Random JSON Generator
Generate random nested JSON for tests, mocks, and schema prototyping.
- 100% client-side · your data never leaves your browser
- Instant, no rate limits
- Free, no sign-up
Overview
Random JSON Generator — Mock Data for Tests
Generate random nested JSON documents for unit tests, UI mocks, load-test fixtures, and schema experiments. Adjust depth to control how deep nesting goes, then copy or download the result. No seeding — each click produces new random strings, numbers, booleans, arrays, and objects.
Why random JSON?
Tests need varied inputs: empty arrays, nested objects, and unexpected types. Hand-writing fixtures is tedious. Random generators stress parsers, serializers, and UI components with diverse structures without copying production data.
Depth control
Lower depth produces shallow objects; higher depth builds nested trees with objects inside arrays inside objects. Use shallow JSON to test forms and simple mappers, and deeper JSON to exercise tree viewers, diff tools, recursive serializers, and performance under nesting.
Mock data without production risk
Copying real API responses into tests leaks customer data and couples fixtures to whatever happened to be in production that day. Generated JSON gives you varied structure — empty arrays, nested objects, mixed types — with zero privacy risk, so tests stay reproducible and safe to commit.
Where to use generated JSON
- Seed unit tests and snapshot fixtures
- Populate UI mocks and Storybook states
- Stress-test parsers, viewers, and diff tools
- Prototype a schema before real data exists
FAQ
Frequently asked questions
How do I generate random JSON?
Set the nesting depth and click generate; JsonDrift builds a random document of objects, arrays, strings, numbers, and booleans that you can copy or download.
Is the data realistic?
Values are random, not domain-specific. It's built for structure and edge-case testing rather than realistic demos.
Is it safe to use in tests?
Yes. It uses no production data and runs locally, so generated fixtures are safe to commit and share.
Can I fix a seed?
Not yet. Click generate again for a new document.
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