputChoose input file

Adjust your outputInfer numbers, booleans and nullOff keeps every CSV value as a string, including leading zeros.

How to use Convert CSV to JSON

Choose a CSV file or paste CSV text.
Use the first row as headers and optionally infer numbers and booleans.
Download the JSON array.

Duplicate or empty headers are rejected so a column cannot be silently overwritten.

What stays private, and what are the limits?

Input is processed in this browser and is not uploaded by the tool. Text and CSV inputs are limited to 5 MB; images to 24 megapixels. Your original input is never overwritten. Optional page measurement follows your analytics choice and excludes file names and contents.

Another local task?

Crop image Remove image metadata Extract image palette Clean CSV

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Link to this tool: https://www.toolpick.dev/free-tools/csv-to-json