CSV to JSON

Fast, private CSV → JSON conversion with auto-delimiter detection. Runs 100% in your browser.

Converter

Upload CSV/TSV file

Drop CSV/TSV here
.csv, .tsv, .txt • Max few MB (client-side only)

Tip: You can also paste CSV into the textarea below.

Paste CSV

Sample

Parsing options

Delimiter

Auto counts separators in first lines.

Quote character

Header row

Trim whitespace

Empty cells → null

Preserve number types

Sanitize column names

Output mode

Row limit (preview)

JSON formatting

JSON Output

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How it works

Paste CSV or drop a file. The tool detects the delimiter (comma, semicolon, tab or pipe), handles quoted fields (with escapes like ""), and converts to JSON in your browser. Choose headers on/off, trim, cast numbers, and pick array-of-objects or array-of-arrays output. Nothing is uploaded.

FAQs

Is this free and private?

Yes. It runs entirely on your device — no servers, no uploads.

How are numbers handled?

Enable “Preserve number types” to auto-cast integers/floats. Turn it off to keep values as strings.