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CSV to JSON Converter

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About CSV to JSON Converter

The CSV to JSON and JSON to CSV converter transforms data between the two most common data interchange formats instantly. Convert CSV files to JSON arrays of objects, or convert JSON arrays back to CSV with proper header rows.

The CSV parser handles all standard CSV features: quoted fields (including those containing commas and newlines), escaped quotes, custom delimiters (comma, semicolon, tab, pipe), and automatic data type detection for numbers, booleans, and null values.

This tool is useful for data engineering, API testing, spreadsheet import/export, database migrations, and transforming data between tools that accept different formats.

Everything runs in your browser. Your data never leaves your device.

How to Use CSV to JSON Converter

  1. Paste your CSV or JSON into the input.

  2. Select the direction: CSV → JSON or JSON → CSV.

  3. Choose a delimiter for CSV output (comma, semicolon, tab, or pipe).

  4. Copy the converted result.

Examples

Example — CSV → JSON
Input
name,age,city
Alice,30,New York
Bob,25,London
Output
[{"name":"Alice","age":30,"city":"New York"},{"name":"Bob","age":25,"city":"London"}]
Example — JSON → CSV
Input
[{"name":"Alice","age":30},{"name":"Bob","age":25}]
Output
name,age
Alice,30
Bob,25

Frequently Asked Questions

Does it handle CSV files with quoted fields?

Yes — fields containing commas, newlines, or quotes are handled correctly as long as they follow RFC 4180 CSV quoting rules.

Does it auto-detect data types?

Yes — numbers, booleans (true/false), and null values are automatically detected and represented as their native JSON types rather than strings.

Can I use a semicolon or tab as the CSV delimiter?

Yes — select the delimiter in the output options. For tab-delimited (TSV) output, choose the tab delimiter.

What is the expected format for JSON → CSV conversion?

The JSON input should be an array of objects, where all objects share the same keys. The keys become the CSV header row and the values fill the rows.

Can I handle large CSV files?

Yes — the parser runs in your browser and can handle large CSV files without any server upload.