CSV To JSON Converter Online
Convert CSV to JSON and JSON to CSV instantly. Supports custom delimiters (comma, semicolon, tab, pipe).
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About CSV to JSON Converter Online
Convert CSV data to JSON format and JSON arrays back to CSV. Supports comma, semicolon, tab, and pipe delimiters. Handles quoted fields, custom headers, and large datasets.
CSV and JSON are the two most common data interchange formats, but they represent data very differently — CSV is flat rows and columns, while JSON supports nested structures — which means converting between them isn't always a trivial one-to-one mapping, especially with nested objects or arrays that need to be flattened using dot-notation or expanded from dotted CSV headers. This conversion comes up constantly for developers importing spreadsheet exports into an API, data analysts prepping CSV files for a JSON-based pipeline, or anyone moving data between a spreadsheet tool and a JavaScript application. This tool handles comma, semicolon, tab, and pipe-delimited CSV automatically and correctly reconstructs nested JSON from dot-notation headers.
How to use
- Paste or type your input directly into the editor — output updates in real time as you work.
- Check the error/status indicator if your input is invalid; it points to the exact line or issue where relevant.
- Use the copy or download button to grab the processed output once it looks right.
- Chain into a related tool below if your workflow needs a second processing step.
- Processing happens entirely client-side in your browser — nothing you paste is uploaded to a server.
Tool details
⚡ Next step — complete your workflow
Frequently asked questions
Does it handle commas inside CSV fields?
Yes. Fields with commas are handled when wrapped in double quotes as per RFC 4180 CSV specification.
What is the maximum file size?
Browser-based processing handles most CSV files well. For very large files (>10MB), consider server-side processing.
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