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How middlewares work in Auth0 ?



In the React JS tutorial, you use a middleware, where is it coming from ?? I can’t find it in the code ? can’t understand how come it works.

This is exactly the code and this is the page:

app.get(’/api/jokes/celebrity’, authCheck, (req,res) => {


The first code snippet in the Build The Back-End section contains the definition of the authCheck middleware assuming that was what you’re referring to.