JSON Schema Generator

Generate Draft 7 or 2020-12 JSON Schema from sample JSON. Toggle required fields, $schema, title, and additionalProperties — client-side only.

Introduction

JSON Schema Generator is a free, browser-based utility in our JSON Tools collection. Infer a draft JSON Schema from sample JSON. Choose Draft 7 or 2020-12, toggle $schema and required fields, set a title, and control additionalProperties — then copy or download the result. JSON Schema Generator walks a representative payload and proposes object/array/primitive types, including integer vs number. Use it to bootstrap validation for APIs, config files, or MCP inputSchema drafts, then tighten enums, formats, and optionality before CI. Pair with the JSON Schema Validator and JSON to TypeScript when you need both contracts and client types. Everything runs locally in your browser — inputs stay on your device, with no account or upload required. Highlights include draft 7 and 2020-12 $schema uris.

Features

Draft 7 and 2020-12 $schema URIs
Required fields and additionalProperties controls
Nested objects and arrays of objects
Integer vs number inference
Copy and download schema JSON

How to use

1
Paste a representative JSON sample (or load the example).
2
Pick a draft, title, and required/additionalProperties options.
3
Copy or download the schema, then review before production use.

Example

Simple object

Input

{"name":"Ali","age":32}

Output

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "name": { "type": "string" },
    "age": { "type": "integer" }
  },
  "required": ["name", "age"]
}

Benefits

Run JSON Schema entirely in the browser with no signup or installation.
Keep sensitive sample data private — processing never leaves your device.
Draft 7 and 2020-12 $schema URIs
Required fields and additionalProperties controls
Nested objects and arrays of objects
Pair it with JSON to TS and JSON Schema when your workflow needs adjacent utilities.

FAQs

Treat it as a draft. Review optionality, enums, formats, and array item unions before shipping.

Both are supported via the $schema URI. Prefer the draft your validators and tooling already use.

Generate from a few shapes and merge the stricter rules by hand, or disable required fields until you know which keys are always present.

Entirely in your browser from the sample you paste.

Yes. JSON Schema on EverydayDevTools is free, with no account, watermarks, or usage caps for normal interactive use.

No. JSON Schema runs in your browser. Your input is processed locally and is not sent to EverydayDevTools servers.

Infer a draft JSON Schema from sample JSON. Choose Draft 7 or 2020-12, toggle $schema and required fields, set a title, and control additionalProperties — then copy or download the result. It fits everyday json tools tasks when you want a fast local utility instead of installing a CLI or opening a heavy IDE feature.

Core capabilities include: Draft 7 and 2020-12 $schema URIs; Required fields and additionalProperties controls; Nested objects and arrays of objects; Integer vs number inference.