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Check & prepare data · Supporting · Experimental helper

CSV to JSON

Turn CSV records into a JSON array using the first row as property names.

Private by designYour input stays on your device. Processing happens in this browser.
Your workspace

Start with a file

CSV, TSV, or TXT · UTF-8 only · up to 10 MB. Original text and identifiers are retained; parsing happens when you run. Drop here, or use the file picker.

Paste CSV instead (optional)

Optional alternative to a file. Editing this text removes its selected file; source text is never reformatted during loading.

Leave blank to detect comma, semicolon, tab, or pipe. Otherwise enter one character.
Ctrl / ⌘ + Enter to run
Result

A clear result starts here

Run the tool to see your output here.

Try the example to explore how it works.
What to know about this tool

10 MB and 50,000 rows; unique nonblank headers and rectangular records required. All cells stay strings, including leading-zero identifiers. Duplicate headers and missing/extra cells are rejected.

Clear this workspace?

Your inputs, selected files, and current result will be cleared.

Keep the task moving
Explore workflow →
Validate & format JSONCheck JSON syntax and create readable or compact output without rounding numeric identifiers.JSON to CSVConvert a JSON array of objects into a CSV with columns from their combined keys.CSV file previewExperimental helperPreview the header and first records of a CSV using quoted-field parsing.