CSV Input
JSON Output
Converted JSON will appear here...
CSV to JSON Converter
Turn spreadsheet rows into clean JSON arrays — automatic type detection, quoted-field handling, and Excel-compatible parsing.
About CSV to JSON Conversion
CSV is the universal export format for spreadsheets, databases, and analytics tools. JSON is the universal API and JavaScript format. Converting CSV to JSON bridges data analysis and application development.
How our parser handles quoted fields
Real-world CSV is messy: fields can contain commas, quotes, and newlines. Our parser correctly handles RFC 4180 quoted strings, escaped double-quotes, and trims whitespace from unquoted values.
Automatic type coercion
CSV files have no types — everything is a string. Our converter intelligently detects numbers, booleans (true/false), and empty cells (null). This produces idiomatic JSON ready to use without further parsing.
Headers become object keys
The first row of your CSV is treated as the header row. Each subsequent row becomes a JSON object with the header values as keys. The result is a clean array of objects.
Common use cases
- Excel exports to REST API payloads
- Database CSV dumps to MongoDB/Firestore documents
- Google Sheets data to frontend application state
- Analytics exports to BI dashboard data
- CRM contact lists to marketing automation tools
- Inventory CSVs to e-commerce product catalogs
Whether you are migrating data, prototyping an API, or feeding an Excel export into your JavaScript app, this converter delivers clean, well-typed JSON in one click.
Instant Conversion
Paste your CSV and see JSON appear in real-time. No manual mapping required.
100% Private
Your spreadsheet data stays in your browser. Safe for customer lists and internal data.
Smart Type Detection
Numbers, booleans, and nulls auto-detected. No more string-typed numbers.
Perfect For
Built for data engineers, analysts, and developers
Data Analytics
Convert analytics exports into JSON for dashboards and visualization tools.
Database Import
Transform CSV exports into JSON ready for MongoDB, Firestore, or DynamoDB.
API Mock Data
Turn spreadsheets into realistic JSON fixtures for API development and testing.
All Features
Everything you need for CSV conversion
Auto Headers
First row becomes object keys
Real-time Convert
See JSON update as you paste
Type Detection
Numbers, booleans, nulls inferred
Quoted Fields
RFC 4180 compliant parsing
Array Output
Clean JSON array of objects
Pretty Output
Indented, readable JSON
Error Detection
Clear messages for malformed CSV
Smart Empty Handling
Empty cells become null
Excel Compatible
Works with Excel and Google Sheets exports
Copy & Download
One-click copy or .json export
History Tracking
Recent conversions saved locally
Live Validation
Instant feedback on CSV structure
Why Developers Love It
Built with your data workflow in mind
Blazing Fast
Native parser handles 100k+ rows quickly
Works Offline
No data leaves your device
Mobile Friendly
Convert spreadsheets from your phone
Dark & Light Themes
Easy on the eyes day or night
Smart Defaults
Sensible type coercion out of the box
Zero Setup
No installs, no rate limits, free forever
Related Tools
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CSV to JSON FAQ
Common questions about CSV conversion