How to use it
- Paste your CSV into the input box, upload a .csv file, or drop a file onto the box.
- The JSON appears as you type. Change the indentation if you need to.
- Copy the result or download it as a .json file.
Good to know
- The first row is used as the header. Numbers and true/false become real numbers and booleans. Dotted headers such as supplier.city are rebuilt into nested objects, so converting back gives you the original shape.
About the formats
CSV
CSV (comma-separated values) stores a table as plain text: one row per line, with columns split by commas. Excel, Google Sheets and almost every database can import and export it.
JSON
JSON (JavaScript Object Notation) stores data as nested objects and arrays. It is the standard format for web APIs and the config files of most JavaScript projects.
Questions
- Is my data uploaded anywhere?
- No. The conversion runs in your browser with JavaScript. Your data never leaves your device, and the tool keeps working if you lose your connection after the page has loaded.
- How big a file can I convert?
- Up to 25 MB per file. Very large files depend on your device’s memory, so if the page slows down, split the file into parts.
- Can I convert JSON back to CSV?
- Yes. Use the JSON to CSV converter, or press the swap button above the editor.