CSV to JSON Converter
CSV to JSON Converter is a free data tool that runs directly in your browser with no account required.
About this tool
Convert CSV data into a JSON array of objects using the first row as keys. The parser correctly handles quoted fields containing commas, escaped quotes, and even multiline values, and the result is downloadable with row, column, and size stats.
How to use
- Paste your data into the CSV field, keeping the header row first.
- Review the metrics for rows, columns, and output size.
- Copy the JSON from the output, or click the download button to save converted.json.
Frequently asked questions
How are commas inside values handled?
Fields wrapped in double quotes are parsed correctly, including embedded commas, doubled quotes ("") as escapes, and line breaks inside a quoted field.
What structure does the output have?
A JSON array with one object per data row. Keys come from the trimmed header row, and every value is a trimmed string; numbers are not auto-converted to numeric types.
Why do I get an error about rows?
The converter needs a header row plus at least one data row. A lone header or empty input cannot produce objects.
What if a row has fewer cells than the header?
Missing cells become empty strings under the corresponding keys, so every object has the full set of header keys.
Does it strip a byte-order mark?
Yes. A leading UTF-8 BOM, common in files exported from Excel, is removed before parsing so the first header name stays clean.
Where is my data processed?
Entirely in your browser. The CSV you paste and the JSON produced never touch a server, so customer exports stay on your machine.