Local data workspace
CSV to JSON Converter
Convert CSV, TSV, semicolon, or pipe data to JSON with header controls, type inference, null handling, table preview, import, copy, and download.
No upload · No account · Runs in this browser · Updated 2026-08-03
Delimited data workspace
Ready
Input
CSV, TSV, and more
Auto-detect comma, tab, semicolon, or pipe delimiters. Quoted delimiters, escaped quotes, byte-order marks, uneven rows, and local text files are supported.
Output
Choose the JSON shape
Export an array of objects, an array of arrays, or an object keyed by one column. Keep everything as text or infer JSON primitives.
Review
See the table first
Preview the first 20 rows before copying or downloading. Type inference is deliberately optional because values such as ZIP codes can look numeric but are identifiers.
FAQ
Does the converter require a header row?
No. Keep the header option on to use the first row as object keys, or turn it off to generate column_1 style names or an array-of-arrays output.
Does this support quoted CSV fields?
It supports common quoted fields, quoted commas, and escaped quotes for lightweight conversion, and it reports an unclosed quoted field as an error.
Can I use this for quick online CSV to JSON conversion?
Yes. Paste data or open a local file up to 5 MB, review the table preview, then copy or download the JSON. It is not a replacement for a streaming data pipeline.
What should I check before copying the JSON?
Confirm the header names, review blank cells, spot-check rows with commas or quotation marks, and make sure missing cells are acceptable.