CSV (Comma-Separated Values) is a simple file format used to store tabular data, such as a spreadsheet or database. Each line of the file is a data record, and each record consists of one or more fields, separated by commas.

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write and easy for machines to parse and generate. It's the standard format for web APIs.

Why convert CSV to JSON?

Web applications and APIs typically consume JSON data. Converting CSV (often from Excel) to JSON allows developers to easily import data into their applications or databases.

Does it support large files?

Yes! Since the conversion happens in your browser, it can handle files as large as your computer's memory allows, without the slowness of uploading to a server.

Completely. The conversion logic runs locally in your browser. Your sensitive data (customer lists, financial records) never leaves your device.

CSV to JSON Converter

Transform your CSV data into clean, structured JSON. Perfect for developers, data analysts, and API integration.

CSV to JSON Converter

Convert your CSV data to structured JSON format. Supports headers and custom delimiters.

CSV Input

JSON Output

First row is header

Delimiter:

What is CSV and Why Convert to JSON?

CSV (Comma-Separated Values) is a simple format for storing tabular data, but JSON provides a more structured and flexible way to represent data, especially for web applications and APIs.

Frequently Asked Questions

What delimiters are supported? You can specify any single character as a delimiter, such as comma, semicolon, or tab.
How are headers handled? If "First row is header" is checked, the first row becomes object keys in the JSON output.
Can I upload a CSV file? Currently, paste your CSV data directly. File upload may be added in future updates.

Bridging Spreadsheets and Code

Data often lives in two worlds: the world of business (Excel, Google Sheets, CSV) and the world of development (JSON, APIs, Databases). Our CSV to JSON Converter is the bridge between them.

Whether you're migrating a legacy database, importing product lists into an e-commerce site, or visualizing data with a JavaScript library, you need a reliable way to transform tabular data into structured objects.

Understanding the Formats

📄 CSV (Comma-Separated Values)

The universal format for spreadsheets. Simple, flat, and compact.

id,name,role
1,John Doe,Admin
2,Jane Smith,User

Example JSON Output

The universal format for the web. Structured, nested, and flexible.

[
{ "id": 1, "name": "John Doe", "role": "Admin" },
{ "id": 2, "name": "Jane Smith", "role": "User" }
]

Key Features for Developers

Custom Delimiters: Not all CSVs use commas. We support semicolons (;), tabs (\t), pipes (|), and more.
Header Detection: The tool automatically treats the first row as keys for your JSON objects.
Type Inference: (Advanced) It attempts to recognize numbers and booleans, so "123" becomes the number 123 and "true" becomes the boolean true, not strings.
Instant Feedback: See the JSON structure build in real-time as you type or paste data.

Common Use Cases

Database Seeding

Developers often receive initial data from clients in Excel. Convert it to JSON to easily seed your MongoDB, PostgreSQL, or Firebase database.

Data Visualization

Libraries like D3.js, Chart.js, or Recharts prefer JSON data. Quickly transform your CSV datasets to create beautiful charts and graphs.

Configuration Management

Manage complex app configurations in a spreadsheet for readability, then convert to JSON for your application to consume at runtime.

Privacy: Why Client-Side Matters

When dealing with data, privacy is paramount. Many online converters upload your file to a server to process it. This creates a risk: What if the server is compromised? What if they store your data?

Our tool is different. It runs 100% in your browser. The conversion code is downloaded once and executes on your machine. Whether you're converting a list of 10 items or a sensitive customer database of 10,000 records, the data never leaves your computer. You can even disconnect from the internet after loading the page, and it will still work.

Frequently Asked Questions

What is CSV? ▼

CSV stands for Comma-Separated Values. It's a plain text format used to store tabular data. It's widely supported by consumer, business, and scientific applications. Its simplicity makes it the lowest common denominator for moving data between different systems.

What is JSON? ▼

JSON (JavaScript Object Notation) is a lightweight format for storing and transporting data. It's self-describing and easy to understand. While it originated from JavaScript, it is now language-independent and is the standard format for modern web APIs and NoSQL databases.

My CSV uses semicolons, not commas. Can I still use this? ▼

Yes! While "Comma-Separated" is the name, the format often uses other characters like semicolons (common in Europe), tabs (TSV), or pipes (|). Our tool allows you to specify the delimiter, ensuring your data is parsed correctly regardless of the separator used.

How do I handle nested data? ▼

CSV is inherently flat (2D table), while JSON is hierarchical (nested objects). Converting flat CSV to nested JSON usually requires specific naming conventions (like "address.city") or post-processing. Our tool creates a flat array of objects, which is the standard direct translation. You can then restructure the JSON if needed using code.

Is there a file size limit? ▼

Technically, no hard limit is enforced by us. The limit is determined by your browser's available memory and processing power. Files up to several megabytes (tens of thousands of rows) are usually processed instantly. Very large files (hundreds of MBs) might cause the browser to freeze temporarily.