CSV to JSON Converter

How to Use the CSV to JSON Converter

This free online tool converts between CSV (Comma-Separated Values) and JSON (JavaScript Object Notation) formats. In CSV-to-JSON mode, paste your CSV data with headers in the first row, and the tool generates a JSON array of objects. In JSON-to-CSV mode, paste a JSON array of objects, and the tool produces properly formatted CSV output. Click Convert and copy the result with one click. All processing happens entirely in your browser, so your data remains private and secure.

Understanding CSV and JSON

CSV is a simple, widely-supported tabular data format where each line represents a row and values are separated by commas. It is the standard export format for spreadsheets, databases, and analytics tools. JSON is a hierarchical data format used extensively in web APIs, configuration files, and modern applications. Converting between these formats is a common task when importing data from spreadsheets into web applications, exporting API responses to spreadsheets, or migrating data between systems.

Handling Special Characters

This tool properly handles quoted CSV fields, commas within values, double-quoted characters, and multi-line values. When converting JSON to CSV, values containing commas, quotes, or newlines are automatically wrapped in double quotes following the RFC 4180 standard. This ensures that your converted data maintains its integrity regardless of the content within individual fields.

Tips for Clean Conversions

For CSV-to-JSON conversion, ensure your first row contains column headers that will become the JSON property names. Avoid spaces in header names when possible, as they become object keys. For JSON-to-CSV conversion, provide a flat array of objects where each object has the same keys. Nested objects or arrays in JSON will be converted to their string representation. For best results, flatten complex JSON structures before converting to CSV format.

CSV・JSON相互変換ツールについて

CSVとJSON形式をブラウザ上で即座に相互変換できるツールです。引用符やカンマを含むフィールドにもRFC 4180準拠で対応し、変換結果をワンクリックでコピーできます。スプレッドシートとWebアプリ間のデータ変換に便利です。