Developer tools
CSV to JSON Converter
Convert CSV rows into JSON records locally in your browser without uploading your data.
Browser-only data converter
Convert CSV rows into JSON records.
Paste comma-separated values. Quoted commas, escaped double quotes, and line breaks inside quoted fields are supported. Your data stays in this browser.
With headers enabled, the first row becomes each JSON object’s keys. Without headers, keys are named column1, column2, and so on. Rows must have the same number of columns.
Ready to convert CSV.
Turn spreadsheet-style rows into structured JSON.
Paste CSV to create JSON records with header names or generated column keys. The converter supports quoted commas, escaped quotes, and line breaks inside quoted fields, entirely in your browser.
Frequently Asked Questions
Everything you need to know about this tool, how it works, and privacy.
How does this CSV to JSON converter handle headers?
When the first-row headers option is enabled, the first CSV row supplies each JSON object’s keys. Header names must be non-empty and unique. Turn the option off to generate keys named column1, column2, and so on.
Can it convert quoted commas, quotes, and line breaks?
Yes. Fields wrapped in double quotes can contain commas and line breaks. Use two double quotes inside a quoted field to represent one literal double quote, as defined by common CSV conventions.
What happens when CSV rows have different numbers of columns?
The converter stops and shows an error. Every row must have the same number of columns as the first row so the resulting JSON records are predictable.
Does my CSV leave my browser?
No. Parsing, conversion, copying, and downloading happen locally in your browser. CodeASystem does not upload or store the CSV data you paste.