CSV to JSON
Convert CSV data to JSON format. Supports custom delimiters, headers, and quoted fields — all in your browser, no upload, instant results.
About the CSV to JSON Converter
This CSV to JSON converter runs entirely in your browser. Paste CSV data into the box above, pick a delimiter, choose whether the first row is a header, and click Convert. The result appears as formatted JSON. Nothing is uploaded to a server — the conversion happens instantly with JavaScript on your device.
About the CSV format
CSV (Comma-Separated Values) is a plain-text format for storing tabular data. Each line is a row, and each field is separated by a delimiter (usually a comma). Fields that contain the delimiter, a quote, or a newline must be wrapped in double quotes, and any internal double quotes are escaped by doubling them ("").
Parsing rules
- Delimiters — Choose comma, semicolon, tab, or pipe to match your input.
- Quoted fields — Fields wrapped in double quotes may contain the delimiter and newlines.
- Escaped quotes — A doubled double-quote inside a quoted field (
"") is treated as a literal quote character. - Header row — When enabled, the first row becomes the object keys for each subsequent row.
- No header — When disabled, the output is an array of arrays.
Common use cases
- Importing spreadsheet data into a JavaScript application.
- Transforming exported database tables for use in APIs.
- Preparing configuration files from tabular data.
- Quick inspection of CSV files during development.
Frequently asked questions
Does this tool upload my CSV? No. All conversion happens locally in your browser. Your data never leaves your device.
What happens to empty lines? Completely empty lines are skipped, so trailing newlines do not produce empty rows.
Are numbers converted to numeric types? No. To preserve all data faithfully, every value is kept as a string. You can cast types in your own code afterwards.
Is there a size limit? The only limit is your browser's available memory. Even large CSV files convert quickly.