Again, we want to enforce that your server adheres to the specification. Luckily, we have some fancy middleware that will make sure our requests and responses match the specification. Let’s use express-openapi-validator.

We can then use it as middleware to make sure that our responses are up-to-snuff.

import OpenApiValidator from 'express-openapi-validator';

app.use(
  OpenApiValidator.middleware({
    apiSpec: './openapi.json',
    validateRequests: true,
    validateResponses: true,
  }),
);