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CSV to JSON Converter

Convert CSV data to JSON format instantly. Paste your CSV, choose a delimiter, and get clean JSON output with support for quoted fields and custom separators.

Developer Tool

Paste your CSV data here. Quoted fields with commas and newlines are supported.

Paste your CSV data above to see the JSON output in real time

How to Use

  1. 1Paste your CSV data into the input area, with the first row as column headers.
  2. 2Select the delimiter if it is not a comma (supports tab, semicolon, and pipe).
  3. 3Click Convert to transform the CSV into a JSON array of objects.
  4. 4Review the JSON output with proper types (numbers are parsed as numbers, not strings).
  5. 5Copy the JSON for use in your application, API, or database.

About This Tool

The CSV to JSON Converter turns comma-separated (or tab/semicolon/pipe-separated) data into a JSON array of objects, using the first row as property keys. It handles quoted fields, escaped characters, and automatic type detection.

Spreadsheet data often needs to be imported into web applications, APIs, or NoSQL databases that expect JSON. Manually building JSON from CSV rows is a recipe for syntax errors and mismatched brackets. This tool handles the conversion instantly, including proper escaping and type coercion.

The delimiter detection is flexible — paste data from Excel (tab-separated), European CSVs (semicolon-separated), or log files (pipe-separated) and select the matching delimiter. The converter handles quoted fields that contain the delimiter character, so a field like "Smith, John" remains a single value.

Automatic type detection converts numeric strings to numbers and recognizes boolean values. A CSV cell containing "42" becomes the number 42 in JSON, not the string "42". This saves you from manual type conversion when importing data into typed systems. All processing runs locally in your browser.

Tips & Best Practices

  • ✓Ensure your first row contains clean column headers with no spaces or special characters — these become JSON property keys and messy headers create messy output.
  • ✓If your CSV uses semicolons (common in European locales), select the semicolon delimiter option instead of comma.
  • ✓Verify numeric fields converted correctly. Zip codes like "01234" and phone numbers should typically remain strings, not be parsed as numbers.

Frequently Asked Questions

How does the CSV to JSON converter handle special characters?▼
The converter fully supports RFC 4180 CSV parsing. Fields containing commas, newlines, or double quotes can be enclosed in double quotes. Double quotes within a quoted field are escaped by doubling them (e.g., "" becomes a single "). This ensures all special characters are preserved correctly in the JSON output.
Can I convert large CSV files to JSON?▼
This tool runs entirely in your browser, so the size limit depends on your device memory. It works well for CSV files up to several megabytes. For extremely large files (100MB+), consider using a command-line tool or a server-side solution to avoid browser memory limits.
What happens if my CSV does not have a header row?▼
If you uncheck the "First row is header" option, the converter will output an array of arrays instead of an array of objects. Each inner array represents one row of data, with values in the same order as the CSV columns.
Does the converter support nested or hierarchical JSON output?▼
CSV is a flat data format, so the converter produces flat JSON objects or arrays. If you need nested structures, you can convert to flat JSON first, then use a JSON editor or script to reshape the data into your desired nested format.
What encoding does the CSV to JSON converter support?▼
The tool works with any text that your browser can handle, which is typically UTF-8. If your CSV file uses a different encoding (like ISO-8859-1 or Windows-1252), convert it to UTF-8 first using a text editor or encoding tool before pasting it here.

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