Convert Comma-Separated Values (CSV) to JavaScript Object Notation (JSON) instantly. Our free online tool transforms spreadsheet data into lightweight, API-ready JSON formats.

Bridging Spreadsheets and APIs

CSV is the standard for spreadsheets and data export, while JSON is the language of the web and APIs. Developers and data analysts often need to bridge this gap. Manually converting data is error-prone and time-consuming. Our CSV to JSON converter automates this process, ensuring your data structure is preserved perfectly.

Whether you're migrating a database, building a seeding script, or just need to visualize tabular data in a web application, this tool provides a robust, client-side solution.

Key Features

📄 Header Support

Automatically detects the first row as headers to create key-value pairs in the resulting JSON objects.

🔢 Type Inference

Intelligently converts numeric values to numbers and booleans to boolean types, rather than keeping everything as strings.

🧹 Minify & Prettify

Output your JSON as a compact, minified string for efficiency or a prettified, indented structure for readability.

⚡ Bulk Processing

Handle large datasets with ease. Since processing happens in your browser, there are no file size limits imposed by server timeouts.

How to Convert CSV to JSON

  1. Input Data: Paste your CSV data into the input field or upload a .csv file.
  2. Configure Options: Select whether your data uses commas, tabs, or semicolons as delimiters. Toggle "First row is header" if applicable.
  3. Convert: Click the "Convert" button. The tool maps rows to objects and columns to keys.
  4. Download: Copy the resulting JSON code or download it as a .json file.

Example Transformation

Input (CSV)

id,name,active
1,John Doe,true
2,Jane Smith,false

Output (JSON)

[
  {
    "id": 1,
    "name": "John Doe",
    "active": true
  },
  {
    "id": 2,
    "name": "Jane Smith",
    "active": false
  }
]

Frequently Asked Questions

Are nested JSON objects supported?

Standard CSV is flat, so the output is typically an array of flat objects. For nested structures, you would need a custom parser or dot-notation support (e.g., "user.name" in headers).

Is my data secure?

Absolutely. The conversion happens entirely within your web browser using JavaScript. No data is sent to our servers.

Can I convert Excel files?

You must first save your Excel file as a CSV (comma delimited) file, and then upload it here.