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JSON Mock Data Generator

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Generate randomized mock JSON records from a sample shape.

100% Client-Side Processing • Your Data Never Leaves Your Browser

About JSON Mock Data Generator

Paste a sample JSON object and generate any number of randomized records that match its shape — string fields are filled with realistic-ish words, names, or emails based on the key name, numbers and booleans are randomized, and nested objects/arrays keep their structure.

Use it to quickly create fixture data for a UI prototype or test suite without writing it by hand. Generation happens entirely in your browser.

Key Features

Generates realistic-ish names, emails, ids, and dates by field name
Preserves the shape of nested objects and arrays
Configurable record count