Generate Random JSON
Quickly generate random JSON data structures. Runs entirely in your browser, so your data never leaves your device.
Output
The result appears here as you type.
How to use Generate Random JSON
- 1. Set the key count and nesting depth. Enter Keys to control roughly how many properties appear per object, and Max depth to limit how many levels of nested objects the generator creates.
- 2. Pick an indentation style. Choose 2 spaces, 4 spaces, or Tabs from the Indent setting to match whatever formatting convention your project or test fixtures already use.
- 3. Copy the generated JSON. Copy the structure from the output pane and paste it into a mock API response, a unit test fixture, or a sample config file wherever placeholder data is needed.
When to use Generate Random JSON
Generate Random JSON produces a nested object of random keys, strings, numbers, and booleans whenever you need sample structured data without writing it field by field. Depth and key count are both configurable so the output matches the shape you are testing.
- Mocking an API response. You are building a frontend before the backend endpoint exists and need a plausible-looking JSON payload with nested objects to wire up rendering logic against.
- Testing a JSON parser's depth limits. You wrote a recursive descent parser and want to confirm it handles deeply nested objects without stack overflow, so you generate JSON at increasing Max depth values.
- Seeding a NoSQL test database. You need sample documents to insert into a test MongoDB collection to check query and indexing behavior on nested fields, without hand-typing dozens of records.
- Demonstrating indentation settings. You are writing documentation about JSON formatting conventions and want quick side-by-side examples generated with 2 spaces, 4 spaces, and tabs.
Examples
Generate a two-level object of random data
Output
{
"cedar": 42,
"willow": {
"quartz": true,
"ember": "raven"
},
…
}About the Generate Random JSON tool
Generate Random JSON does its work locally, right in the browser. Quickly generate random JSON data structures. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Random Tools collection on EditSafely, a set of 120 small, focused Random utilities that share the same instant, private workspace.
You can shape the output with 3 settings, including Keys, Max depth 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 Generate Random JSON 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.