I've made a javascript https client, based on the browsers Fetch API, with added middleware support. Prebuilt middleware includes JSON, OAuth2.1 and OIDC (OpenID Connect).

Differences with for example Axios, is that middleware can capture both request and response in a single function. Middleware is stackable. It is also completely backwards compatible with the Fetch API.

Direct inspiration came from Express (https://expressjs.com/).

Please let me know what you think of the API, and the developer experience.