ブラウザでCSVデータをJSON形式に即座に変換。無料、プライベート、サーバーアップロードなし。カスタム区切り文字とヘッダーオプションをサポート。
CSVファイルをドラッグ＆ドロップするか、クリックして参照
Our CSV to JSON Converter is a free, client-side tool that transforms Comma-Separated Values (CSV) data into JavaScript Object Notation (JSON) format instantly in your browser. CSV is the universal format for spreadsheets, databases, and data exports, while JSON is the standard for modern APIs, web applications, and NoSQL databases. This converter bridges the gap between these two formats, allowing you to paste CSV data or upload a file and receive clean, properly structured JSON output within seconds. All processing happens entirely in your browser: your data is never uploaded to any server, ensuring complete privacy and security. The tool supports advanced features like custom delimiter selection (comma, semicolon, tab, or pipe), automatic header detection, whitespace trimming, and flexible empty value handling.
CSV to JSON conversion transforms tabular data stored in Comma-Separated Values format into JavaScript Object Notation (JSON). JSON is a lightweight, text-based format that is easy for humans to read and write and easy for machines to parse and generate. It is widely used for APIs, configuration files, and data exchange between web applications.
Yes, our CSV to JSON converter is completely free with no usage limits, no signup required, and no ads.
Absolutely. All CSV processing happens entirely in your browser using JavaScript. No data is sent to any server, ensuring complete privacy and security for sensitive data.
We support comma, semicolon, tab, and pipe delimiters. You can select the delimiter that matches your CSV file format.
Yes, since all processing is done client-side, you can convert large CSV files limited only by your browser memory.
Yes, our CSV parser correctly handles quoted fields, including fields that contain commas, line breaks, or other special characters within the quotes.
Pretty Print formats the JSON with indentation and line breaks, making it easy to read and debug. Minified removes all unnecessary whitespace, resulting in a smaller file size ideal for production APIs and data transmission.
Yes, simply click the Download button and the result will be saved as a .json file. You can also use the Copy button to copy the result to your clipboard.