The CSV to JSON Converter transforms comma-separated value data into valid JSON format directly in your browser. CSV is the universal export format for spreadsheets, databases, and data tools, while JSON is the standard for web APIs, configuration files, and modern applications. Converting between them is one of the most common data tasks in development. This tool supports configurable delimiters (comma, semicolon, tab), optional header row detection, and produces either an array of objects (when headers are enabled) or an array of arrays. All conversion runs client-side — your data is never uploaded to any server, making it safe for confidential or sensitive information.
Result will appear here after conversion.
About CSV to JSON
CSV (Comma-Separated Values) files store tabular data as plain text with one record per line and fields separated by a delimiter. JSON (JavaScript Object Notation) structures data as nested objects and arrays, making it the format of choice for web APIs and modern application configs. Converting CSV to JSON enables you to feed spreadsheet exports into JavaScript applications, populate databases, seed test data, or build API request bodies. This tool parses your CSV following RFC 4180-style rules — quoted fields can contain commas, newlines, and escaped quotes — and outputs properly formatted JSON. Select your delimiter, toggle header detection, and get valid JSON in milliseconds.
How to Use CSV to JSON
- Select the Delimiter that matches your CSV (comma, semicolon, or tab).
- Check First row is headers if the first line contains column names (produces an array of objects); uncheck for an array of arrays.
- Paste your CSV data into the CSV input box.
- Click Convert to JSON. The formatted JSON appears in the output box.
- Use Copy JSON to copy the result. For the reverse conversion, use JSON to CSV.
Key Features
- Configurable delimiter — comma, semicolon, or tab to match your data source
- Header row detection for automatic object-key mapping
- RFC 4180-compliant parsing — handles quoted fields, embedded commas, and newlines
- Formatted JSON output with proper indentation for readability
- 100% browser-based — your data never leaves your device
- Bidirectional workflow with the JSON to CSV tool
When to Use This Tool
- Importing spreadsheet or database exports into a web application or API
- Building configuration files or seed data from Excel or Google Sheets exports
- Quick conversion without installing software or writing a parsing script
- Testing API endpoints that accept JSON payloads with sample data from CSV
- Data migration between systems that use different formats
Technical Details
The parser splits input by newlines, then processes each line character by character to handle quoted fields correctly. Double quotes within quoted fields are escaped as two consecutive double-quote characters (""). Empty rows are skipped. When "First row is headers" is enabled, the first row's values become the keys of each JSON object. The output is formatted with 2-space indentation using JSON.stringify(data, null, 2). All parsing runs in JavaScript with no external libraries or server calls.
Conclusion
The CSV to JSON Converter is a fast, reliable tool for transforming tabular data into JSON format. With flexible delimiter support and RFC-compliant parsing, it handles real-world CSV data accurately — all within the privacy of your browser.