JSON → CSV Converter
Convert JSON to CSV Online
Flatten JSON data into CSV format for spreadsheets and databases. Convert Buddy processes JSON files of any size using a streaming engine that runs entirely in your browser. Perfect for data exports, analytics, and database imports.
✓
Flattens nested JSON structures
✓
Auto-generates CSV headers
✓
Handles arrays and objects
✓
No file size limits
Start Converting JSON to CSV
No registration required. Files processed locally in your browser.
Command Center
Detect → schema → convert
Drop a file and watch Convert Buddy detect structure, preview fields, and convert instantly.
Drop a file to detect + convert
Supported formats: CSV, JSON, NDJSON, XML
Detection status
IdleFormat: json
Structure: Awaiting detection.
Fields: 0
Estimated records: —
Input: Awaiting file
Output format
Choose your destination format.
Performance telemetry
LiveThroughput
0.0 MB/s
Records/sec
0
Records processed
0
Elapsed
00:00
Bytes in/out
0.0 MB / 0.0 MB
Output
Output will appear here after conversion completes.
Format: json → csv
Output files are UTF-8 text. JSON output is intentionally minified for streaming performance, so it may open as a single line until you run your editor's format command.
Frequently Asked Questions
How does JSON to CSV conversion work?
Convert Buddy parses your JSON file and extracts records (objects or array elements). Each record is flattened into a CSV row with consistent columns. Nested objects can be flattened with dot notation (e.g., "user.name"), or you can customize the transformation.
Can I convert nested JSON to CSV?
Yes. Convert Buddy can flatten nested JSON objects and arrays. Nested properties are converted using configurable strategies: dot notation (user.email), underscore notation (user_email), or you can define custom column mappings in the transform editor.
What if my JSON file is very large?
Convert Buddy uses streaming processing to handle JSON files of any size. The file is parsed incrementally, and CSV rows are written progressively without loading the entire file into memory. You will see real-time throughput metrics during conversion.
Are CSV headers automatically generated?
Yes. Convert Buddy analyzes the JSON structure and automatically generates CSV column headers based on the detected fields. You can also preview the schema and customize field names before converting.
Is CSV the best format for my JSON data?
CSV is ideal for tabular data, spreadsheets (Excel, Google Sheets), and database imports. If your JSON contains complex nested structures or you need to preserve exact data types, consider using NDJSON instead for streaming line-delimited JSON.
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