JSON Schema Generator

12 tools

Infer a JSON Schema from a sample.

Runs in your browser — your files and text stay on your device

Everything you'd need a dedicated JSON app for — formatting, a collapsible tree view, structural diffing, converting to/from CSV, YAML, and XML, generating TypeScript interfaces and JSON Schemas, querying with JSONPath, and validating JSON Lines — runs entirely client-side using your browser's native JSON engine, so nothing you paste is ever sent to a server.

Format & Validate Tree View JSON Diff JSON → CSV JSON ↔ YAML JSON ↔ XML → TypeScript Schema Generator Schema Validator JSONPath Tester Sort Keys JSON Lines

Sample JSON

JSON Schema

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "id": {
      "type": "integer"
    },
    "name": {
      "type": "string"
    },
    "active": {
      "type": "boolean"
    },
    "roles": {
      "type": "array",
      "items": {
        "type": "string"
      }
    }
  },
  "required": [
    "id",
    "name",
    "active",
    "roles"
  ]
}

How to use this tool

1Paste a sample JSON payload.
2A draft-07 JSON Schema is inferred automatically.
3Copy it, or test it against other payloads in the Schema Validator tab.

Frequently asked questions

Does it mark every field as required?

Yes — since it only sees one sample, every key present is assumed required. Edit the generated schema's "required" array by hand to make fields optional.

Is my JSON uploaded anywhere?

No, the schema is generated entirely in your browser.

Guides

All guides →