Convert CSV data to JSON format. Free, private, runs in your browser.
CSV (Comma-Separated Values) is a plain-text tabular format where each row is a line and columns are separated by commas. JSON (JavaScript Object Notation) is a structured data format that represents data as nested objects and arrays. Both are ubiquitous in data processing, but they serve different ecosystems — CSV for spreadsheets, JSON for APIs and web applications.
APIs and web applications consume JSON, not CSV. If you have data exported from Excel, Google Sheets, or a database in CSV format and need to feed it into a web app, API, or JavaScript program, converting to JSON is essential. JSON also supports nested structures and typed values that flat CSV cannot represent.
Upload or paste your CSV data and Convertful parses the header row as keys and each subsequent row as a JSON object. The tool handles quoted fields, commas within values, and common CSV edge cases. The resulting JSON array is formatted and ready to copy. Everything runs in your browser — no data leaves your device.
Yes. Your CSV data is parsed and converted entirely in your browser. No files or text are uploaded to any server. This is important for datasets containing customer information, financial records, or proprietary business data.
The first row is used as object keys. Each subsequent row becomes a JSON object with those keys.
Comma, semicolon, and tab delimiters are auto-detected. You can also specify the delimiter manually.