CSV to JSON Converter - Free Online Tool

Basic Conversion

CSV Input:

name,email,role
Alice Johnson,[email protected],Admin
Bob Smith,[email protected],User

JSON Output (Array of Objects):

[
  {
    "name": "Alice Johnson",
    "email": "[email protected]",
    "role": "Admin"
  },
  {
    "name": "Bob Smith",
    "email": "[email protected]",
    "role": "User"
  }
]

Nested JSON Output

Use “/” delimiters in column headers to create nested JSON structures:

CSV Input:

user/name,user/email,settings/notifications
Alice,[email protected],true

JSON Output (Nested):

[
  {
    "user": {
      "name": "Alice",
      "email": "[email protected]"
    },
    "settings": {
      "notifications": true
    }
  }
]

Custom Delimiters

Process CSV files with different separators:

• Comma (,) – Standard CSV format
• Semicolon (;) – Common in European locales where comma is decimal separator
• Tab (\t) – TSV (Tab-Separated Values) format
• Pipe (|) – Often used for data exports containing commas in values

Common Use Cases

API Development & Testing

Convert spreadsheet data to JSON format for API mock data, test fixtures, or seed data. Developers frequently use CSV exports from Excel or Google Sheets to quickly generate JSON payloads for REST API testing and development.

Database Migration

Transform legacy CSV exports into JSON for importing into MongoDB, CouchDB, or other NoSQL databases. Many database migration tools accept JSON as input, making CSV-to-JSON conversion a critical step in data modernization projects.

Data Analysis & Visualization

Convert tabular data exports to JSON for use with D3.js, Chart.js, or other JavaScript visualization libraries. JSON’s hierarchical structure makes it ideal for representing complex datasets in web-based dashboards and analytics tools.

Configuration Management

Transform configuration data from spreadsheets into JSON config files for applications. Teams often maintain configuration in CSV for easier bulk editing, then convert to JSON for deployment.

Frequently Asked Questions

Is my data secure when using this converter?

Yes, absolutely. All CSV to JSON conversion happens entirely in your browser using JavaScript. No data is uploaded to any server, ensuring complete privacy and security for sensitive data.

What’s the maximum file size I can convert?

The tool can handle files with thousands of rows efficiently. Practical limits depend on your browser’s memory, but most CSV files under 10MB convert smoothly. For extremely large datasets, consider splitting into smaller files.

Can I convert JSON back to CSV?

While this tool focuses on CSV-to-JSON conversion, many converters offer bidirectional conversion. Check our developer tools page for a complete list of available converters.

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