Convert CSV to JSON and back β free
Spreadsheets speak CSV; apps and APIs speak JSON. This free converter moves your data between the two in both directions, right in your browser. Paste a CSV exported from Excel or Google Sheets to get clean JSON, or paste a JSON array to get a CSV you can open in any spreadsheet. No installs, no signup, and your data never leaves your device.
It handles the awkward parts properly: quoted fields with commas, line breaks inside cells, escaped quotes, custom delimiters and header rows. You can choose pretty (readable) or minified JSON, and download the result as a file. It's built for developers, analysts, students and anyone who works with data exports.
How to use it
- Pick a direction: CSV β JSON or JSON β CSV.
- Paste your data, or upload a .csv / .json file.
- Set the delimiter, whether the first row is a header, and pretty vs minified.
- Click Convert, then Copy or Download the result.
CSV to JSON
With the header option on, the first row becomes the keys and every following row becomes a JSON object β so name,age followed by Ali,25 turns into {"name":"Ali","age":"25"}. With headers off, each row becomes a simple array of values instead. This is ideal for feeding spreadsheet data into a JavaScript app, a config file or an API request.
JSON to CSV
Paste an array of objects and the tool collects every key it sees across all objects to build a complete header row, then writes one line per record. Values containing commas, quotes or new lines are automatically wrapped in quotes so the columns stay intact. It's the quickest way to turn an API response or a database export into a spreadsheet-ready file.
How quoting and delimiters work
CSV looks simple but has tricky edge cases. A value like "Lahore, Punjab" contains a comma, so it must be quoted to avoid splitting into two columns; a quote character inside a value is escaped by doubling it. This converter follows those standard rules in both directions. If your file uses semicolons (common in Europe) or tabs (TSV), just switch the delimiter to match.
CSV vs JSON β when to use each
CSV is a flat, table-like format: rows and columns, easy to open in Excel or Google Sheets, perfect for tabular data and bulk imports. JSON is structured and nested: it can hold lists inside objects, supports real data types, and is the language of web APIs and config files. A good rule of thumb is CSV for spreadsheets and data exchange with non-technical tools, and JSON for code, APIs and anything with nested structure. This converter lets you hop between the two whenever a tool on one side only speaks the other.
Private and free
All processing happens locally with JavaScript, so even sensitive work data stays on your machine β nothing is uploaded or logged. There are no limits, no accounts and no watermarks. Use it as often as you need on any device with a modern browser.