JSON Schema Generator — Infer Schema from JSON Online Free

What is JSON Schema Generator?

Infer JSON Schema from sample JSON. Generates type, properties, and required fields.

Analyze JSON sample data and generate a JSON Schema that describes its structure.

How to Use JSON Schema Generator

1. Paste or type your input into the editor on the left panel.
2. Results update automatically while you type. You can also press Ctrl+Enter to force a refresh.
3. View the result in the output panel on the right with full syntax highlighting.
4. Use Copy or Download to export the result.
5. Drag and drop .json or .txt files directly into the editor.
6. Toggle Tree View for an interactive, collapsible view of the JSON structure.

Example

{"name":"John","age":30}

{"type":"object","properties":{"name":{"type":"string"},"age":{"type":"number"}},"required":["name","age"]}

Common Use Cases

• Generate schemas for API validation
• Document data structures

Common Errors

Why Use Our JSON Schema Generator?

• 100% client-side — your data never leaves your browser. No server processing, no data collection.
• No sign-up required — start using the tool instantly with no registration or installation.
• Keyboard shortcuts — press Ctrl+Enter to run, ? for shortcuts list, Ctrl+B to toggle sidebar.
• Persistent state — your input is automatically saved across sessions using local storage.
• IDE-style interface — Monaco Editor (the engine behind VS Code) with syntax highlighting and error detection.
• Multi-format conversion — convert between JSON, XML, CSV, and YAML without switching tools.

Frequently Asked Questions

Related Tools

All Developer Tools

Guides by Search Intent