Create a Random JSON Array
Generate a JSON array filled with random values. Runs entirely in your browser, so your data never leaves your device.
Output
The result appears here as you type.
How to use Create a Random JSON Array
- 1. Set the Length. Enter how many elements the generated array should contain. There is no input to paste here since this tool builds a new array from scratch each time.
- 2. Choose the Values type. Pick Mixed for a variety of types in one array, or restrict it to Strings, Integers, Numbers or Booleans if you need a uniform array for a specific test case.
- 3. Pick an indent. Choose 2 spaces, 4 spaces or tabs for the generated output so it matches the formatting of the fixture or config file you plan to paste it into.
- 4. Copy the array. Copy the freshly generated array and paste it into a test file, a seed script, or anywhere you need placeholder JSON data without writing it by hand.
When to use Create a Random JSON Array
Create a Random JSON Array generates a JSON array of a chosen length and value type on demand. It is for whenever you need placeholder data quickly rather than crafting a realistic sample by hand, such as testing how code behaves with arbitrary array contents.
- Seeding a mock API endpoint. A frontend prototype needs an endpoint to return an array of numbers before the real backend exists. Generate one here and paste it straight into the mock response.
- Stress-testing a list component. You want to see how a UI renders a long array of mixed values without carefully constructing test data. Generate a large mixed array and drop it straight into the component's props.
- Filling a unit test fixture. A test needs an array of booleans of a specific length to verify a filter function, but the exact values don't matter. Generate one instead of typing true and false repeatedly.
- Populating a demo dashboard. A chart component needs sample numeric data to look populated in a demo before real analytics are wired up. Generate an array of numbers and use it as placeholder data.
Examples
Generate eight mixed values
Output
[ "cedar", 42, true, 17.5, "willow", … ]
About the Create a Random JSON Array tool
Create a Random JSON Array does its work locally, right in the browser. Generate a JSON array filled with random values. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the JSON Tools collection on EditSafely, a set of 90 small, focused JSON utilities that share the same instant, private workspace.
You can shape the output with 3 settings, including Length, Values and Indent, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Create a Random JSON Array free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Does the generator send anything to a server?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How do I get a different result?
Run the generator again. Each run is computed fresh on your device, and any options you change are applied to the next result immediately.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.