CSV to JSON Converter
Convert CSV to JSON online free. Turn spreadsheet rows into a JSON array of objects, with headers as keys and numbers and booleans detected automatically.
About the CSV to JSON Converter
This tool converts CSV to JSON, turning each row into an object keyed by the header row. Numbers, booleans and nulls are detected rather than quoted as strings, so the output is ready to feed an API or load into code.
Convert CSV to JSON whenever tabular data has to reach something that speaks objects: seeding a database, posting to a REST API, loading fixtures into a test suite, or handing a spreadsheet export to a front end. The first row becomes the keys and every following row becomes one object in an array.
Type detection is what saves the follow-up work. A column of 1, 2, 3 arrives as numbers, true/false as booleans, and empty cells as null — rather than everything wrapped in quotes for you to cast later. Quoted fields containing commas, and fields containing line breaks, are parsed correctly.
This converter parses on the server, which is what lets it handle large exports without freezing a phone. If you would rather nothing left your machine, the data-tools CSV to JSON converter does the same job in the browser.
How to use the CSV to JSON Converter
- Add your CSV. Paste the CSV text or upload a .csv file.
- Convert. Run the conversion. The first row is read as the header and becomes the object keys.
- Check the JSON. Review the array of objects, including how numbers and booleans were typed.
- Copy or download. Copy the JSON to your clipboard or download it as a .json file.
CSV to JSON Converter features
- Header row becomes JSON object keys
- Automatic number, boolean and null detection
- Handles quoted fields containing commas
- Handles fields containing line breaks
- Paste text or upload a .csv file
- Copy to clipboard or download as .json
Frequently asked questions
How does the header row become keys?
The first CSV row is read as field names, so a column headed "email" produces an "email" key on every object.
Are numbers converted or left as strings?
They are converted. Numeric columns become JSON numbers, true/false becomes booleans and empty cells become null.
Does it handle commas inside quoted fields?
Yes. Quoted fields are parsed correctly, including ones containing commas or line breaks.
What if my CSV has no header row?
Add one before converting, otherwise the first data row is consumed as field names.
Is there a browser-only version?
Yes. The data-tools CSV to JSON converter does the same conversion without sending anything to a server.