JSON to CSV Converter
Convert JSON arrays and nested API responses into clean CSV, TSV, or Excel spreadsheets. Features automated object flattening, live table preview, and 100% private in-browser conversion.
{ } JSON Input Payload
0 records📊 Converted CSV Output
📑 Live Tabular Data Preview
Client-Side JSON to CSV Conversion Architecture
REST APIs, NoSQL databases, and logging frameworks output structured JSON objects that require transformation before import into spreadsheet engines or relational databases. This tool maps tree-structured JSON properties into tabular columns with RFC 4180 delimiter escaping, nested property flattening, and automatic UTF-8 Byte Order Mark (BOM) insertion.
Key Technical Features
🌳 Recursive Flattening
Traverses deeply nested JSON trees and maps nested keys into dot-delimited header paths (e.g. profile.billing.country) to retain hierarchical relationships in 2D sheets.
🛡️ RFC 4180 Escaping
Values containing internal commas, tabs, quotes, or newline breaks are automatically wrapped in double quotes, ensuring spreadsheet parsers never split cells incorrectly.
📊 Excel UTF-8 Compatibility
Prepends a UTF-8 BOM (\uFEFF) signature to generated CSV file downloads, ensuring Excel correctly renders international Unicode text and accented characters.
Frequently Asked Questions
How does this tool handle nested JSON objects and arrays?
Nested objects are automatically flattened using dot notation (e.g. {'user': {'address': {'city': 'Austin'}}} becomes the column header 'user.address.city'). Nested arrays are serialized into comma-separated values or JSON strings to preserve data integrity.
How does the converter handle commas and quotes inside JSON values?
Our engine follows standard RFC 4180 CSV specifications. Any string field containing delimiters (commas, semicolons), double quotes, or newline breaks is automatically wrapped in double quotes, and internal quotes are escaped as '""'.
Why do special Unicode characters display incorrectly in Microsoft Excel?
When downloading your CSV file, our tool automatically prepends a UTF-8 Byte Order Mark (BOM: \uFEFF). This signals to Microsoft Excel and other spreadsheet applications that the file contains UTF-8 encoded characters, preventing accented letters and symbols from rendering as corrupted text.
Is my JSON data uploaded to an external server for processing?
No. All parsing, object flattening, and CSV generation occur purely inside your browser memory using client-side JavaScript. Proprietary database dumps and customer payloads never leave your local machine.
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