Data / FREE ONLINE TOOL
Rows and columns.
Ready for your app.
Convert pasted CSV into readable JSON. Supports quoted commas, escaped quotes, multiline fields and optional headers.
Use this toolFree to use. No signup. Runs in your browser.
CSV to JSON Converter
Processed in your browserOne less thing
to fiddle with.
Spreadsheet data often needs to become JSON for an app or a handoff. With headers enabled, each data row becomes an object. Without headers, rows become arrays. Values stay as strings to protect leading zeros, long identifiers and date-like text.
- Paste CSV or choose a UTF-8 CSV file.
- Choose comma, semicolon or tab; indicate whether the first row contains headers.
- Convert, review any validation messages, then copy or download JSON.
Small questions.
Clear answers.
Can it handle commas inside quoted fields?
Yes. A quoted field can contain delimiters and line breaks. Use two quote characters inside a quoted field to represent a literal quote.
Are numbers automatically converted?
No. All cell values stay as strings, including “00123”, “true” and long numeric identifiers. Convert types deliberately in your app if needed.
What happens with missing fields or duplicate headers?
The tool reports an error. Rows must have the same number of fields, and header names must be nonempty and unique.
What size and encoding are supported?
Choose UTF-8 CSV files up to 1 MB, or paste up to 1,000,000 characters. A UTF-8 byte-order mark is handled. Legacy spreadsheet encodings may need to be exported as UTF-8 first.
Are my files or text uploaded?
No. The tool processes your input in this browser and does not send it to our server or save it in persistent browser storage. The website host still receives normal page requests. See our privacy notice for details.