QuietJSON

CSV to JSON Converter

Convert CSV data to JSON, then copy or download the result.

How CSV to JSON Conversion Works

Exporting tables from spreadsheets like Excel or Google Sheets produces CSV files, but web APIs, modern applications, and databases require JSON format. QuietJSON parses the first row of your CSV as column keys and converts every subsequent record into a structured JSON object.

Unlike basic split-by-comma tools, QuietJSON implements a full RFC 4180 compliant tokenizer. Quoted cells with inner commas, embedded newlines, and escaped quotes ("") are accurately resolved without breaking rows or shifting column alignments.

How to Use

  1. Paste your CSV data into the left editor or click Upload .csv to load a file.
  2. Choose whether to automatically parse numeric and boolean types.
  3. Click Convert to JSON (or click Sample CSV to test with example data).
  4. Click Copy to copy the JSON array to your clipboard, or ↓ Download to save as a data.json file.

Frequently Asked Questions

Does QuietJSON support RFC 4180 CSV files with commas and newlines in cells?

Yes. QuietJSON's CSV parser strictly complies with RFC 4180. Cells enclosed in double quotes can contain commas, escaped quotes ("" rendered as a single quote), and multiline text with line breaks without misaligning table columns.

How does the converter handle numbers and boolean types?

By default, QuietJSON automatically detects and parses numeric and boolean values into native JSON numbers (42, 3.14) and booleans (true, false, null). If a number exceeds JavaScript's safe integer limit (9007199254740991), it is preserved as a string to prevent precision rounding loss. You can also uncheck 'Parse numbers' or 'Parse booleans' to keep all values as strings.

What happens if my CSV has duplicate column headers?

QuietJSON automatically disambiguates duplicate column names (for example, turning repeated 'score' columns into 'score' and 'score_2') so that later columns never silently overwrite preceding data in the output JSON objects.

Is my CSV data sent to any server?

No. All conversion is executed 100% client-side inside your browser via local JavaScript. No CSV content, headers, or records are ever transmitted over the network.

Need the Reverse or Other Formats?

Explore QuietJSON's full suite of developer tools:

JSON to CSV →JSON to YAML →JSON Diff →JSON Formatter & Validator →