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CSV to JSON Converter

Convert CSV data to JSON with header detection, custom delimiter support, and automatic type inference.

CSV to JSON Converter — Turn Spreadsheet Data into JSON

CSV (Comma-Separated Values) is the most common format for exporting data from Excel, Google Sheets, databases, and analytics platforms. JSON is what modern APIs and JavaScript applications consume. RealJSON's free CSV to JSON converter bridges that gap instantly — no server, no installation.

How It Works

Paste CSV text or upload a .csv file. The converter:

  1. Detects the header row and uses the column names as JSON keys
  2. Parses each subsequent row into a JSON object
  3. Outputs a JSON array of objects — ready to copy into code or an API

Flexible Conversion Options

Custom Delimiters

Not all CSVs use commas. The converter supports tab-separated (TSV), semicolon-separated, and pipe-separated formats — common exports from European locale Excel files and database tools.

Header Row Detection

Toggle whether your first row contains column names. If it does, those names become the JSON keys. If not, keys default to col1, col2, etc.

Automatic Type Inference

Numbers stay numbers and true/false values become proper JSON booleans — not strings. The JSON output works correctly in JavaScript without extra parsing or casting.

Common Use Cases

  • Importing database exports into a Node.js or Python application
  • Migrating data between a spreadsheet and a JSON-based API
  • Preparing test fixtures from real-world data exports
  • Converting analytics reports for front-end visualization libraries

Related Tools

After converting, use the JSON Viewer to explore the result as a tree, or the JSON Formatter to pretty-print it. If your data source is XML instead of CSV, the XML to JSON converter handles that format.

Browse all free JSON tools →

Related tools

JSON Viewer JSON Formatter XML to JSON