Developer tool · Free · No sign-up
Mock JSON Generator
Generate fake API data and mock JSON payloads instantly.
Schema
JSON Output
// Click 'Generate JSON' to see mock data here...
About this tool
Frontend developers often need fake data to build and test UIs before the backend API is ready. This tool lets you define a schema (field names and data types) and instantly generate a JSON array of mock records. It handles UUIDs, names, emails, dates, and booleans locally in your browser, providing a fast and private way to mock up APIs.
Key features
Dynamic Schema Builder
Add custom field names and assign them realistic data types.
Batch Generation
Generate up to 100 fake JSON records in a single click.
Zero Dependencies
Uses native browser APIs for random data generation. No server calls.
How to use it
- 1Add the fields you need (e.g., id, name, email).
- 2Select the appropriate data type for each field.
- 3Set how many mock records you want to generate.
- 4Click 'Generate JSON' and copy the output to use in your code.
Common use cases
- Populating a React DataTable before the backend is built.
- Testing frontend form validation with various data types.
- Generating mock payloads to test API POST requests in Postman.
Frequently asked questions
What data types are supported?
UUIDs, Names, Emails, Numbers, Booleans, Dates, and Lorem Ipsum text. We use native browser APIs to ensure the data is random and realistic.
Is the generated data unique?
UUIDs are mathematically unique. Names and emails are pulled from a finite pool, so they may repeat in very large datasets, which is normal for mock data.
Is my schema saved?
No. The schema resets on page refresh. It is designed for rapid prototyping during a single development session.
Private and free. Most of our tools run entirely in your browser, so the data you enter isn't uploaded or stored. There's no sign-up, and there never will be — they're built by the Fusion Trail Solutions team to be genuinely useful.
Need a custom tool or web app?
We design and build production-grade web apps, internal tools and SaaS platforms. Tell us what you need.
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