The CSV to JSON Converter transforms comma-separated values into a JSON array of objects. It automatically detects which row contains the column headers by finding the row with the most populated columns — so files exported from Google Ads, Excel, or other tools that include a report title or filter rows above the real headers just work. Numbers and booleans are automatically coerced to their native JSON types, so 42 becomes a number and true becomes a boolean rather than strings.
1. Paste CSV data into the input box, click Upload to load a file, or click Sample to try an example.
2. Select the delimiter that matches your data (comma is standard CSV).
3. The JSON output generates automatically as you type. The status bar shows which row was auto-detected as the header.
4. If the output looks wrong — for example, a report title was picked up instead of the real headers — change the Header row number to the correct row and the tool will re-convert instantly.
5. Click Download JSON to save the file, or Copy Output to paste it elsewhere.
What CSV structure does this tool expect?
The tool expects one row to be a header row containing column names. Each subsequent row becomes a JSON object where the keys are the header values. Empty rows are skipped.
Which delimiters are supported?
Comma (standard CSV), semicolon (common in European locales), tab (TSV), and pipe. Choose the one that matches your data using the delimiter buttons.
What happens with quoted fields?
Quoted fields are handled correctly, including fields that contain the delimiter character or line breaks inside quotes. Double-quoted escape sequences ("") within quoted fields are also resolved.
My file has extra rows at the top before the real headers — what do I do?
The tool automatically detects which row is the real header by finding the row with the most columns. If it guesses wrong, use the "Header row" spinner to manually set the correct row number. Row 1 is the first row in the file.
Can I upload a CSV file instead of pasting?
Yes — click the Upload button to load any .csv or .txt file directly from your device. The file is read in your browser and never sent to a server.
Is my data sent to a server?
No. All conversion happens in your browser using JavaScript. Your CSV data never leaves your device.