CSV to JSON Converter - Convert CSV to JSON Online

CSV Input

JSON Output

What is CSV to JSON Converter?

Need to convert your CSV (Comma-Separated Values) data to JSON (JavaScript Object Notation)? This tool does that instantly. CSV is great for spreadsheets and databases, while JSON is the standard format for web APIs and modern applications. Convert between them whenever you need.

According to MDN Web Docs, JSON is the most common data format for APIs. Converting CSV to JSON lets you use spreadsheet data in web applications, APIs, or configuration files. The converter handles headers, nested data, and special characters perfectly.

Everything happens in your browser – your data stays private. Convert, download, and use your JSON file right away.

Key Features

Automatic Header Detection

The converter automatically uses the first row as JSON keys. Each CSV row becomes a JSON object with those keys, making it perfect for structured data conversion.

Array of Objects Format

Converts CSV rows into a JSON array of objects. Each row becomes an object, with column headers as keys. This is the standard format for API responses and web applications.

Handles Special Characters

Properly escapes quotes, commas, and newlines in CSV values. Converts them to valid JSON strings, so your data structure is preserved perfectly.

File Upload Support

Upload CSV files directly (.csv or .txt). No need to copy-paste large datasets. Works with files of any size, from small logs to massive spreadsheets.

Pretty Print JSON

Output JSON is formatted with proper indentation and line breaks. Easy to read, validate, and use in your applications or APIs.

Copy & Download

One click to copy JSON to clipboard, or download it as a .json file. Ready to use in your code, APIs, or configuration files.

How It Works

Paste or Upload CSV

Paste your CSV data into the left editor, or click "Upload" to load a .csv or .txt file. Click "Sample" to see example CSV data. The tool handles standard CSV format with comma, semicolon, or tab delimiters.

Automatic Conversion

The converter processes your CSV instantly. The first row becomes JSON keys, and each subsequent row becomes a JSON object. The formatted JSON array appears on the right side.

Copy or Download

Click "Copy" to copy the JSON to your clipboard, or "Download" to save it as a .json file. Use it in your web applications, APIs, or any system that accepts JSON format.

Use Cases

API Development

Convert spreadsheet data to JSON for API responses. Perfect when you need to expose CSV data through REST APIs or GraphQL endpoints. Works great with frameworks like Express.js or FastAPI.

Data Migration

Migrate data from spreadsheets to databases or NoSQL systems. Convert CSV exports to JSON format for MongoDB, Firebase, or other JSON-based databases.

Configuration Files

Convert CSV data to JSON configuration files. Many modern tools use JSON for config – convert your spreadsheet settings to JSON format instantly.

Frontend Development

Use CSV data in web applications. Convert spreadsheet exports to JSON for use in React, Vue, or Angular applications. Perfect for data visualization or dashboards.

Common Questions

How are CSV headers handled?

The first row of your CSV becomes the JSON keys. Each subsequent row becomes a JSON object with those keys. For example, if your CSV has headers "name, age, city", each row becomes {"name": "...", "age": "...", "city": "..."}.

What if my CSV has commas in values?

The converter handles quoted CSV values correctly. If your CSV uses quotes around values containing commas (standard CSV format), those are preserved and converted to valid JSON strings.

Can I convert CSV without headers?

If your CSV doesn't have headers, the converter will use column indices (0, 1, 2, etc.) as keys. For better results, add a header row to your CSV before converting.

What JSON format is produced?

The output is a JSON array of objects. Each CSV row becomes one object in the array. This is the standard format for APIs and web applications, compatible with JSON specifications.

Is my data safe?

Absolutely. All conversion happens in your browser using JavaScript. Your CSV data never leaves your computer – no server uploads, no storage, completely private.

Can I convert JSON back to CSV?

Yes! Use our JSON to CSV Converter for reverse conversion. Perfect for exporting JSON data back to spreadsheet format.

Related Tools

CSV conversion is just one part of data workflow. Here are other tools:

Want to learn more? Read about RFC 4180 CSV standard or explore JSON format specifications.