API Response Simulator

Generate mock JSON API responses from schema templates and presets

People Also Use These Tools

URL Encoder

Encode and decode URLs

Base64 Encoder

Encode and decode Base64

JSON Formatter

Format and validate JSON

About This Tool

The API Response Simulator generates mock JSON API responses from preset templates (User, Product, Order) or custom schemas. Perfect for frontend development and testing when you need realistic data without a live backend.

How to Use

  1. Select a Preset Template (User, Product, or Order) or choose "Custom Schema" to define your own fields.
  2. If using custom schema, define your JSON structure with field names and data types.
  3. Adjust the Number of Records to generate (1–100).
  4. Click Generate Mock JSON and copy the result using the Copy JSON button.

Why Choose OmniTools?

⚡ Instant Results

Zero server lag. All calculations run locally on your device for maximum speed.

🛡️ 100% Private

Your data never leaves your device. No uploads, no servers, no tracking.

Frequently Asked Questions

What preset templates are available?

User (name, email, age, role), Product (name, price, category, stock), and Order (id, customer, total, status) presets are included.

Can I define my own schema?

Yes. Select "Custom Schema" and define your fields as a JSON array with name and type properties. Supported types include string, number, boolean, and date.

How many records can I generate?

You can generate between 1 and 100 records per request. All generation happens locally in your browser.

Is this tool free?

Yes, completely free with no sign-up required. All processing runs in your browser.

Related Tools