CSV to JSON
Convert delimited rows into JSON records.
CSV input
JSON output
About CSV to JSON
Turn CSV or TSV into an array of JSON objects with automatic delimiter detection, header handling, and optional type coercion so numbers and booleans do not arrive as strings.
CSV is what systems export and JSON is what applications consume, so this conversion sits between almost every spreadsheet and almost every script.
An array of objects, with the delimiter detected for you.
- Processed on your deviceEverything you open or type here is handled by this page and never uploaded anywhere.
- No queue, no limitsNothing waits on a server, so the only limit is your own hardware.
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How CSV to JSON works in your browser
PapaParse reads the file, detecting whether it is comma, tab or semicolon separated from the content itself, and handling quoted fields, escaped quotes and line breaks inside cells — the cases that break a naive split and that appear constantly in real exports.
The header row becomes the object keys. Values can be kept as strings or type-inferred into numbers and booleans; inference is convenient and occasionally wrong, and the case to watch is an identifier of digits that becomes a number and loses its leading zeros.
Rows with more or fewer fields than the header are reported rather than silently padded, because a row count that does not match is usually a quoting problem earlier in the file rather than a genuinely short record.
When to use it
Turning an export into seed data or a test fixture. Feeding spreadsheet data into an API that expects JSON. Converting a data file for a script without writing a parser. Processing a file of personal records without uploading it to a converter.
Frequently asked questions
Will numbers come through as numbers?
With type coercion enabled, yes — numbers and booleans are converted rather than arriving as strings. Turn it off when you need every value preserved verbatim.
Do I need to specify the delimiter?
No. It is detected from the file, so comma, tab, semicolon and pipe separated files all work without configuration.
What if my file has no header row?
Header handling is configurable. Without one you get arrays of values rather than objects with named keys.