Free Online CSV to JSON & JSON to CSV Converter
CSV Input
JSON Output
Convert between CSV and JSON formats instantly with this free online tool. Whether you need to transform CSV data for APIs, convert JSON responses to spreadsheets, or migrate data between systems, this bidirectional converter handles all common delimiters and data structures.
All conversion happens in your browser for complete privacy. No data is uploaded to any server, ensuring your sensitive information stays secure. Perfect for developers, data analysts, and anyone working with different data formats.
How to Use This CSV/JSON Converter
- 1Select your conversion mode: "CSV to JSON" or "JSON to CSV" from the dropdown.
- 2Paste your data into the input panel or upload a CSV/JSON file based on your selected mode.
- 3Choose your delimiter (comma, semicolon, tab, or pipe) and configure header options.
- 4Click "Convert" to transform your data into the desired format instantly.
- 5Use "Validate" to check if your input is valid before conversion.
- 6Copy or download the converted output for use in your project.
Features
Bidirectional Conversion
Convert CSV to JSON or JSON to CSV with a simple mode selector. Switch between formats instantly.
Multiple Delimiters
Support for comma, semicolon, tab, and pipe delimiters. Automatically detect or manually select your delimiter.
Header Management
Handle CSV headers automatically or generate column names. Include or exclude headers in output as needed.
Quoted Value Support
Properly handles quoted CSV values containing commas, newlines, or special characters.
File Upload
Upload CSV or JSON files directly from your computer for quick conversion based on your selected mode.
Copy & Download
Copy converted output to your clipboard or download it as a `.csv` or `.json` file with one click.
Input Validation
Validate your CSV or JSON input before conversion to catch syntax errors early.
Customizable Formatting
Choose indentation size for JSON output and delimiter type for CSV output to match your project standards.
About CSV and JSON Conversion
CSV (Comma-Separated Values) and JSON (JavaScript Object Notation) are two of the most popular data formats used in data processing, APIs, and data exchange. CSV is widely used in spreadsheets and data analysis tools, while JSON is the standard format for modern web APIs and configuration files.
Converting between CSV and JSON is essential when working with APIs that return JSON but need to import data into Excel or Google Sheets, when exporting spreadsheet data for API consumption, or when migrating data between different systems and applications.
This converter intelligently handles various CSV delimiters (comma, semicolon, tab, pipe), quoted values, and nested structures. It preserves data types, handles special characters, and maintains data integrity during conversion in both directions.
CSV/JSON Converter FAQs
Is this CSV/JSON converter safe to use?
Yes. The conversion runs entirely in your browser. Your data is never uploaded or stored on any server, ensuring complete privacy and security.
Does this tool save my data?
No. Once you refresh the page or close the tab, your input is cleared. Nothing is persisted or cached beyond your session.
Can I convert both CSV to JSON and JSON to CSV?
Yes! This is a bidirectional converter. Simply select your desired conversion mode from the dropdown menu - "CSV to JSON" or "JSON to CSV" - and the tool will adapt accordingly.
What CSV delimiters are supported?
The converter supports comma (,), semicolon (;), tab, and pipe (|) delimiters. You can select your delimiter from the dropdown menu before conversion.
How are CSV headers handled?
When converting CSV to JSON, you can choose whether your CSV has headers. Headers become JSON object keys. When converting JSON to CSV, you can choose to include or exclude headers in the output.
What happens to special characters in CSV values?
Special characters, commas, and newlines within CSV values are properly handled through quoting. The converter automatically escapes and unescapes quoted values during conversion.
Can I convert nested JSON structures to CSV?
The converter works best with flat JSON arrays of objects. Nested objects and arrays will be converted, but complex nested structures may require flattening for optimal CSV output.
What file formats are supported for upload?
You can upload `.csv` files when in CSV to JSON mode, and `.json` files when in JSON to CSV mode. The tool automatically validates the file type based on your selected conversion mode.