CSV to JSON Converter

Convert CSV text (Excel exports) into structured JSON arrays.

Input CSV
Output JSON

Statistics

Input CSV
Rows3
Characters37
Output JSON
Records0
Fields per Record0
Size0 B

💡 Quick Tip

The first row of your CSV is automatically used as keys for the JSON objects. Make sure it contains clear, unique names!

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What is CSV to JSON Converter?

The CSV to JSON Converter is a developer-friendly tool designed to transform spreadsheet data into code-ready format. While Excel and spreadsheets use CSV (Comma Separated Values) to store lists, web applications and APIs prefer JSON (JavaScript Object Notation).

This utility allows you to migrate data from old systems, import product catalogs provided in Excel, or simply format lists into objects that you can use in JavaScript, React, Python, or standard APIs.

How to Use

  1. Paste or Upload: Paste your CSV text into the input box or upload a .csv file.
  2. Check Headers: Ensure the first row contains your column headers (e.g., "id", "name", "price").
  3. Convert: Click the orange Convert button. The tool will parse each row into an object.
  4. Use Data: Click Download to get a .json file or Copy to use it in your code immediately.

Key Features

Smart Type Detection

Automatically detects numbers (10) and booleans (true) and converts them to the correct JSON type, rather than just strings.

Bulk Data Migration

Perfect for seeding databases. Turn a 1000-row spreadsheet into a seed file for MongoDB, Firebase, or SQL instantly.

Privacy First

Running locally in your browser means your sensitive business data is never transmitted over the internet/network.

Quote Handling

Intelligently handles complex CSVs where values contain commas by respecting standard double-quote wrapping.

Frequently Asked Questions

What is CSV to JSON conversion?

It involves transforming tabular data stored in Comma-Separated Values (CSV) format into a structured JSON (JavaScript Object Notation) array, making it usable in web applications.

Does it detect numbers automatically?

Yes! Our smart parser detects if a value is a number (e.g., '123' or '4.5') or a boolean ('true'/'false') and converts it to the correct type in the JSON output, instead of keeping everything as strings.

How are headers defined?

We assume the first row of your CSV contains header names (keys). All subsequent rows are converted into objects using these keys.

Can I upload Excel files?

You first need to save your Excel file as .csv (Comma Delimited). Then you can upload that file directly into this tool.

Is my data secure?

100% Secure. All parsing happens locally in your browser using JavaScript. No data is ever uploaded to our servers.

How does it handle quotes?

If a field contains a comma (e.g., 'New York, NY'), standard CSV requires it to be wrapped in quotes. Our tool correctly parses these quoted fields as a single value.

Can I convert large files?

Yes, for files up to 5-10MB, the browser handles it instantly. For extremely large datasets (100MB+), we recommend server-side tools, but for most web tasks, this is perfect.

How do I download the JSON?

After conversion, simply click the 'Download' button to save the result as a .json file to your computer.

Is this tool free?

Yes, FreeTools Pro is completely free to use for personal and commercial projects.

Can I use the output in React/Node.js?

Absolutely. The output is standard JSON, which can be directly imported into React state, Node.js applications, or databases like MongoDB.