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JSON to CSV/Excel Converter
Professional Multi-Format Converter with Intelligent Flattening & Deep Nesting Support
Transform complex JSON data into multiple formats with our comprehensive JSON to CSV/Excel Converter. Intelligent flattening for deeply nested structures, bidirectional conversion, type preservation, multi-sheet Excel export, and support for 7+ output formats. Perfect for data analysis, API integration, reporting, and database migration.
📊 Multi-Format Export
Convert to CSV, Excel, XML, YAML, SQL, HTML, and Markdown formats
🔄 Bidirectional Conversion
Convert JSON to CSV/Excel and back with intelligent type inference
📈 Deep Nesting Support
Handle unlimited nesting levels with smart flattening algorithms
🎯 Type Preservation
Optional type-header CSV to maintain data types during conversion
🧩 Smart Flattening
Three flattening modes: denormalized, indexed, and parent-reference
📑 Excel Multi-Sheet
Automatic multi-sheet generation for deeply nested structures
⚡ Web Worker Optimization
Background processing for large files (>5 MB) without UI blocking
💾 Save Presets
Save and reuse conversion settings with LocalStorage persistence
Why Choose Our JSON to CSV/Excel Converter?
Our converter goes beyond simple JSON-to-CSV transformation. It intelligently analyzes nested structures, offers multiple flattening strategies, preserves data types, and supports professional Excel exports with multi-sheet capabilities. Whether you're working with simple API responses or complex 20-level nested data structures, our tool handles it all with ease.
Complex Nesting Example
{"person": {"name": "Max", "address": {"street": "Main St"}}}Output CSV Headers:
person.name, person.address.street
Automatically flattens nested objects with clear column naming.
Array Handling
Indexed Mode: Arrays → [0], [1], [2] columns
Parent-Reference: Arrays → separate rows with ID
Choose the flattening strategy that fits your use case.
Type Preservation
Type-CSV: Additional header row with types
"string", "number", "boolean", "null"
Maintain data types for accurate reverse conversion.
Input Data
Drop JSON, CSV, or Excel file here or click to browse
Supported: .json, .csv, .xlsx (max 10 MB)Conversion Settings
Data Preview
No data to preview
Upload a file or paste JSON/CSV to get startedStructure Analysis
Nesting Depth Visualization
No structure to analyze
JSON Structure Preview
No structure to preview
Validation Errors
No errors detected