JSON to CSV

Web MCP対応
JSON Input
0 文字
CSV Output
0 文字
Delimiter

How to Use

  1. 1Paste or type your JSON array into the input area
  2. 2Select delimiter and header options
  3. 3The conversion happens automatically as you type
  4. 4Copy result to clipboard or download as a CSV file

Features

Instant conversion with real-time preview
Multiple delimiter options
Optional header row
Handles nested JSON (flattened)
Copy to clipboard functionality
Download as CSV file
Client-side processing
100%ローカル処理 — データはブラウザから離れません
Files never uploadedProcessed in your browserCleared instantly when you leave

JSON to CSV Converter FAQ

Answers to the most common questions about using this converter.

How do I convert a JSON file to CSV?

Upload or paste your JSON file, choose a delimiter, and click convert. The tool flattens nested objects automatically and runs entirely in your browser — your file is never uploaded.

Is converting JSON to CSV safe and private?

Yes. All processing happens locally in your browser using JavaScript. Your data never leaves your device, making this tool safe for sensitive or proprietary data.

What is the maximum file size?

The tool can handle JSON arrays up to 100MB locally. Larger files may affect performance since processing happens on your device.

What delimiter options are available?

You can choose comma, tab, semicolon, or pipe as the delimiter. The tool also lets you toggle headers on or off, so you can match the exact format your spreadsheet or database expects.

Can I convert nested JSON objects to CSV?

Yes. Nested objects and arrays are automatically flattened into columns using dot notation, so complex JSON structures still produce a clean, readable CSV table.

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Your data stays yours

Unlike most online converters, ConvTop runs all processing locally in your browser.

100% Local Processing
Every conversion runs in your browser
Zero Uploads
Files never leave your device
Auto-Cleared
Data is gone the moment you leave
Completely Free
No sign-up, no limits, no watermark