// FREE IT TOOLS

CSV to JSON Converter

Convert CSV to JSON instantly. RFC 4180 compliant with quoted fields, multiline cells, and graceful error handling — all processed in your browser.

// EXAMPLES

// CSV INPUT

Nothing is sent to the server — all processing happens in your browser.

// JSON OUTPUT

Paste CSV in the input panel to get started

What is CSV?

CSV (Comma-Separated Values) is a simple text format for storing tabular data. Each line represents a row, and fields within a row are separated by commas. RFC 4180 defines the standard CSV format, which includes rules for quoting fields that contain commas or line breaks, and escaping quotes by doubling them.

This converter uses a pure JavaScript RFC 4180 compliant parser to transform CSV input into structured JSON output. It handles quoted fields, multiline cells, and irregular row lengths — all without sending your data to any server.

Why Convert CSV to JSON?

API Integration:Modern REST APIs consume and produce JSON, not CSV. Converting CSV to JSON lets you import spreadsheet data into APIs, webhooks, and cloud services without manual reformatting.
Structured Data:JSON preserves data types (numbers, booleans, nulls) natively, whereas CSV stores everything as text. Converting to JSON ensures your booleans stay true/false and your numbers stay numeric.
No-Code Tools:Automation platforms like Zapier, Make, and n8n work best with JSON. Converting CSV exports from CRMs, accounting software, or databases into JSON unlocks seamless no-code integrations.

Frequently Asked Questions

Is my data sent to a server?: No. All conversion happens entirely in your browser using JavaScript. Your CSV data never leaves your device. Nothing is transmitted over the network.
What CSV standard does this tool follow?: The parser is RFC 4180 compliant, which means it correctly handles quoted fields, escaped quotes (doubled quotes), commas inside quoted fields, and line breaks within cells.
What happens if rows have missing or extra columns?: The converter gracefully handles irregular rows. Missing fields are filled with empty strings, and extra fields are preserved in the output JSON. You will see a warning if row lengths do not match the header.
Can the tool produce nested JSON from flat CSV?: No. CSV is inherently flat — there is no standard way to represent nested objects or arrays in a CSV file. The converter produces a flat array of objects, one per row. If you need nested structures, you will need to transform the flat JSON output in your application code.

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What is CSV?

Why Convert CSV to JSON?

API Integration:Modern REST APIs consume and produce JSON, not CSV. Converting CSV to JSON lets you import spreadsheet data into APIs, webhooks, and cloud services without manual reformatting.
Structured Data:JSON preserves data types (numbers, booleans, nulls) natively, whereas CSV stores everything as text. Converting to JSON ensures your booleans stay true/false and your numbers stay numeric.
No-Code Tools:Automation platforms like Zapier, Make, and n8n work best with JSON. Converting CSV exports from CRMs, accounting software, or databases into JSON unlocks seamless no-code integrations.

Frequently Asked Questions

Is my data sent to a server?

No. All conversion happens entirely in your browser using JavaScript. Your CSV data never leaves your device. Nothing is transmitted over the network.

What CSV standard does this tool follow?

The parser is RFC 4180 compliant, which means it correctly handles quoted fields, escaped quotes (doubled quotes), commas inside quoted fields, and line breaks within cells.

What happens if rows have missing or extra columns?

The converter gracefully handles irregular rows. Missing fields are filled with empty strings, and extra fields are preserved in the output JSON. You will see a warning if row lengths do not match the header.

Can the tool produce nested JSON from flat CSV?

No. CSV is inherently flat — there is no standard way to represent nested objects or arrays in a CSV file. The converter produces a flat array of objects, one per row. If you need nested structures, you will need to transform the flat JSON output in your application code.