middleware

Use specific middleware in Express for all paths except a specific one

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I would add checkUser middleware to all my paths, except homepage. app.get(“https://stackoverflow.com/”, routes.index); app.get(‘/account’, checkUser, routes.account); or app.all(‘*’, checkUser); function checkUser(req, res, next) { if ( req.path == “https://stackoverflow.com/”) return next(); //authenticate user next(); } You could extend this to search for the req.path in an array of non-authenticated paths: function checkUser(req, res, next) { … Read more

req.locals vs. res.locals vs. res.data vs. req.data vs. app.locals in Express middleware

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As you mentioned, both req.locals, res.locals or even your own defined key res.userData can be used. However, when using a view engine with Express, you can set intermediate data on res.locals in your middleware, and that data will be available in your view (see this post). It is common practice to set intermediate data inside … Read more

How can I enable CORS on Django REST Framework

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The link you referenced in your question recommends using django-cors-headers, whose documentation says to install the library python -m pip install django-cors-headers and then add it to your installed apps: INSTALLED_APPS = ( … ‘corsheaders’, … ) You will also need to add a middleware class to listen in on responses: MIDDLEWARE = [ …, … Read more

What is middleware exactly?

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Lets say your company makes 4 different products, your client has another 3 different products from another 3 different companies. Someday the client thought, why don’t we integrate all our systems into one huge system. Ten minutes later their IT department said that will take 2 years. You (the wise developer) said, why don’t we … Read more

Passing variables to the next middleware using next() in Express.js

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This is what the res.locals object is for. Setting variables directly on the request object is not supported or documented. res.locals is guaranteed to hold state over the life of a request. res.locals (Note: the documentation quoted here is now outdated, check the link for the most recent version.) An object that contains response local … Read more

What is Node.js’ Connect, Express and “middleware”?

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[Update: As of its 4.0 release, Express no longer uses Connect. However, Express is still compatible with middleware written for Connect. My original answer is below.] I’m glad you asked about this, because it’s definitely a common point of confusion for folks looking at Node.js. Here’s my best shot at explaining it: Node.js itself offers … Read more

bodyParser is deprecated express 4

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It means that using the bodyParser() constructor has been deprecated, as of 2014-06-19. app.use(bodyParser()); //Now deprecated You now need to call the methods separately app.use(bodyParser.urlencoded()); app.use(bodyParser.json()); And so on. If you’re still getting a warning with urlencoded you need to use app.use(bodyParser.urlencoded({ extended: true })); The extended config object key now needs to be explicitly … Read more