Are NanoTools completely free to use?

Yes, all basic tools on NanoTools are completely free to use with no registration required. We offer premium features for power users.

Is my data secure when using NanoTools?

Your files are processed securely and are automatically deleted after processing. We do not store your files or data on our servers.

Do I need to install any software to use NanoTools?

No installation required. All tools work directly in your browser on any device - computer, tablet, or smartphone.

What file formats are supported?

We support a wide range of formats including PDF, JPG, PNG, WebP, GIF, JSON, XML, CSV, and many more depending on the tool.

JSON Schema Generator - Create JSON Schema

Generate JSON Schema online for free. Create schema from JSON data. Validation schema generator.

JSON Schema Generator

Generate JSON Schema from sample JSON data

Options

Strict mode (require all properties)

JSON Input

About JSON Schema

• JSON Schema defines the structure and validation rules for JSON data

• Generated schema follows JSON Schema Draft 7 specification

• Use strict mode to mark all properties as required

• Automatically detects common formats: email, URL, date, date-time, UUID

• Schemas can be used for validation, documentation, and code generation

• Nested objects and arrays are fully supported

• All schema generation happens client-side in your browser

What This Tool Does

Generate JSON Schema from sample data
Support for nested objects and arrays
Strict mode for required properties
Infer data types automatically
Draft 7 compliant schemas

How to Use

1
Paste JSON
Enter sample JSON data
2
Set options
Enable strict mode if needed
3
Generate
Create JSON Schema
4
Use schema
Copy for validation or docs

How it works

1

Paste JSON

Enter sample JSON data

2

Set options

Enable strict mode if needed

3

Generate

Create JSON Schema

4

Use schema

Copy for validation or docs

Use Cases

API contract validation
Form validation schemas
Documentation generation
Code generation from schemas
Data structure definition

Frequently Asked Questions

What is JSON Schema?

JSON Schema is a vocabulary that allows you to annotate and validate JSON documents. It defines structure, types, and constraints.

What does strict mode do?

Strict mode makes all properties required in the generated schema. Without it, properties are optional by default.

Can it handle complex nested structures?

Yes, the generator recursively processes nested objects and arrays to create complete schema definitions.

Is the schema Draft 7 compliant?

Yes, generated schemas follow JSON Schema Draft 7 specification for maximum compatibility.