CSV to JSON Converter Online
Convert CSV data to JSON format instantly in your browser. This free tool parses your CSV client-side, so your spreadsheet data never leaves your device.
CSV ↔ JSON Converter
Convert between CSV and JSON formats. Handles quoted fields, custom delimiters, and nested commas.
About CSV ↔ JSON Conversion
- Handles quoted fields with commas, newlines, and escaped quotes (
""). - Supports custom delimiters: comma, tab, semicolon, and pipe.
- CSV → JSON uses the first row as object keys (headers).
- JSON → CSV flattens objects into columns — nested objects are stringified.
- Everything runs in your browser — no data is sent over the network.
What is CSV to JSON conversion?
CSV (Comma-Separated Values) is a flat tabular format, while JSON (JavaScript Object Notation) is a hierarchical structured format. Converting CSV to JSON transforms each row into a JSON object, using the header row as keys. This makes the data ready for use in web applications, APIs, and NoSQL databases that expect structured JSON input.
Common use cases for CSV to JSON conversion
Developers convert CSV to JSON when importing spreadsheet data into web applications, loading data into MongoDB or other document databases, creating API mock data, or building data visualizations with JavaScript libraries like D3.js or Chart.js. It is also useful for transforming data exports from tools like Excel or Google Sheets.
Frequently Asked Questions
How are CSV headers handled during conversion?
The first row of your CSV is used as the keys for each JSON object. Each subsequent row becomes a JSON object with those keys mapped to the corresponding cell values.
Can I convert CSV files with custom delimiters?
Yes. While the default delimiter is a comma, you can also use tab-separated (TSV), semicolon-separated, or pipe-separated files. The tool auto-detects common delimiters.