CSV to JSON Converter

The converter handles standard CSV with comma delimiters, double-quoted fields (including escaped quotes), and multiline fields. It auto-detects the header row as the first line and maps values accordingly.

Yes, the tool processes data locally in your browser with no file size limits beyond your system's memory. For files up to ~50MB, performance is near-instant. Very large datasets may take a moment.

The converter expects a consistent number of columns per row. If some rows have fewer or more columns than the header row, extra columns are ignored and missing columns become undefined or null. For irregular CSVs, clean your data first or use a data cleaning tool.

The converter defaults to comma delimiters per the RFC 4180 standard. For tab-separated values (TSV), pipe-delimited, or semicolon-delimited files, convert them to comma-separated first or use the "auto-detect delimiter" option. Most spreadsheet apps export to standard CSV format.

The output is a JSON array of objects. The first row becomes the object keys, and each subsequent row becomes an object with those keys as property names. The JSON is pretty-printed with 2-space indentation for readability. You can copy it directly into any JavaScript, Python, or API code.

Fields wrapped in double quotes are treated as a single value, including commas and newlines within them. Double-quote characters inside quoted fields are escaped with another double-quote (""), which the parser correctly unescapes.