CSV to JSON

Convert comma-separated values (CSV) into JSON format.

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Input CSV
0 Rows
Output JSON
0 KB

Free CSV to JSON Converter 2026

Welcome to Code Formatter CSV to JSON Converter ? the most robust and secure way to transform your flat CSV data into structured JSON objects. Whether you are migrating a legacy database, processing a large Excel export, or preparing data for a REST API, our tool simplifies the conversion process with enterprise-grade parsing logic.

CSV (Comma Separated Values) is the universal format for spreadsheets, but modern web applications and APIs speak JSON (JavaScript Object Notation). Manually converting rows to objects is tedious and prone to syntax errors. Our online CSV parser handles this automatically, supporting custom delimiters, quoted fields, and large datasets effortlessly.

How to Convert CSV to JSON

Transform your data in seconds:

Method 1: Paste Text

  1. Copy your CSV data (including headers).
  2. Paste it into the "Input CSV" pane.
  3. Click "CONVERT". The JSON array appears instantly.

Method 2: Upload File

  1. Drag and drop your `.csv` file into the upload area.
  2. The tool reads the file locally and converts it immediately.

Key Features

We use the industry-standard PapaParse engine for maximum reliability:

  • Smart Auto-Detection: Automatically detects your delimiter (comma, tab, pipe) and newline characters.
  • Type Parsing: Intelligently converts "true"/"false" strings to Booleans and numeric strings to Numbers in the JSON output.
  • Header Support: Uses the first row of your CSV as the keys for the generated JSON objects.
  • Robust Parsing: Correctly handles complex edge cases like line breaks within cells and escaped quotes.
  • Privacy First: Your sensitive data stays in your browser. We never upload your files to any server.

Why Convert CSV to JSON?

1. API Integration

Most modern REST APIs and NoSQL databases (like MongoDB) require data in JSON format. This tool bridges the gap between your spreadsheet data and your backend.

2. Data Visualization

JavaScript charting libraries (Chart.js, D3.js) utilize JSON arrays to render graphs. Converting your CSV report allows you to visualize it on the web.

3. Configuration Files

Many systems use JSON for config files. You can manage complex configurations in Excel/CSV for readability and convert them to JSON for deployment.

Understanding the Output

By default, our tool generates an Array of Objects:

[
  {
    "id": 1,
    "name": "John Doe",
    "active": true
  },
  ...
]

Each row becomes an object, and the header cells become the keys. This is the standard format expected by most applications.

Frequently Asked Questions

Is there a file size limit?

Since parsing happens in your browser, the limit depends on your device's RAM. Files up to 50MB are usually processed smoothly.

Does it parse numbers correctly?

Yes. The tool attempts to convert strings like "123.45" into actual numbers in JSON, rather than keeping them as strings.

Can I use a custom delimiter?

Our parser auto-detects standard delimiters (comma, semicolon, tab). If your format is unique, ensure it's consistent throughout the file.

What if my CSV has no headers?

Currently, the tool assumes the first row is a header row to generate meaningful keys. If you omit headers, the keys might be auto-generated or the first data row will be consumed as keys.

Is it secure?

Absolutely. No data is sent over the internet. You can even disconnect your internet after loading the page and it will still work.

Can I convert JSON back to CSV?

Yes! Check out our JSON to CSV Converter tool for the reverse operation.

Code Formatter ? 2026. Professional developer tools built with privacy and performance in mind.

?? Read Our Complete CSV to JSON Guide ?

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