Converters · FREE ONLINE TOOL
CSV to JSON Converter
Convert CSV data to JSON format instantly. Supports custom delimiters, headers, and pretty printing. Free online conversion tool for developers.
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How to use CSV to JSON Converter
- Paste your CSV data or drag and drop a .csv file
- Verify the correct delimiter is detected (comma, semicolon, tab)
- Check that headers are detected correctly from the first row
- Toggle "Pretty Print" for readable output or off for minified
- Click "Convert" to generate the JSON
- Copy the result or download as a .json file
Examples & practical tips
- name,age,city → [{name: "John", age: 30, city: "NYC"}, ...]
- Tab-separated values from Excel → Clean JSON array
- European CSV with semicolons → Properly parsed JSON
- Headers with spaces → Preserved as object keys
About CSV to JSON Converter
Transform CSV data into JSON format instantly with our free CSV to JSON Converter. CSV (Comma-Separated Values) is great for spreadsheets, but JSON (JavaScript Object Notation) is the standard for web applications and APIs. Our converter bridges this gap seamlessly.
Conversion Features: - Automatic Header Detection: First row becomes object keys - Custom Delimiters: Support for comma, semicolon, tab, and pipe separators - Pretty Print: Formatted JSON with proper indentation - Minified Output: Compact JSON for production use - Array of Objects: Each row becomes a JSON object - Data Type Detection: Converts numbers and booleans automatically
Input Flexibility: - Paste Data: Copy from Excel, Google Sheets, or any spreadsheet - File Upload: Drag and drop .csv files - Custom Delimiters: Handle European CSVs with semicolons - Quoted Fields: Properly handles fields with commas inside quotes
Output Options: - Array of Objects: [{name: "John", age: 30}, {name: "Jane", age: 25}] - Pretty Printed: Readable, indented format for development - Minified: Compact format for production/storage - Download: Save as .json file
Why Convert CSV to JSON? - API Integration: Most REST APIs expect JSON format - Web Applications: JavaScript natively parses JSON - NoSQL Databases: MongoDB, Firebase use JSON documents - Configuration: JSON is preferred for config files
All processing happens in your browser—your data is never uploaded to any server, making it safe for sensitive spreadsheet data.
When this comes in handy
- Converting spreadsheet exports for API consumption
- Importing Excel data into web applications
- Creating JSON fixtures from CSV test data
- Migrating spreadsheet data to NoSQL databases
- Building configuration from spreadsheet specifications
- Converting analytics exports for dashboard processing
Frequently asked questions
Does the first row need to be headers?
Yes, by default the first row is used as JSON object keys. If your CSV doesn't have headers, you can enable "No Header" mode and keys will be generated as "column1", "column2", etc.
How are data types handled?
Our converter automatically detects and converts numbers (integers and floats), booleans (true/false), and null values. Everything else remains as strings. Quoted numbers stay as strings.
Can I handle large CSV files?
Yes, the tool handles large files well since processing is done in chunks. However, extremely large files (50MB+) may cause browser slowdowns. For very large files, consider using command-line tools.
What if my CSV has commas inside fields?
Fields containing commas should be wrapped in double quotes in the CSV. Our parser correctly handles this standard CSV format, extracting the full value without splitting on internal commas.
Can I convert JSON back to CSV?
This tool is specifically for CSV to JSON conversion. For JSON to CSV, the process requires flattening nested objects and handling arrays, which is a more complex operation with different options.
A little more know-how
How to Format JSON Online Quickly and Securely
Learn how to format JSON online quickly and securely using tools that protect your sensitive API data while instantly turning messy strings into readable code.
Read guideHow to Convert CSV to JSON Online for Free
Need to convert a CSV file to JSON? Here's how to do it instantly in your browser — no coding, no Excel, no signup required.
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