CSV to JSON Converter
Convert between CSV and JSON formats instantly. Parse CSV with header rows into JSON arrays of objects, or flatten JSON arrays back to CSV. Supports custom delimiters and quoted fields. All processing runs locally in your browser.
CSV to JSON
Paste your CSV data below to convert it to a JSON array of objects.
JSON to CSV
Paste a JSON array of objects below to convert it to CSV format.
How CSV to JSON Conversion Works
CSV (Comma-Separated Values) stores tabular data as plain text, with each row on a new line and values separated by a delimiter. JSON (JavaScript Object Notation) represents structured data as key-value pairs. Converting between them bridges the gap between spreadsheet-style data and modern APIs.
When converting CSV to JSON, the first row is used as property names (headers) and each subsequent row becomes a JSON object. When converting JSON to CSV, all unique keys across the array become column headers and each object becomes a row.
Common Use Cases
- Importing spreadsheet data into APIs — Convert exported CSV files from Excel or Google Sheets into JSON payloads for REST APIs.
- Exporting API data to spreadsheets — Turn JSON API responses into CSV format for analysis in Excel, Google Sheets, or database imports.
- Data migration — Move data between systems that use different formats, such as from a legacy CSV-based system to a modern JSON-based application.
- Configuration management — Convert tabular configuration data into JSON for use in application config files.
Frequently Asked Questions
How does CSV to JSON conversion work?
The converter reads your CSV data, uses the first row as property names (headers), and maps each subsequent row into a JSON object where keys come from the headers and values from the corresponding cells. The result is a JSON array of objects.
Can this tool handle quoted fields with commas?
Yes. Fields enclosed in double quotes are treated as a single value, even if they contain the delimiter character (comma, semicolon, or tab). Escaped quotes inside quoted fields are also supported.
What delimiters are supported?
The converter supports comma (,), semicolon (;), and tab delimiters. Select the appropriate delimiter from the dropdown before converting your data.
Is my data secure when using this converter?
Yes. All conversion happens entirely in your browser using JavaScript. Your data is never uploaded to any server, ensuring complete privacy and security.