Which JSON Schema draft is used?

Draft-07, a widely supported version compatible with most validators.

How are arrays with mixed item types handled?

The schemas of each item are merged, combining types into a union when they differ.

Are all object properties marked as required?

Yes for the top-level sample; nested objects follow the same rule based on the keys present in that sample.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

JSON Schema Generator

Infer a JSON Schema from a sample JSON document.

Support

Works Offline

Privacy First

No Login

No API

Sample JSON

Inferred JSON Schema

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

About the JSON Schema Generator

Paste a sample JSON object or array and instantly generate a draft-07 JSON Schema, including inferred types, required properties, and merged array item schemas.

Examples

Simple object

{"id":1,"name":"Ada"}

Output

{"type":"object","properties":{"id":{"type":"integer"},"name":{"type":"string"}}}

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser

JSON Schema Generator

About the JSON Schema Generator

Examples

Keyboard shortcuts

Related tools

JSON Compare

JSON Merger

JSON Path Finder

JSON Schema Validator

JSON Formatter

JSON Key Sorter

Frequently asked questions

Which JSON Schema draft is used?

How are arrays with mixed item types handled?

Are all object properties marked as required?

Is my data uploaded to a server?

Does it work offline and on mobile?

Read more