AppsFactory

CSV ↔ JSON Converter

Convert between CSV and JSON formats instantly

Options

CSV Input

JSON Output

CSV to JSON Converter - Bidirectional Conversion Online

Convert between CSV and JSON formats instantly with our free online converter. Whether you need to transform spreadsheet data into a JSON array or flatten JSON objects into a CSV table, this tool handles it in both directions. Support for custom delimiters and quoted fields ensures accurate parsing of real-world data.

Features

  • Bidirectional conversion between CSV-to-JSON and JSON-to-CSV in a single tool
  • Custom delimiter support for tabs, semicolons, pipes, and any character you specify
  • Quoted field handling that correctly parses fields containing commas, newlines, and escape characters
  • Header row detection that automatically uses the first row as JSON property names
  • Nested JSON flattening that converts deeply nested objects into flat CSV columns using dot notation
  • Pretty-printed output with configurable indentation for readable JSON
  • Download and copy options to save the converted output as a file or copy it to your clipboard

How to Use

  1. Paste your CSV or JSON data into the input area, or upload a file using the file picker.
  2. Select the conversion direction: CSV to JSON or JSON to CSV.
  3. Configure options such as delimiter character, header row usage, and output formatting.
  4. Click "Convert" to generate the output instantly.
  5. Copy the result to your clipboard or download it as a .json or .csv file.

Use Cases

  • API integration: Convert CSV exports from spreadsheets into JSON payloads for REST API requests.
  • Data migration: Transform JSON database exports into CSV files for import into spreadsheet tools or SQL databases.
  • Reporting: Flatten nested JSON API responses into tabular CSV format for analysis in Excel or Google Sheets.
  • Development and testing: Quickly generate JSON fixtures from CSV test data or vice versa for unit tests.

FAQ

How does the tool handle nested JSON objects?

When converting JSON to CSV, nested objects are flattened using dot notation. For example, {"user": {"name": "Alice"}} becomes a column header user.name with the value Alice. Arrays are serialized as JSON strings within the CSV cell.

What happens if my CSV has inconsistent columns?

The tool uses the header row to define the expected columns. Rows with fewer fields will have empty values for the missing columns, and rows with extra fields will be truncated to match the header count. A warning is displayed if inconsistencies are detected.

Is there a size limit for the input data?

The tool processes data in your browser, so practical limits depend on your device's available memory. Files up to around 50 MB typically convert without issues on modern hardware.