Free Online Dummy JSON Data Generator
Generate a JSON array of mock Users, Products, Orders, or records from a custom schema with a custom count — useful for prototyping a UI or seeding a test database without writing data by hand. It helps frontend developers, QA engineers, and API authors populate tables, demos, fixtures, and local databases before production data is available.
Why use mock data?
When building a UI or testing an integration, you often need realistic-looking data before the real backend or database is ready — a table needs rows to render properly, a chart needs numbers to plot, and pagination needs enough records to actually paginate. Hand-writing dozens of fake user records is tedious; this tool generates a ready-to-use JSON array instantly.
How to use this generator
Choose Users, Products, Orders, or Custom Schema, set how many records you want (up to 1,000), and click Generate. Custom schemas support nested objects, arrays, realistic text, contact details, dates, numbers, and more while staying entirely in your browser.
Common use cases
- Populating a UI component (table, list, dashboard) with realistic-looking data before the real API is ready
- Seeding a local development database with test records
- Generating sample data for a demo or presentation
How to use Dummy Data Generator for related tasks
Choose a preset or define a custom schema, generate sample records, and review ranges and fallback values before using the data in tests.
Related tools: GUID Generator, JSON Schema Validator.
Frequently asked questions
Is this data realistic enough for testing?
It's plausible-looking placeholder data — realistic shapes and value ranges (names, emails, prices, statuses) — but randomly generated, not sourced from any real data set. It's meant for UI prototyping, seeding a test database, or mocking an API response, not for anything requiring statistically representative data.
Can I get the same data again later?
No — each generation is freshly randomized, and nothing is saved. Copy or download the output you want to keep.
What is the maximum number of records I can generate?
1,000 per generation, which keeps the tool responsive — for a larger test dataset, generate a few batches and combine them.
Is this data uploaded anywhere?
No — everything is generated entirely in your browser using JavaScript's random number generator. Nothing is sent to a server.
Can I generate data with my own fields?
Yes — choose Custom Schema and enter a JSON object whose values are type keywords such as fullName, email, number:18-65, or array:word:3. Nested objects are supported too.
How do I generate fake JSON data for testing?
Choose a preset for a familiar shape or use Custom Schema to describe fields, nested objects, arrays, and value types directly in the browser.