Developers · Design

Spec first. Proxy second. Service third.

Apinizer's API Designer takes an OpenAPI draft, generates a governed proxy, ships a mock, and lists the endpoint in the partner portal — before any service exists.

Five-minute quickstart Open API Designer

OpenAPI-first design — For developers use case overview from Apinizer. — For developers · OpenAPI-first design

The problem

Most teams write specs after they ship. That's how contracts drift.

Engineers ship the service, then write the OpenAPI to match — and the spec ages out the first time a feature ships without a doc update. Apinizer flips the order: the spec is the source of truth. Proxy, mock, portal, contract test — all derived from it. Drift is impossible because there's nowhere for it to live.

Capabilities

What Apinizer does here

Spec authoring in-platform

Draft OpenAPI 3.x in the platform. Reviewers leave comments in place; the spec is the working document, not the export.

One-click proxy generation

Generate a governed proxy from the spec. Auth, rate limits, validation defaults applied — engineers tune from a starting point that's already correct.

Contract-driven mocks

Mock API generated from the same spec. Frontend, partners, and contract tests unblock immediately.

Validation in production

Request and response validation enforced at the gateway against the spec. Bad payloads rejected at the edge with clean errors.

Spec governance

Required fields, naming conventions, deprecation hygiene — checked on every PR. The platform team encodes the rules once; every team gets the lift.

Multi-protocol bridges

OpenAPI fronting a SOAP backend, a gRPC service, or a stored procedure — the proxy translates the contract on the way through.

Use cases

In production, this looks like…

Banking
Istanbul bank ships every new endpoint as a spec PR first
Spec lands in Git; CI runs lint and policy checks. On merge, the proxy and mock generate; partners onboard against the mock the same day.
Manufacturing
Munich OEM unifies 14 plant teams on one spec template
Every plant's APIs follow the same naming, the same auth, the same versioning. New plant onboarded in days, not quarters.
Public sector
Stockholm agency enforces national-standard fields on every spec
Required citizen-ID format, mandatory consent flag, audit-tag — checked in CI. Specs that miss a required field fail review.
Telecom
Madrid carrier auto-generates partner portal pages from spec
Portal pages, code samples, and contract tests all derived from the spec. Partner docs never go stale.
Retail
Amsterdam marketplace runs validation at the edge to reject bad payloads
Pre-existing services kept doing partial validation; Apinizer's spec-driven validation rejects bad calls before backends see them.
Insurance
Milan insurer translates legacy SOAP backends through OpenAPI proxies
Designer specs map to SOAP operations. Modern consumers see clean REST; the legacy backend never changes.
Healthcare
Prague hospital ships FHIR-aligned specs as the contract source
FHIR resources mapped in the spec; downstream EHR translation handled by the proxy. Vendor connectors interoperate by construction.
Government
Baku ministry enforces deprecation hygiene in spec linting
Deprecation policy: each operation must declare a sunset date. CI rejects specs without one; the ministry catches debt before it ships.