Data Converters

CSV to JSON Converter

Paste a CSV table or upload a file and get clean, well-structured JSON in one click. Header detection, type inference (numbers, booleans, null), and pretty-printing are all built in. Nothing leaves your browser.

Auto-detects delimiters Browser-only Pretty or compact JSON
CSV JSON
Paste CSV below, or drop a file
Options

Converted entirely in your browser; your data never leaves your device

Features

  • Auto-detects headers from the first row
  • Type inference converts '30' to 30 and 'true' to true
  • Pretty-print or compact output toggle
  • Upload .csv files or paste raw CSV directly
  • One-click copy or .json download
  • Handles quoted fields, commas inside quotes, and UTF-8

How to use it

  1. Paste your CSV into the input panel or click Upload to load a .csv file.
  2. Check 'First row is header' if your CSV has column names.
  3. Enable 'Infer types' to convert numbers and booleans automatically.
  4. Click Convert, JSON appears instantly in the output panel.
  5. Copy to clipboard or click Download .json.

Use cases

  • Feeding spreadsheet exports into a JavaScript or Python app
  • Migrating database table dumps to a JSON API format
  • Turning Google Sheets exports into config files
  • Preparing test fixtures from Excel data

Limitations

  • Very large CSV files may be slow on older devices.
  • Malformed CSV may need cleanup before it can be converted cleanly.
  • The tool keeps values as text instead of guessing numeric or date types.
See also

Related tools

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Format and beautify JSON online. Paste minified or messy JSON and get clean, 2-space indented output with syntax validation, instant, in-browser, no upload.

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JSON to YAML

Convert JSON to YAML online. Paste any JSON object or array and get clean, human-readable YAML with proper indentation. Processed locally, nothing uploaded.

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Questions & answers

Frequently asked

Does it handle CSV with commas inside quoted fields?

Yes. RFC 4180-compliant quoting is supported. Fields wrapped in double quotes can contain commas and newlines.

What is type inference?

When enabled, numeric strings become JSON numbers, 'true'/'false' become booleans, and empty fields become null instead of empty strings.

Is my data uploaded anywhere?

No. The conversion runs entirely in your browser using JavaScript. Your CSV never touches a server.

What is the maximum file size?

There is no enforced limit. Processing is constrained only by available browser memory, which handles files up to several hundred MB on modern devices.