About this tool
CSV (Comma-Separated Values) is the universal export format for spreadsheets and databases, but JSON is what most web apps, APIs and scripts actually consume. Bridging the two by hand is tedious and error-prone, especially when quoted fields or embedded newlines are involved.
DataFmt's CSV to JSON tool is built on top of the widely-adopted PapaParse engine, which handles quoting, escaped separators, multi-line fields and byte-order marks correctly. Paste your CSV text or drop in a .csv file, pick a few options, and you will get well-formed JSON instantly — all computed inside your browser.
Because nothing is uploaded to a server, the tool is safe to use on customer data, internal reports and any other content you cannot share with third parties.
How to use
- Paste your CSV text into the left panel, or upload a .csv file.
- Toggle "First row is header" on to produce an array of objects keyed by column name. Toggle it off to get a 2-D array.
- Enable "Pretty print" to format the JSON with 2-space indentation.
- Click "Convert". The result appears on the right and can be copied or downloaded.
Use cases
- Turn spreadsheet exports into JSON mock data for frontend development.
- Feed CSV dictionaries from partners into Node.js or Python pipelines.
- Embed structured sample data into API documentation or blog posts.
Notes
- If your file is tab- or semicolon-separated, switch the delimiter option accordingly.
- Fields containing commas or newlines must be wrapped in double quotes — this is the standard CSV escape.
- For files larger than tens of megabytes, consider splitting them locally before conversion for best performance.