CSV to JSON Converter Online Free
The free CSV to JSON Converter turns any CSV file into a structured JSON array in seconds. Each header column becomes an object key, and each data row becomes an object in the array. No server, no upload, no signup required.
How to Convert CSV to JSON
- Open the CSV to JSON Converter.
- Paste your CSV data into the input panel, or upload a
.csvfile. - The JSON output appears instantly in the right panel.
- Click Copy to copy the JSON, or Download to save as a
.jsonfile.
How the Conversion Works
| CSV Element | JSON Equivalent |
|---|---|
| Header row | Object keys for every row |
| Data row | JSON object in the output array |
| Quoted fields | String values (quotes stripped) |
| Empty cell | Empty string "" |
| Numeric cell | JSON number (no quotes) |
Handling Common CSV Variations
Comma-separated vs semicolon-separated
CSV files exported from European versions of Excel often use semicolons as delimiters instead of commas, because commas are used as the decimal separator in those locales. The converter detects the delimiter automatically.
Quoted fields with commas
Fields that contain commas are enclosed in double quotes in standard CSV. For example:"Smith, John". The parser handles quoted fields correctly, treating the comma inside quotes as part of the field value rather than a column separator.
No header row
If your CSV has no header row, the converter generates generic key names —column0, column1, and so on. You can rename these in the JSON after conversion.
Use Cases
- Importing spreadsheet data into a web application or database
- Feeding CSV exports from Google Sheets or Excel into a JSON API
- Transforming report data for use in JavaScript
- Pre-processing data before loading into a document database like MongoDB
To go in the reverse direction, use the JSON to CSV Converter. For XML transformations, see the JSON to XML Converter.
Convert CSV to JSON Free Online
Instant structured JSON from any CSV. No uploads, no account required.
Open CSV to JSON Converter