CSV to JSON Converter

Convert CSV data to JSON format online. Auto-detects delimiters, supports headers as keys, and outputs pretty or compact JSON. Copy with one click.

First row is headers

When to Convert CSV to JSON

Convert CSV to JSON when you need to send tabular data to an API, load it into a web application, create configuration files, or work with data in JavaScript or Python. JSON is the standard data format for web services, and most modern applications expect it.

Common scenarios include preparing data exports from Excel or Google Sheets for use in web apps, transforming database dumps into API-ready payloads, building configuration files from spreadsheet data, and converting legacy CSV data feeds into JSON for modern systems.

How CSV Headers Become JSON Keys

The first row of your CSV is treated as headers. Each header becomes a key in the resulting JSON objects, and each subsequent row becomes one object. A CSV with headers name, email, age produces objects like {"name": "Alice", "email": "alice@example.com", "age": "30"}.

The tool auto-detects common delimiters including commas, tabs, semicolons, and pipes. If your CSV uses an unusual delimiter, you can specify it manually. Header names are used exactly as they appear, so clean up spaces or special characters in your headers before converting if your target system requires specific key formats.

Common CSV Pitfalls and Solutions

Problem	Cause	Solution
Broken rows	Commas inside values without quoting	Wrap values containing commas in double quotes
Garbled characters	Wrong file encoding (e.g. Latin-1 vs UTF-8)	Save your CSV as UTF-8 before converting
Extra empty rows	Trailing newlines in the file	The tool trims these automatically
Numbers as strings	CSV has no type information	Use the type inference option to auto-detect numbers and booleans

Frequently Asked Questions

Does the tool auto-detect the delimiter?

Yes. The tool analyses the first few rows of your CSV to determine whether it uses commas, tabs, semicolons, or pipes as the delimiter. If auto-detection picks the wrong one, you can override it manually using the delimiter selector.

Are numbers converted to JSON number types or kept as strings?

By default, all values are kept as strings to avoid accidental data loss (for example, leading zeros in phone numbers or postcodes). If you enable type inference, the tool converts values that look like numbers to JSON numbers and recognises true/false as booleans.

Can I convert CSV with no header row?

Yes. Disable the 'first row is header' option and the tool will generate keys like column_1, column_2, column_3 automatically. You can rename them in the JSON output if needed.

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