CSV to JSON

Convert CSV/TSV data into JSON with header detection.

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CSV input
JSON output

What is CSV to JSON conversion?

CSV (comma-separated values) is the lingua franca of spreadsheet exports — Excel, Google Sheets, almost every database speaks it. JSON is the lingua franca of web APIs. Converting between them is the first step in countless data pipelines: importing a customer list, hydrating fixtures for tests, or feeding a chart library.

What this tool does

  • Delimiter auto-detection — figures out commas, tabs, semicolons, or pipes from your data.
  • RFC 4180 compliant — handles quoted fields, escaped quotes (""), and newlines inside quoted values.
  • Header row — toggle on to produce an array of objects; toggle off for an array of arrays.
  • Type parsing — convert numeric strings to numbers and true/false to booleans.

Tips

  • If your file has UTF-8 BOM characters, paste them as-is — the parser strips them automatically.
  • Tabs are visible delimiters in TSV files; choose Tab if auto-detect picks the wrong one.
  • For very large CSVs, prefer a streaming parser at the command line; this tool is designed for inspection-sized data.

Parsing happens in your browser — no row is sent to a server.

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