Free CSV to JSON Converter

What is this CSV to JSON converter?

This free CSV to JSON converter helps developers, analysts, and QA teams turn spreadsheet-style data into clean JSON. Paste CSV or upload a file and get structured JSON you can use in API requests, seed data, configuration files, or tests. It supports common delimiters (comma, tab, semicolon, pipe), quoted fields with embedded commas or new lines, and basic type detection for numbers and booleans. Everything runs locally in your browser—no uploads, no servers.

How to use it

1. Paste your CSV into the input, or click Upload CSV to choose a file.
2. Leave Delimiter set to Auto, or pick a specific delimiter if you know it.
3. Keep “First row is header” on to produce key/value objects; turn it off to get arrays.
4. Click Convert to generate JSON on the right.
5. Copy the result or Download as a .json file for later.

Tips

• Quoted fields are supported, including commas and new lines inside quotes.
• Numbers and booleans are auto-cast; wrap values in quotes in your CSV to keep them as strings.
• Very large files are smoother via Upload CSV rather than paste.

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Privacy: runs entirely in your browser—no data is sent anywhere.