Your OpenAPI spec is already a test plan — here's how to turn it into Playwright tests automatically

If you're writing Playwright API tests manually from an OpenAPI/Swagger spec, you're doing work that should be automated. Every endpoint in your spec already tells you: What the request looks like (path, method, parameters, body schema) What responses to expect (200, 401, 404, 422...) What fields are required What security is needed That's not documentation — it's a test plan. You're just not running it yet. What I built I got tired of the boilerplate loop: read spec → write happy path → add 401 test → add missing-field test → repeat for 40 endpoints. So I built a tool that does it for you. swagger-to-playwright.vercel.app takes your OpenAPI 3.x spec (YAML or JSON) and generates a ready-to-run Playwright .spec.ts file. For each endpoint, it produces four tests: 1. Happy path — calls the endpoint with valid data, asserts 2xx response and key fields in the body. 2. Auth check — if your spec declares a security scheme, it calls without a token and asserts 401. Only generated when the spec actually says authentication is required — no false positives. 3. Input validation — sends a request with missing required fields (or wrong types, invalid enums) and asserts 422. Reads directly from your schema's required array and field types. 4. Contract validation — if there's a path parameter, it calls with an invalid value and asserts 404. What the output looks like Here's what you get for a POST /users endpoint with email and password required: import { test , expect } from ' @playwright/test ' ; test . describe ( ' POST /users ' , () => { test ( ' happy path — creates user successfully ' , async ({ request }) => { const res = await request . post ( ' /users ' , { data : { email : ' test@example.com ' , password : ' password123 ' } }); expect ( res . status ()). toBe ( 201 ); const body = await res . json (); expect ( body ). toHaveProperty ( ' id ' ); }); test ( ' auth — 401 without token ' , async ({ request }) => { const res = await request . post ( ' /users ' , { headers : {