CSV to JSON Converter — Instant, Free & Secure
Convert CSV data to JSON instantly — paste text or upload a .csv file. Supports comma, semicolon, and tab delimiters, custom headers, and pretty or minified output. Your data never leaves your browser.
How to Convert CSV to JSON Online
Frequently Asked Questions
How do I convert CSV to JSON in JavaScript?
In JavaScript, you can split the CSV by newlines, then map each row to an object using header keys. However, this tool handles edge cases like quoted values with commas inside, empty fields, and type coercion — saving you the time of writing it yourself.
What is the difference between CSV and JSON?
CSV (Comma-Separated Values) is a flat tabular format ideal for spreadsheets. JSON (JavaScript Object Notation) is a hierarchical data format ideal for APIs and web applications. JSON is more flexible and supports nested structures.
Can this tool handle large CSV files?
Yes. The conversion runs entirely in your browser with no server upload, so it can process large files limited only by your device's memory. For very large files (50MB+), processing may take a few seconds.
Does it handle quoted CSV fields with commas inside?
Yes. The parser handles fields wrapped in double quotes, including fields that contain commas, newlines, or double quotes (escaped as ""), following RFC 4180 CSV specification.
What output format should I use?
Array of Objects is best for most use cases (each row becomes a JSON object with named keys). Array of Arrays is more compact. Keyed by First Column creates a lookup object where the first column's values become keys.
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🔒 All conversions run 100% in your browser. Your CSV data is never uploaded or stored.