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I was used to do the following in some of my express routes.

I am currently working on node.js + express + mongoDB project. I am trying to handle error that occurs when data cannot be received from database. I am simulating this by terminating mongod process in console and calling .get in Postman. Sadly instead of getting an error in Postman I only get Unhandled Promise Rejection in console. I read a lot of posts about error handling and implemented it according to this guide: https://expressjs.com/en/guide/error-handling.html. I would be grateful for any idea of how can I fix this.

The code:

Printing all courses:

I've built and released very simple AjAX/PHP hybrid apps before in the mobile stores (Google and Apple). Now I'm learning nodejs with socketio. I'm using socketio to do bidirectional communications (server-to-client and client-to-server). I'm able to work with it fairly well on development machine pointing to localhost.

Question is : once the apps are deployed in the mobile stores, how is the server supposed to communicate with the client?

On a development machine it's easy to do since it's local. In development, both the server and apps are on localhost. Server on port 3000 and client-app running on port 8000.

Apps released in stores can't be "pointed" to.

This is my simple app which works well when testing locally on all devices and browsers.

index.html

I would like to develop a new web-app in node.js (using express). I am relatively new to node.js world, so I assume there are frameworks that I am not familiar with.

Is there any framework (like Spring for Java) that manages authentication (and save the trouble from the developer)? Or each developer has to write this code over and over again?

Login/Logout is not all. There are other flows:

• registration (create account),
• forgot-password (and then set new password),
• locking/unlocking an account,
• change password

and I think I have covered all flows.

I know that each application has its own UI, forms, maybe with its logo, but the flow itself is similar for most applications. In addition, I know that it is not that hard to implement, but it could be great to have some kind of tool / framework / infrastructure which implements the flows.

Is there such a tool/framework which helps applications' developers and implements these flows?

I've searched this issue but could not find anything.

Thanks!

Trying to follow the Express getting started tutorial.

I generated an app and ran npm install following the provided instructions.

For example if I go to https://google.com/ all files are loaded from Google, except for some defined set of files like all *.css files, which would come from the file system.

Right now I am using Fiddler to achieve that goal, but it is very manual and not easily set up for other developers. If it is possible with Fiddler, I am assuming it is possible to automate that set up. I have tried lots of configurations and researched

If possible I would like to achieve this with webpack-dev-server, or some other scriptable web framework like Express. The developers have access to their host files to make any local DNS changes that might be required. Ideally the set up would work on Windows and Mac, but Windows is the larger target.

Here is an example of what the webpack devserver config might look like:

I have a simple nodejs express server where I am running into an issue where the first request after a long idle time is extremely slow. Eg - 3-4 mins. The same or similar request for the 2nd and 3rd time takes a few milliseconds.

I took a look at this page - https://expressjs.com/en/advanced/best-practice-performance.html and have done the following things -

1. Use gzip compression
2. Set NODE_ENV to production

But I still run into the issue where the first request is extremely slow.

The server is doing the following -

1. At startup I read from a large text file that contains a list of strings. Each of these strings is added to an array. The size of the array is normally around 3.5 million entries.

2. Users provide a string input and I loop over all the entries in the array and search for matches using indexOf and return the matches.

I have also tried increasing the memory for the server --max-old-space-size from 4096 to 8192 but this does not help. I am new to using nodejs/express, please let me know if there is anything else I need to consider/look into.

Thanks.

Here is the source -

On Express Node.js, I have a code like this :

How do you you set up a working server to test CSURF in Postman, as per the CSURF documentation: http://expressjs.com/en/resources/middleware/csurf.html