How do I use the CSV to JSON converter?

1) Paste CSV data into the input box or drag & drop a CSV file; 2) Select delimiter and options (header row as keys, nested JSON, etc.); 3) Click Convert to see JSON results instantly. Copy or download the JSON output with one click.

What CSV formats are supported?

Standard CSV formats including comma-separated, tab-separated, semicolon-separated, and pipe-separated. Fields containing commas or newlines (wrapped in quotes) are handled correctly. Maximum file size: 10MB.

Absolutely. Everything runs locally: Delimiter and Output Format are processed on your device, never sent to a server. Your CSV data and conversion results are never uploaded to any server. The tool works offline and protects your data privacy.

Does it support nested JSON?

Yes. Enable the nested JSON option and column names with dots (e.g. 'user.name') will be automatically expanded into nested objects like {user:{name:value}}.

Can I convert large CSV files?

Yes. Upload CSV files up to 10MB. Each row is converted to a JSON object, with results displayed as a JSON array. For very large files, performance depends on your browser and device.

CSV to JSON Converter - Free Online Tool

← Home / CSV to JSON

📥 CSV Input

📁 Click or drag CSV file here (max 10MB)

⚙️ Options

Delimiter

Output Format

First row as headers

Nested JSON (dot-notation columns)

Trim whitespace

📤 JSON Output

📖 About CSV to JSON Converter

A free online tool to convert CSV (Comma-Separated Values) data to JSON format. Supports custom delimiters, header row as keys, nested JSON, and more. All computation happens on your device — Delimiter, Output Format and other inputs stay in your browser.

🎯 Key Features

Auto-detect delimiter: Smart detection of comma, tab, semicolon, and pipe separators
Header as keys: Use the first row as JSON object keys automatically
Nested JSON: Expand dot-notation column names into nested objects
Pretty print & minify: Format JSON output with one click
File support: Drag & drop CSV files up to 10MB

💡 Use Cases

API Development: Convert CSV data to JSON for API testing and mock data
Data Analysis: Transform Excel-exported CSV into JSON for programming
Database Import: Convert CSV data to JSON for NoSQL database import
Frontend Development: Convert CSV config files to JSON for web applications

📄 CSV to JSON Converter

📥 CSV Input Load Sample