CSV to JSON Converter
Upload or paste CSV data and convert it to JSON. Supports custom delimiters, header row detection, and nested object output. All processing in browser.
Why use a CSV to JSON Converter?
CSV is great for tabular data but most APIs, databases, and modern applications work with JSON. Converting CSV to JSON transforms rows into objects keyed by header names, making data immediately usable in JavaScript, Python, REST APIs, and NoSQL databases. This tool also infers data types — converting numeric strings to numbers and "true"/"false" to booleans automatically. Pair with the CSV viewer and JSON formatter in the data tools category.
Header-aware conversion
Uses the first row as object keys — each subsequent row becomes a JSON object with named properties matching the header.
Type inference
Numeric strings are converted to numbers, "true"/"false" strings become boolean true/false, keeping your JSON semantically correct.
Download as file
Download the JSON output as a .json file for use in projects, or copy it directly to the clipboard for immediate use.
Data type inference rules
The converter automatically detects and converts common data types. Understanding these rules helps you predict the JSON output.
| CSV value | Detected type | JSON output |
|---|---|---|
| 42 | Integer | 42 |
| 3.14 | Float | 3.14 |
| true / false | Boolean | true / false |
| (empty cell) | Empty string | "" |
| hello world | String | "hello world" |