Result appears here after you select
{ } How to use
- Paste your CSV with the column names on the first line.
- Select Process to turn each remaining line into an object.
- Copy the JSON, or download it as a .json file.
{ } How it works
CSV to JSON works on the text you provide. Select Process ▸ and it runs entirely in your browser — nothing is uploaded to a server — then shows the result in the Output panel.
Input
- CSV input — paste or type your input in the left panel (use Sample for an example)
Output
JSON — copy it, download it, or switch the Output panel to Tree view to explore it.
{ } Common uses
- Turn a spreadsheet export into a test fixture or a seed file.
- Feed tabular data to an API or a script that expects JSON.
- Inspect a CSV as structured data in the tree view.
{ } Limitations
- The first line is always read as the header. A file without one loses its first row of data to the column names.
- Every value comes out as a string. Numbers, booleans and dates are not guessed at, because a column of 01 or TRUE means different things in different files.
- Fields must be separated by commas: a semicolon-separated file will not split correctly, and a tab-separated one belongs in TSV to JSON.
{ } FAQ
Is my data uploaded to a server?
No. Everything runs locally in your browser — your files never leave your device.
Can I process more than one file at once?
This tool works on one input at a time.
Is this tool free?
Yes — it’s completely free and needs no sign-up.
Why are my numbers wrapped in quotes?
CSV carries no types, so every cell is kept as text rather than converted on a guess. Convert the columns you know are numeric afterwards.
What happens to two columns with the same name?
They collide, and the last one wins. Rename the header before converting.