What is MockNova?

MockNova is a privacy-first data engine that runs entirely in your browser. It lets developers generate up to 100k rows of complex relational data, clean messy logs with "Magic Extract," and mock APIs locally using MSW—all without a backend. No data ever leaves your machine, there are zero paywalls, and you never need to sign up. It's a fast, free tool for generating, cleaning, and anonymizing data on the fly.

Who it's for

• Frontend developers who need realistic test data and local API mocking without spinning up a server
• Data analysts who want to clean messy CSV, Excel, or JSON files—standardize dates, fix casing, remove duplicates, and impute missing values
• Testers and QA engineers who need to stress-test applications with dirty data using "Chaos Mode" or anonymize PII for safe testing

Key features

Mock Data Generator

Create up to 100k rows of realistic relational data with custom schemas and logic. Define relationships between tables, set field constraints, and generate exactly the data you need—all client-side.

Magic Extract

Clean messy logs and unstructured data with a single click. MockNova's "Magic Extract" intelligently parses and structures raw text, saving hours of manual cleanup.

Local API Mocking with MSW

Mock APIs locally using Mock Service Worker (MSW). Intercept network requests and return generated data without ever hitting a real server—perfect for frontend testing and development.

Chaos Mode

Test your application's resilience with deliberately dirty data. Chaos Mode injects edge cases, malformed entries, and unexpected values to ensure your code handles real-world messiness.

What stands out

"Fast, free, and built for speed—stop fighting with limits and start building."

MockNova is the only tool that combines a data generator, data cleaner, anonymizer, and API mocking server in one zero-cost, zero-signup package. Everything runs 100% client-side, so your data never touches a server. No enterprise subscriptions, no hidden limits, and no data leaving your machine.

Worth checking out if…

You're tired of hitting row limits on other data generators, need to clean and anonymize data without exposing it to a third party, or want a fast way to mock APIs locally. MockNova is ideal for frontend testing, SQL practice, data science experiments, and any workflow where privacy and speed matter more than enterprise overhead.