CSV to JSON Converter

Convert CSV data to a JSON array of objects. First row is used as headers.

CSV Input

JSON Output

About This Tool

CSV (Comma-Separated Values) is one of the oldest and most universal data formats. Nearly every spreadsheet application, database, and data tool can read and write CSV. Converting CSV to JSON is essential when you need to feed tabular data into web applications, REST APIs, or NoSQL databases.

The conversion process maps each row to a JSON object, using the header row to define the keys. This tool intelligently detects numeric values and converts them to JSON numbers rather than strings, while preserving empty fields as null values.

Typical use cases include importing spreadsheet data into web applications, preparing data for MongoDB or CouchDB import, transforming exported analytics data for visualization libraries, and bridging legacy CSV-based systems with modern JSON APIs.

Frequently Asked Questions

How are CSV headers used?

The first row of the CSV is treated as column headers. Each subsequent row becomes a JSON object with those headers as keys.

Are quoted fields handled?

Yes. The parser correctly handles fields wrapped in double quotes, including fields that contain commas, newlines, or escaped double quotes (doubled).

Are numbers auto-detected?

Yes. Fields that look like valid numbers are converted to JSON numbers. Empty fields become null. Everything else stays as a string.

What about large CSV files?

Since this runs entirely in your browser, very large files (50MB+) may be slow. For massive datasets, consider using a command-line tool.