Developer Tool

JSON Generator

Generate sample JSON data for testing and development from predefined templates or custom schemas.

Using the JSON Generator

Testing your API requires realistic data. Our JSON generator allows you to create large datasets of mock objects using smart placeholders for names, email addresses, dates, and random numbers, ensuring your application handles edge cases and scale correctly.

How it Works

Define your JSON template using the provided editor.

Use tags like {{name}}, {{email}}, or {{integer(1,100)}} for random values.

Specify the number of records you want to generate.

Click "Generate" and download the resulting mock data file.

Count

Include nulls

Generation Options

Quantity

items (max 1000)

Output Format

Pretty print JSON

Seed (for reproducible data) Leave empty for random

Template Syntax

{{uuid}} - Random UUID
{{firstName}} - First name
{{lastName}} - Last name
{{email}} - Email address
{{int:min,max}} - Random integer
{{float:min,max}} - Random float
{{date}} - Random date
{{bool}} - true/false
{{pick:a,b,c}} - Pick one
{{lorem:words}} - Lorem ipsum
{{image:w,h}} - Placeholder image URL

Generation Options

Quantity

items

Pretty print JSON

Select a template and click Generate</pre>
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        <p class="sd-st-note" style="margin-top: 20px;">
            Your privacy is our priority. All generation happens locally in your browser.