What delimiters are supported?

Comma (,), semicolon (;), tab, and pipe (|) delimiters are supported. Select the correct one for your file before converting.

Can I upload a CSV file?

Yes. Click Upload CSV to select a .csv, .tsv, or .txt file from your device. The file is read locally and never uploaded to a server.

What happens if my CSV has a header row?

When 'First row is header' is checked, the first row is used as property names in the JSON objects. When unchecked, each row becomes an array of values.

Yes. All conversion happens in your browser. Your CSV data is never sent to any server.

What happens if my CSV has no headers?

Toggle off the First row is header option and the tool will use numeric keys (0, 1, 2...) for each column.

Is my data sent to a server?

No. All CSV to JSON conversion happens in your browser. Your spreadsheet data is parsed by JavaScript running in your tab — it never leaves your device.

CSV to JSON Converter — Convert CSV to JSON Free Online

Convert CSV files or text to JSON instantly. Supports headers, custom delimiters, and nested objects. Free CSV to JSON converter.

Delimiter:

First row is header Upload CSV

CSV Input

JSON Output

100% Private

No Upload

Instant

What is CSV to JSON?

A CSV to JSON converter transforms comma-separated values (CSV) data into JSON (JavaScript Object Notation) format. CSV is commonly used for spreadsheet data and database exports, while JSON is the standard format for web APIs and JavaScript applications. Our CSV to JSON converter automatically detects headers, supports custom delimiters, and produces clean, formatted JSON output.

How to Use CSV to JSON

1Paste your CSV data or upload a CSV file.
2The tool automatically detects the delimiter (comma, semicolon, tab).
3Toggle whether the first row contains headers.
4The JSON output is generated instantly.
5Copy or download the JSON result.

Key Features

Automatic delimiter detection (comma, semicolon, tab)
Header row support
Formatted JSON output
Copy and download options

Benefits

Convert spreadsheet data for use in web APIs
Transform database exports to JSON
Prepare data for JavaScript applications

Use Cases

CSV to JSON guide JSON Without Software

Why Use Irreva for CSV to JSON?

Convert spreadsheet data for use in web APIs

Transform database exports to JSON

Prepare data for JavaScript applications

Runs 100% in your browser — files never leave your device.

No account, no sign-up, no subscription — free forever.

Works on any device: desktop, tablet, or mobile.

Frequently Asked Questions

JSON formatter guide

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