{ } JSON Viewer

Paste JSON data and instantly get a beautiful, interactive tree view

🌍 Used by 50,000+ users ⭐ 4.9/5 rating 🔒 100% Private 🚫 No Ads, No Signup

Features

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100% Free & Private

No ads, no signup, no watermark. Everything runs locally in your browser. Your data never leaves your device.

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Tree View

Collapsible tree structure clearly displays data hierarchy with quick navigation

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Error Detection

Automatically detect JSON syntax errors and indicate specific location for quick fixes

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One-Click Copy

Copy formatted JSON to clipboard with one click for quick use

📝 Input JSON
📄
Release to load JSON file
🌳 Tree View
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Enter JSON data on the left and click "Format"

FAQ

Q: What is JSON format?

JSON (JavaScript Object Notation) is a lightweight data interchange format. It's easy for humans to read and write, and easy for machines to parse and generate. JSON is commonly used for data transmission between frontend and backend in web applications and is one of the most common formats for modern APIs.

Q: Why does my JSON parsing fail?

Common reasons for JSON parsing failure include:

  • Missing quotes: All keys and string values need double quotes
  • Trailing commas: No comma after the last element
  • Using single quotes: JSON standard only supports double quotes
  • Missing or mismatched brackets
  • Containing comments: Standard JSON doesn't support comments (this tool auto-removes them)
Q: What is the maximum JSON data size supported?

JSON data size depends on browser memory limits, recommended not to exceed 10MB. Large JSON data may cause browser lag or crash. For very large data, use professional desktop JSON editors or command line tools (like jq).

Q: Can I edit JSON?

Yes. You can edit JSON data directly in the input box, then click the "Format" button to validate the syntax. The tool will automatically detect errors and indicate their location for quick troubleshooting.

Q: Will JSON data be uploaded to the server?

No. All JSON parsing and formatting operations are performed locally in your browser. Data is never uploaded to any server. You can safely process sensitive data with complete privacy protection.

Q: Is this tool really free with no ads?

Yes, 100% free with no ads, no registration, no watermark, and no usage limits. All processing happens locally in your browser — your data is never uploaded to any server.