Back to Tools

CSV to JSON Converter - Transform Data Formats

Convert between CSV and JSON formats with custom delimiters and header options. Preview results and download or copy converted data.

Input CSV

Output JSON

🔄

Converted data will appear here

🔄 Bidirectional

Convert from CSV to JSON or JSON to CSV. Switch modes instantly and maintain your data structure.

⚙️ Customizable

Choose your delimiter (comma, semicolon, tab, pipe) and control header row handling for flexible conversion.

👁️ Preview

See a preview of your converted data in table format. Verify results before downloading or copying.

Free Online CSV to JSON Converter

Convert between CSV and JSON formats instantly with our free online converter. Perfect for data transformation, API integration, and database imports. All conversion happens locally in your browser for privacy and speed.

Why Convert Between CSV and JSON?

CSV (Comma-Separated Values) and JSON (JavaScript Object Notation) are two of the most common data formats. CSV is ideal for spreadsheets and tabular data, while JSON is perfect for APIs and web applications. Converting between formats allows you to use data across different systems and tools.

Features

  • Convert CSV to JSON with automatic header detection
  • Convert JSON to CSV with nested object flattening
  • Support for multiple delimiters (comma, semicolon, tab, pipe)
  • Preview converted data in table format
  • Download results as .json or .csv files
  • Copy to clipboard for quick use

Use Cases

  • Import CSV data into web applications
  • Export JSON API responses to spreadsheets
  • Transform data for database imports
  • Convert between data formats for analytics tools
  • Prepare data for visualization libraries
  • Migrate data between different systems

Nested Objects

When converting JSON to CSV, nested objects are automatically flattened using dot notation. For example, a JSON object like {"user": {"name": "John"}} becomes a CSV column named user.name.