I am trying to merge arrays from a request to already existing arrays in a MongoDB database. When I printed the output of the request, the arrays did not merge. What seems to be the issue here? Answer concat() method Your result is the expected behavior of concat method. From MDN documentation: The concat() m…
Tag: express
node.js express permission error on linux
using arch with admin user account and no sudo on this script: i get this error that didnt change when i changed the port or the url to trigger it it instantly gives me this error after i run the command: node site.js (the code above is site.js) if i run the script with sudo it works fine but i
Node js shared variables and multiple users and multiple entry-points
I have an node-js application that I’m switching from a single-tenant database to a multi-tenant database. The application code is called from an express api but there are also services that run through a different entrypoints, so req.session is not always available. Currently I have database function c…
collection.find({}) doesnt work after many tries
I am building an api with express and mongoose and im usingdb.collection(collection).find({}) expecting that i get all of my docs back (3 test docs in total) as seen from tutorials. It doesnt give me any errors when im executing a req from postman and that confuses me as im geting nothing, not even an empty o…
Reactjs- Edit form not updating the database table
I am trying to create an edit form that will enable me update data in a table. When I click on the ‘edit’ button on my table it correctly redirects me to the edit form and data is also being correctly filled into the respective fields of the form, no issue there. The only issue I am facing is that
Puppeteer not picking up dialog box
I’m trying to test for an alert box in Puppeteer: However, it doesn’t seem to return the message inside the alert box (even though I’ve confirmed it works doing it manually). Any ideas why page.on(‘dialog’, async dialog => { isn’t being entered? Answer I’m not sure…
Access to XMLHttpRequest at ‘http://localhost:8080/’ from origin ‘http://localhost:3000’ has been blocked by CORS policy
Full error: “Access to XMLHttpRequest at ‘http://localhost:8080/api/tutorials’ from origin ‘http://localhost:3000’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is presen…
Get a response in chunks from express in browser
I’m building a progress bar for some long-running server-side tasks (up to a few minutes), and I’d like a way to display the progress of the task. I could use WebSockets or poll on intervals, but I don’t want to keep track of each task. Instead, I’d like to use long-polling and write p…
How to separate CRUD routes on Node.js and Express?
when you want to have all CRUD operations of your model in one file it’s done in such a way as our 1st method: routes.js users.js BUT what if we want to want to have separate files for CRUD in this form as a 2nd method ? users |__patchUser.js |__deleteUser.js |__index.js I expect the index file to be si…
Why is the client not receiving the socket.io broadcast (rooms)?
My client is not receiving the broadcast sent to the room. If I replace socket.to(roomName).emit(‘join’, currentUser); with socket.emit(‘join’, currentUser); the client receives the broadcast, but I’d like to use rooms here. Any help would be greatly appreciated. app.js game.ejs …