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FixtureKit
Turn TypeScript interfaces into realistic mock data
FixtureKit is a free, entirely browser-based tool that uses semantic inference to turn TypeScript interfaces or Zod schemas into realistic mock data. Copy as raw TS, JSON, MSW handlers, or Playwright route mocks. Features an Adversarial Mode to stress-test your UI.
This solves one of those small dev chores that somehow eats half an afternoon.
I like that it starts from the schema I already have, instead of making me set up Faker rules from scratch. The Playwright and MSW exports are probably where I’d use it most, because mock data is much more useful when it can drop straight into tests or local dev.
Adversarial Mode is a nice idea too. Tables, forms, and profile screens always look fine until one weird string, empty value, or unsafe input shows up.
This is super helpful actually, i'm a SWE and this tool helps me in local development, thanks.
About FixtureKit on Product Hunt
“Turn TypeScript interfaces into realistic mock data”
FixtureKit was submitted on Product Hunt and earned 32 upvotes and 8 comments, placing #12 on the daily leaderboard. FixtureKit is a free, entirely browser-based tool that uses semantic inference to turn TypeScript interfaces or Zod schemas into realistic mock data. Copy as raw TS, JSON, MSW handlers, or Playwright route mocks. Features an Adversarial Mode to stress-test your UI.
FixtureKit was featured in Web App (122.4k followers), Software Engineering (42.6k followers), Developer Tools (514k followers) and GitHub (41.3k followers) on Product Hunt. Together, these topics include over 137.3k products, making this a competitive space to launch in.
Who hunted FixtureKit?
FixtureKit was hunted by Wasef Salamat. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Wasef Salamat
Hey Product Hunt! 👋
I built FixtureKit because I kept wasting the first 20 minutes of
every project writing the same mock objects by hand. mockUser,
mockProduct, mockOrder -- all manually typed, all instantly outdated
the moment I changed the interface.
Every TypeScript dev knows this pain. Your types are perfect, but
your test data is a mess of "string", "string", 123.
The thing that bothered me most was that other tools either require
installation, send your schema to a server, or just fill everything
with meaningless placeholders. I wanted something that runs in the
browser, understands what field names mean, and gives you something
that actually looks real.
So FixtureKit infers from the field name -- email gets a real email,
price gets a real number, createdAt gets an ISO date. It's
deterministic so the output is safe to commit. And it supports MSW
and Playwright output so it plugs into the testing stack most
TypeScript teams already use.
Would love to hear what schema patterns break it -- that's the most
useful feedback I can get right now.