CSV to JSON Converter
Convert CSV to JSON online for free. Transform comma-separated values into structured JSON data instantly. Supports custom delimiters, file upload, drag & drop, and real-time preview. 100% browser-based.
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Convert CSV Data to JSON Instantly
CSV (Comma-Separated Values) and JSON (JavaScript Object Notation) are two of the most common data interchange formats. CSV is widely used for spreadsheet exports, database dumps, and data analysis, while JSON is the standard for web APIs, configuration files, and modern applications. Our converter bridges these two worlds, letting you transform CSV data into clean, structured JSON in real-time.
Simply paste your CSV data or upload a file, and watch as the tool instantly converts it to JSON. Configure delimiters, choose whether to use headers as property names, control indentation, and even parse numeric values automatically. All processing happens locally in your browser for maximum speed and privacy.
How to Convert CSV to JSON
Input Your CSV Data
Paste CSV data directly into the input area, or upload a CSV file using the upload button. You can also drag and drop files. The tool accepts .csv, .tsv, and .txt files.
Configure Options
Select your delimiter (auto-detected by default), toggle whether the first row contains headers, choose indentation style, and enable number parsing if needed.
Get Your JSON
The JSON output updates in real-time as you make changes. Copy it to your clipboard with one click or download it as a .json file. Preview the parsed data in the table below.
Powerful Conversion Features
Real-Time Conversion
See your JSON output update instantly as you type or modify CSV data. No button clicks needed.
File Upload & Drag Drop
Upload CSV files directly or drag and drop them onto the input area. Supports .csv, .tsv, and .txt formats.
Smart Delimiter Detection
Automatically detects whether your data uses commas, semicolons, tabs, or pipes as delimiters.
Data Preview Table
See a visual table preview of your parsed CSV data to verify the conversion looks correct.
Number Parsing
Optionally parse numeric strings into actual numbers in the JSON output for proper data typing.
100% Private
All processing happens in your browser. No data is uploaded to any server, ensuring complete privacy.
CSV vs JSON: Format Comparison
| Feature | CSV | JSON |
|---|---|---|
| Structure | Flat, tabular rows/columns | Hierarchical, nested objects |
| Data Types | All text (no types) | String, Number, Boolean, Null, Array, Object |
| File Size | Smaller (less overhead) | Larger (keys + syntax) |
| Readability | Spreadsheet-friendly | Developer-friendly |
| Best For | Spreadsheets, databases, bulk data | APIs, configs, web applications |
| Nesting | Not supported | Unlimited nesting |
Common Use Cases
Web Development
- Convert spreadsheet data for web APIs
- Generate mock data for frontend development
- Transform exported data for JavaScript apps
- Create configuration files from CSV
Data Migration
- Convert database exports for NoSQL import
- Transform legacy CSV data to modern formats
- Prepare data for MongoDB or CouchDB
- Bridge between spreadsheet and API systems
Data Analysis
- Prepare CSV datasets for visualization tools
- Convert analytics exports to JSON
- Transform survey data for processing
- Clean and structure raw CSV data
API & Integration
- Format CSV data for REST API requests
- Create JSON payloads from spreadsheets
- Convert product catalogs for e-commerce APIs
- Transform contact lists for CRM imports
Use Consistent Headers
Ensure your first row has unique, descriptive column names. These become JSON property names. Avoid spaces and special characters in headers for cleaner output.
Handle Quoted Fields
If your data contains commas, wrap those fields in double quotes. The parser follows RFC 4180 standards and correctly handles quoted fields with embedded delimiters.
Enable Number Parsing
Toggle "Parse Numbers" to automatically convert numeric strings (like "42" or "3.14") to actual JSON numbers instead of strings. This saves manual type conversion later.
Check the Preview Table
Always verify the data preview table below the converter. It shows how your CSV was parsed, making it easy to spot delimiter issues or misaligned columns.
Use Minified for APIs
When preparing JSON for API requests, choose "Minified" indentation to reduce the output size. Use pretty print for debugging and readability.
Try Auto-Detect
The auto-detect delimiter option analyzes your data to determine the correct separator. It works well for most CSV files but you can override it if needed.