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JSON Toolbox- Free online JSON tools

CSV to JSON

Convert CSV to a JSON array of objects online. The header row becomes keys and values are type-inferred automatically.

  • 100% client-side, nothing uploaded
  • Instant results
  • Works offline once loaded
Input CSV

Empty

JSON output

Empty

How it works

About this tool

This CSV to JSON converter parses delimited text into a clean JSON array. The first row is treated as the header, and each following row becomes an object whose keys come from that header.

The parser is quote-aware, so fields that contain commas, quotes, or newlines inside double quotes are handled correctly. Numbers, booleans, and null are detected automatically and converted to real JSON types instead of strings, and you can pick the delimiter used in your file.

Typical uses include turning spreadsheet exports into API fixtures, seeding databases, or preparing data for JavaScript tooling.

Parsing happens entirely client-side. Your CSV never leaves your browser, so it is safe for sensitive exports and large files alike.

JSON Toolbox processes all data locally in the browser. Nothing is uploaded to a server.

Common questions

Frequently asked questions

How do I convert CSV to JSON?
Paste your CSV (or load a file), confirm the delimiter matches your file, and the JSON array appears on the right. Copy or download it when you are ready.
Does the first row have to be a header?
Yes. The first row is used as the object keys for every following row. If a header cell is empty, a fallback name like column1 is used.
Are numbers and booleans converted?
Yes. Values that look like numbers, true/false, or null are converted to the matching JSON type. Anything else stays a string, so IDs with leading zeros are preserved as text.
Is my CSV uploaded anywhere?
No. Parsing is fully client-side. Your spreadsheet export never leaves your device.

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