JSON Array Generator – Generate JSON Arrays Online
Generate JSON arrays with configurable length, types, and value ranges instantly. Our free JSON Array Generator is ideal for creating test data, mock datasets, and demos.
About JSON Array Generator
Writing test data by hand is tedious and error-prone. This tool generates JSON arrays instantly with configurable length and value types, giving you realistic mock data for testing APIs, components, and demos without the manual work.
How it works
Set the array length using the Array Length input (up to 1000 items) and choose a value type from the dropdown: Number, String, Boolean, or Object. Click Generate and the tool creates an array with random values of your chosen type.
Numbers are random integers up to 1000, strings follow the pattern item_0, item_1, booleans are random true or false, and objects include an id and random value. Copy or download the result directly from the page.
When you'd use this
You need sample data to test how your UI handles lists of different sizes. Generate arrays with 10, 100, or 1000 items to verify pagination, virtualization, and performance under load.
This generates simple random data, not realistic domain-specific values. For complex test scenarios with specific patterns or relationships, you'll need a more advanced mock data generator.
Questions
What value types can I generate?
Choose from Number (random integers), String (item_0 pattern), Boolean (random true/false), or Object (with id and value properties).
How large can the array be?
The maximum length is 1000 items. Larger arrays may slow down your browser, so keep it reasonable for testing purposes.
Can I generate the same data twice?
No, values are randomly generated each time. If you need reproducible data, copy the result and save it for reuse.
How do I get the generated array?
Use the Copy button to paste into your code, or Download to save as a JSON file. Both options are available after generation.
Is this data suitable for production?
No, this is for testing and development only. Production data should come from your actual database or API, not random generators.