CSV to JSON Converter
Convert CSV files to structured JSON arrays instantly - supports custom delimiters, validation, and pretty-printed output. A fast, browser-based CSV to JSON converter built for developers.
Features
Everything you need, nothing you don’t.
- Converts CSV to a JSON array of objects automatically as you type
- First row is treated as column headers - keys in the resulting objects
- Supports comma, semicolon, tab, and pipe delimiters
- Validates the CSV structure with clear error messages for row/field mismatches
- Pretty-prints JSON output with 2-space indentation
- Syntax-highlighted, collapsible JSON output
- One-click copy JSON output to clipboard
- Fullscreen editor mode for large files
- Works entirely in your browser - nothing is uploaded
Related Tools
Frequently asked questions
How does this CSV to JSON converter work?
The tool reads the first row of your CSV as column headers and maps each subsequent row to a JSON object using those headers as keys. The result is a JSON array where each item corresponds to one data row.
What delimiters are supported?
Comma (,), semicolon (;), tab, and pipe (|). Semicolons are common in European locale CSV exports. Change the delimiter to match your file before pasting - the conversion updates instantly.
Does it handle quoted fields with commas inside?
Yes. Fields enclosed in double quotes are parsed correctly, including fields that contain the delimiter, newlines, or embedded double quotes (""). This follows the RFC 4180 CSV standard.
Are all values returned as strings?
Yes. The tool maps each CSV cell to a string value. If you need numeric or boolean types, you will need to post-process the JSON - a deliberate choice that avoids ambiguous type coercion.
What happens if a row has a different number of fields than the header?
The tool reports an error for that row, showing the row number, the expected field count, and the actual count. This helps you locate and fix malformed rows quickly.
Can I convert a CSV file exported from Excel or Google Sheets?
Yes. Excel typically exports comma-separated UTF-8 or Windows-1252. If characters appear garbled, re-export from Excel as UTF-8 CSV. Google Sheets exports comma-separated UTF-8 by default, which works without adjustment.
Is my data sent to a server?
No. All conversion happens in your browser using JavaScript. Nothing is uploaded or stored anywhere.
Can I use this offline?
Yes. Once the page is loaded the tool works entirely offline - all logic runs locally in the browser.