Convert CSV data into clean JSON in your browser. Paste CSV text or upload a .csv file, choose the output format, then copy or download the generated JSON.
Paste your CSV data into the input area or load a .csv file. The tool parses rows and columns automatically. Click Convert to generate JSON output. You can choose between array-of-objects or array-of-arrays format. Copy the result or download it as a .json file.
By default, the first row of CSV is used as property names (keys) in the JSON output. Each column header becomes a key, and subsequent rows populate the corresponding values. If your CSV does not have a header row, the converter generates generic keys like "column_1", "column_2", and so on.
CSV is inherently a flat, tabular format and cannot natively represent nested objects or arrays. This converter produces a flat JSON array of objects. For nested structures, you would need to preprocess your CSV data using dot-notation column headers (e.g., "address.city") or use a dedicated transformation tool after conversion.
Yes. The parser fully supports RFC 4180 standard CSV, including fields enclosed in double quotes, commas and newlines within quoted values, and escaped quotes (represented as ""). This means data like "Smith, John" or multi-line addresses will be parsed correctly without splitting into separate columns.
Absolutely. All processing happens entirely in your browser. Your CSV data is never uploaded to any server or third-party service. Once you close the tab, the data is gone. This makes the tool safe for converting sensitive datasets including personal information, financial records, and proprietary business data.
Empty rows are automatically skipped during conversion. If a row has fewer values than the header defines, the missing fields are set to empty strings. If a row has more values than headers, the extra values are ignored. This graceful handling prevents JSON errors from malformed CSV input.
Yes. You can toggle "Pretty print" to switch between indented, human-readable JSON and compact single-line output. The "Parse numbers" option automatically converts numeric strings (e.g., "42") into JSON numbers instead of leaving them as strings. For more advanced customization, download the JSON and use a formatter or template engine.
Since processing runs in your browser, the limit depends on your device's available memory. Most modern browsers handle CSV files up to 50–100 MB comfortably. For very large datasets, consider splitting the file into smaller chunks before conversion, or use a server-side processing tool.
No. All our tools are free to use and work directly in your browser without registration or sign-in. Just open the page and start using the tool.
Yes. The tool is fully responsive and works on any modern browser on iPhone, iPad, Android phones and tablets. The interface adapts to your screen size automatically.