JSON Schema

Validate your JSON data against schemas to ensure data integrity and catch errors early.

How to Validate

1. Open your JSON file in the editor
2. Click the JSON menu in the bottom bar
3. Select JSON Schema
4. Paste or write your JSON schema
5. Validation errors appear instantly in the UI

Schema Support

ToDiagram supports the full JSON Schema specification:

• Draft 7
• Draft 2019-09
• Draft 2020-12

Real-time Validation

As you edit your data:

• Valid data: Green checkmark in the bottom bar
• Invalid data: Red error indicator with details
• Error location: Click errors to jump to the problem node

Example Schema

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "minLength": 1
    },
    "email": {
      "type": "string",
      "format": "email"
    },
    "age": {
      "type": "integer",
      "minimum": 0
    }
  },
  "required": ["name", "email"]
}