A mock API for demos that don’t fall apart on stage.
Demos die when the data lies — a click leads to a 404, an order points at a customer who doesn’t exist. Mocksmith gives you a hosted mock whose data connects and stays the same every run.
The moment a demo breaks
You click into an order on stage, tap through to the customer, and the screen shows an error. The mock faked each endpoint on its own, so the IDs never matched. Here’s the difference coherence makes.
GET /orders/42
{
"id": 42,
"customerId": "9f3b1c7e-44a2-4f08-bd31",
"total": 129.00
}
GET /customers/9f3b1c7e-44a2-4f08-bd31
→ 404 Not FoundThe customerId points at a customer that doesn't exist. Your flow breaks the moment it follows the link.
GET /orders/42
{
"id": 42,
"customerId": 318,
"total": 129.00
}
GET /customers/318
{
"id": 318,
"name": "Alice Tan",
"email": "alice.tan@example.com"
}customerId: 318 resolves to the same realistic customer — everywhere it appears across your API.
When the whole dataset is generated together, every link in your demo lands on something real.
Built for the demos you can’t afford to fumble
Walk a prospect through a real flow — click an order, land on its customer, open their invoices — without a single dead link breaking the story.
Show a product that looks shipped. A coherent dataset reads as a working backend, not a slide deck with placeholder rows.
Put believable data behind the UI so reviewers react to the real experience instead of “Lorem ipsum” and user-12345.
Build and demo the interface against a hosted mock while the real API is still in progress, then swap the base URL when it lands.
The same believable world, every single run
A scripted demo only works if the data doesn’t move under you. Mocksmith’s output is deterministic: the customer you rehearsed with is the customer on the call, down to the same totals and IDs.
It’s a hosted mock, so there’s nothing to boot up in the room — see how the OpenAPI mock server works or read how teams build the frontend before the backend exists.
Mock API for demos FAQ
Can I demo without a backend at all?
Yes. Mocksmith gives you a hosted mock URL generated from your OpenAPI spec. Point your app at it and every endpoint returns realistic, connected data — no server to deploy or keep running.
Will the data be the same every time I run the demo?
Yes. The dataset is deterministic, so a rehearsal and the live call show the identical world. You can script a walkthrough knowing the same customer, order, and totals appear every time.
Why not just use static JSON or a Mockoon file?
Hand-made fixtures fake each response separately, so IDs stop matching the moment your demo follows a link between two screens. Mocksmith generates one coherent dataset, so those links hold up.
Can the mock look like my actual product’s data?
It mirrors the shape of your OpenAPI spec and fills it with values chosen by field meaning — emails look like emails, prices like prices — so the demo resembles your real domain rather than random noise.
Get a demo-ready mock API
Mocksmith is in early access. Leave your email and we’ll reach out as we open up access.
We'll email you when your spot opens — feature requests welcome.