CSV to JSON Converter — Free Online Tool
Convert CSV to JSON instantly in your browser. Handles headers, no uploads, fully private.
How to use
- Paste your CSV with a header row (first line = column names).
- Click Convert or press ⌘/Ctrl+Enter.
- Review the JSON on the right, then Copy JSON.
- Use Clear to start over, or Share to create a prefilled link.
Common pitfalls
- Commas inside values: wrap the value in quotes (
"hello, world"). - Quotes inside values: escape by doubling them (
"Alice ""The Ace"""). - Missing headers: this tool uses the first row as keys—add a header row.
- Extra columns: extra cells are ignored; missing ones become empty strings.
Example
CSV
name,notes Alice,"hello, world" Bob,"a,b,c"
JSON
[
{ "name": "Alice", "notes": "hello, world" },
{ "name": "Bob", "notes": "a,b,c" }
]About this tool
Turn CSV rows into JSON arrays of objects with one click. The first row is treated as headers.
Great for migrating spreadsheets into apps or fixtures.
FAQ
Is conversion done locally?
Yes. Everything runs in your browser; we do not upload your data.
Does it handle headers?
Yes. The first row is treated as headers and used as JSON keys.
What about commas inside quotes?
Use properly quoted CSV (RFC 4180 style) and it will parse correctly with quotes.
Is there a file size limit?
Only your browser memory and performance limit very large inputs.
Can I share a prefilled example?
Yes. Use the Share button—your CSV is embedded in the URL (?q=...).
Related tools