Random JSON Generator

About Random JSON Generator

The Random JSON Generator is a powerful developer tool for creating realistic dummy JSON data. Whether you need mock data for API testing, UI prototyping, database seeding, or documentation examples, this tool generates properly structured JSON objects populated with realistic values like names, emails, addresses, prices, and timestamps.

Key Features

• 5 Preset Schemas: Quickly generate common data structures - User Profiles, E-commerce Products, Blog Articles, Order Data, and Event/Log Entries
• Custom Templates: Define your own JSON structure with 40+ placeholder types for complete flexibility
• Bulk Generation: Generate 1-100 objects at once, perfect for populating test databases
• Flexible Formatting: Choose 2-space, 4-space indentation, or minified output for different use cases
• One-Click Export: Copy to clipboard or download as .json file instantly
• Realistic Data: Generated data includes proper names, valid email formats, real cities, and sensible values
• Privacy-Focused: No server-side storage - data is generated and immediately returned

Preset Schema Types

User Profile Schema

Generates complete user objects with personal information, contact details, nested address objects, job information, and timestamps. Perfect for testing user management systems, CRM applications, or authentication flows.

E-commerce Product Schema

Creates product objects with names, descriptions, pricing, stock levels, ratings, image arrays, and category tags. Ideal for testing e-commerce platforms, product catalogs, or inventory systems.

Blog Article Schema

Produces article objects with titles, slugs, content paragraphs, author information, categories, tags, and publication metadata. Great for testing CMS systems, blog platforms, or content APIs.

Order Data Schema

Generates order objects with customer info, line items with calculated totals, shipping addresses, payment methods, and order statuses. Essential for testing checkout flows, order management, or payment integrations.

Event/Log Entry Schema

Creates log entries with timestamps, severity levels, event types, session data, IP addresses, and nested metadata. Useful for testing logging systems, analytics dashboards, or monitoring tools.

Custom Template Placeholders

When using the Custom Template option, wrap placeholders in double curly braces. Here are all available placeholders:

Custom Template Example

Create a custom employee record:

{
  "employeeId": "{{uuid}}",
  "name": "{{fullName}}",
  "email": "{{email}}",
  "department": "{{category}}",
  "salary": {{int:50000-150000}},
  "startDate": "{{date}}",
  "isRemote": {{bool}}
}

Use Cases

API Development and Testing

Generate mock responses for REST APIs without setting up a database. Test how your frontend handles various data shapes and edge cases. Create consistent test fixtures for automated testing.

UI/UX Prototyping

Populate design mockups with realistic data instead of placeholder text. Show stakeholders how interfaces will look with actual content. Test responsive layouts with varying content lengths.

Database Seeding

Quickly populate development or staging databases with test data. Create realistic datasets for performance testing. Generate sample data for demos and presentations.

Documentation Examples

Create realistic API response examples for documentation. Generate sample payloads for integration guides. Illustrate data structures with concrete examples.

Education and Learning

Provide realistic datasets for programming tutorials. Create exercises with varied test data. Demonstrate JSON structure concepts with tangible examples.

Frequently Asked Questions

What placeholders can I use in custom JSON templates?

The Random JSON Generator supports 40+ placeholder types including: {{uuid}} for unique IDs, {{firstName}}, {{lastName}}, {{email}}, {{phone}} for personal data, {{city}}, {{country}}, {{address}} for locations, {{price}}, {{productName}}, {{category}} for e-commerce, {{date}}, {{datetime}}, {{timestamp}} for dates, {{int:min-max}} and {{float:min-max}} for custom number ranges, {{bool}} for booleans, and many more.

How do I generate a specific range of random numbers?

Use the range syntax with int or float placeholders. For integers, use {{int:1-100}} to generate a random integer between 1 and 100. For decimals, use {{float:0.5-9.99}} to generate a random float in that range. The result will be randomly distributed within the specified range.

Can I generate nested JSON objects?

Yes! The preset schemas (User, Product, Article, Order, Event) all include nested objects and arrays. For custom templates, you can create nested structures by writing valid JSON with placeholders at any level of nesting.

Is the generated JSON data stored on your servers?

No, we never store generated JSON data on our servers. The data is generated on-demand when you click Generate and is immediately returned to your browser without any server-side storage. Your custom templates are also processed and discarded immediately.

Tips for Best Results

• Start with a preset schema similar to your needs, then customize from there
• Use the minified option when generating large datasets to reduce file size
• Test your custom template with 1 object first to verify the structure before bulk generation
• Use specific number ranges like {{int:18-65}} for age to get realistic values
• Combine multiple placeholders in a single string: "{{firstName}} {{lastName}}"

Related Resources

Learn more about JSON and data generation:

• JSON Official Specification
• Working with JSON - MDN Web Docs