CSV to JSON — Free Online Tool
Paste CSV text or upload a .csv file and convert it to a JSON array of objects, with column headers as keys. Automatically infers data types (numbers, booleans, nulls) and shows a live preview table of the first 10 rows before you download the result.
100% client-side. No uploads. Your data never leaves your browser.
How to use CSV to JSON
- Paste CSV text or drop a .csv file into the input area.
- The tool auto-detects the delimiter (comma, semicolon, tab).
- A preview table shows the first 10 rows — verify the parse looks correct.
- Click 'Download JSON' to save the result, or 'Copy' to use it directly.
Frequently Asked Questions
How are column types inferred?
PapaParse is used for parsing. It detects numbers, booleans (true/false), and empty values (null) automatically. You can disable this with the 'all strings' option.
Does this handle quoted fields with commas?
Yes. PapaParse correctly handles RFC 4180 compliant CSV, including quoted fields containing commas, newlines, and escaped quotes.
What is the output structure?
An array of objects where each object represents a row, with column headers as keys. E.g. [{"name": "Alice", "age": 30}, ...]
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