CSV to
JSON
Convert CSV data to JSON instantly. Supports custom delimiters, quoted fields, and header rows.
How It Works
Add CSV
Upload a CSV file or paste your CSV data directly.
Configure
Choose your delimiter and header row settings.
Get JSON
Copy or download the converted JSON instantly.
Convert CSV to JSON online with support for custom delimiters, quoted fields, and configurable headers. ConverterUp's CSV to JSON converter is built for analysts importing spreadsheets into APIs, developers seeding databases, and product managers turning exports from Notion or Google Sheets into structured data. Paste a CSV or upload a file, pick the delimiter and header options, and download the resulting JSON array or copy it to the clipboard. Parsing runs in your browser using a streaming RFC 4180 parser, so customer lists and confidential exports never reach a third-party server.
Frequently asked questions
Which delimiters are supported?
Comma, semicolon, tab, pipe, and a custom field where you can type any single character. Auto-detect inspects the first lines and picks the delimiter that produces the most consistent column count.
How are quoted fields and escaped quotes handled?
ConverterUp follows RFC 4180: fields wrapped in double quotes can contain commas and newlines, and a literal double quote inside a quoted field is escaped as two double quotes. Excel and Google Sheets use the same rules.
What is the maximum CSV size?
Up to 50 MB per file. The streaming parser keeps memory usage low, so even files with hundreds of thousands of rows convert without crashing the browser tab.
Can I get an array of objects instead of arrays?
Yes. Enable the header option and the first row is used as JSON keys, producing an array of objects. Disable it to get an array of arrays, useful when the source has no header or you want positional access.