Convert CSV to JSON
Convert CSV to JSON locally in your browser.
Tool workspace
Convert CSV to JSON in your browser. The first row becomes object keys; each following row becomes one object in a JSON array. Quoted fields follow RFC 4180. Nothing you paste is uploaded.
How it works
Paste CSV, then Convert.
Conversion runs entirely in your browser. The first non-empty row is treated as headers (object keys). Each following row becomes one object in a pretty-printed JSON array. Fields are parsed per RFC 4180 (commas, quoted values, doubled quotes, newlines inside quotes). A leading UTF-8 BOM is stripped. Missing columns are padded with empty strings; extra cells beyond the header count are ignored. Duplicate header names overwrite earlier keys in the same row. All values remain strings—no type inference.
Empty input clears the result—no error. Header-only CSV yields []. Unclosed quotes show a clear parse error. Nothing you paste is uploaded.
Conversion runs entirely in your browser. The first non-empty row is treated as headers (object keys). Each following row becomes one object in a pretty-printed JSON array. Fields are parsed per RFC 4180 (commas, quoted values, doubled quotes, newlines inside quotes). A leading UTF-8 BOM is stripped. Missing columns are padded with empty strings; extra cells beyond the header count are ignored. Duplicate header names overwrite earlier keys in the same row. All values remain strings—no type inference.
Empty input clears the result—no error. Header-only CSV yields []. Unclosed quotes show a clear parse error. Nothing you paste is uploaded.
Examples
- name,age → [{"name":"Alice","age":"30"},…]
- "Hello, ""world""" → quoted commas and quotes
- Header-only CSV → []
Privacy
Privacy: this tool processes CSV locally in your browser. We do not log or store what you paste. Login is not required.
FAQ
Is my CSV uploaded?
No. Conversion runs entirely in your browser. We do not log or store what you paste.
Are numbers converted to JSON numbers?
No. Every cell value remains a string in the JSON output for predictable, lossless conversion.
Do I need an account?
No. All published tools work for guests without login.