Developer Utility

CSV to JSON

Paste a CSV file, detect the delimiter, and turn each row into valid JSON without sending data off the page.

Use the first row as object keys or generate numbered columns automatically. Output can be pretty-printed, minified, copied, or downloaded as a .json file.

Built for quick, clean transforms

  • Quoted-field parsing
  • Delimiter auto-detect
  • Header normalization
  • Copy and download actions

Assumptions: the parser follows common CSV quoting rules with double quotes for escaped quotes. Empty cells become empty strings, and duplicate headers are made unique.

Convert your CSV

Choose a file or paste raw CSV below. The converter runs locally in your browser and updates the JSON output when you click convert.

Ready for CSV input.

CSV input

JSON output

0 rows
0 columns
Auto delimiter
Array output shape

How it works

Parsing rules

The converter reads the CSV one character at a time so quoted fields can safely include commas, tabs, line breaks, and escaped double quotes. If you leave the delimiter on auto-detect, the tool scores common separators on the first non-empty rows and picks the most consistent match.

Header behavior

When header mode is enabled, the first row becomes object keys. Blank or repeated labels are normalized into safe unique names such as column_2 and status_2. When header mode is off, each row becomes an array.

Rounding and values

No numeric coercion is applied by default. Every cell is preserved as text so IDs, ZIP codes, leading zeros, and mixed-format columns stay intact. JSON indentation only affects formatting, not the underlying data.