CSV to JSON Converter
Convert CSV data to JSON format instantly. Free, no upload needed — everything runs in your browser.
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Browse All Tools →What Is CSV?
CSV (Comma-Separated Values) is one of the most common data exchange formats. Each line represents a record, and fields are separated by a delimiter (typically a comma). CSV files are used by spreadsheet applications like Excel and Google Sheets, databases, and many APIs. Despite its simplicity, CSV has edge cases — fields can contain commas, newlines, and quotes when properly escaped with double quotes.
Why Convert CSV to JSON?
JSON (JavaScript Object Notation) is the standard data format for web APIs and modern applications. Converting CSV to JSON makes data ready for use in JavaScript applications, REST APIs, NoSQL databases like MongoDB, and configuration files. JSON is also easier to nest, validate, and parse programmatically compared to CSV.
How This Converter Works
Paste your CSV data into the input field and click Convert. The parser properly handles quoted fields (including fields with commas, newlines, and escaped quotes inside them), multiple delimiter types (comma, tab, semicolon, pipe), and optional header rows. When "First row as headers" is checked, the output is an array of objects with header names as keys. Otherwise, it outputs an array of arrays. You can also convert JSON back to CSV using the reverse direction toggle.
Privacy & Security
This tool runs entirely in your browser. Your CSV and JSON data never leaves your device — no data is uploaded to any server. This makes it safe to use with sensitive or proprietary data. You can verify this by disconnecting from the internet and using the tool offline.
Frequently Asked Questions
Does this tool handle quoted fields with commas?
Yes. The CSV parser correctly handles fields wrapped in double quotes, including fields that contain commas, newlines, and escaped quotes (doubled quotes like "").
Can I use a tab or semicolon delimiter?
Yes. Use the Delimiter dropdown to select comma, tab, semicolon, or pipe. This is especially useful for TSV (Tab-Separated Values) files exported from Excel or European CSV files that use semicolons.
Can I convert JSON back to CSV?
Yes. Click the "JSON → CSV" toggle to switch direction. Paste a JSON array of objects or a JSON array of arrays, and the tool will generate properly formatted CSV output with escaped fields.
Is my data uploaded to a server?
No. All conversion happens locally in your browser using JavaScript. No data is transmitted anywhere. This tool is safe for sensitive and proprietary data.
What JSON format is produced?
When "First row as headers" is enabled, the output is an array of objects where each object's keys are the header values. When disabled, the output is an array of arrays (each row is an array of strings). Output is pretty-printed with 2-space indentation.