JSON Formatter
Format, minify and validate JSON with useful syntax errors.
Developer toolsCSV to JSON
Convert robustly parsed CSV data to JSON locally.
Processed locally in your browser — your data is not uploaded.Loading your tool…
How to use CSV to JSON
- Paste CSV or choose a UTF-8 CSV file up to 5 MB.
- Confirm the detected delimiter and header-row setting.
- Convert, preview, copy or download the JSON.
Are quoted fields supported?
Yes. Quoted commas, escaped quotes and line breaks inside quoted fields are parsed by a bounded state-machine parser.
No sign-up is required. The calculation or transformation happens in this browser tab and the result is available immediately.
A useful next step
Cleaning and validating data locally in your browserSeparate syntax checks, text cleanup, encoding and integrity verification while keeping working data in the browser.Good to know
What delimiters are supported?+
Comma, tab, semicolon and pipe delimiters are supported, with automatic detection and manual selection.
How are duplicate headers handled?+
Duplicate or blank headers are rejected so values are never silently overwritten.
Is my input uploaded?+
No. Processing happens in this browser tab and the tool does not send your input or result to Metyris.