CSV to JSON Converter

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JSON Output

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Paste or upload CSV to convert to JSON

All processing happens locally in your browser. No data is sent to any server.

Frequently Asked Questions

How does this CSV to JSON converter work?

Paste or upload your CSV data, and the tool instantly parses it into JSON format. It automatically detects the delimiter (comma, semicolon, tab, or pipe) and header row. Each row becomes a JSON object with column headers as keys.

What delimiters are supported?

The converter supports comma (,), semicolon (;), tab, and pipe (|) delimiters. By default, it auto-detects the delimiter used in your CSV file. You can also manually specify the delimiter in the settings.

Can it create nested JSON from flat CSV?

Yes! Use the "Nested Structure" output mode. If your CSV headers use dot notation (e.g., user.name, user.email), the converter will create nested JSON objects automatically.

How are data types detected?

The converter intelligently infers data types from your CSV values. Numbers, booleans (true/false), dates (ISO format), and null values are automatically converted to their proper JSON types. You can disable type inference to keep everything as strings.

What output formats are available?

Four output modes are available: Array of Objects (default), Single Object (keyed by a column), Nested Structure (for dot-notation headers), and Grouped (group rows by a column value).

Is my data secure?

Absolutely. All processing happens 100% in your browser using JavaScript. Your CSV data never leaves your device and is not sent to any server.