I am currently struggling to run my Node.js server. What I want to do: Upload a CSV-File from mobile device to my local server and save it on the file system Read each line of the .csv-File and save each row to my MongoDB database Uploading and saving the file works flawlessly. Reading the .csv-File and saving each row to
Tag: node.js
How to generate unique ID with node.js
How to set a variable value with database query callback? How I can do it? Answer It’s been some time since I used node.js, but I think I might be able to help. Firstly, in node, you only have a single thread and are supposed to use callbacks. What will happen with your code, is that base.getID query will get
NodeJS: Would App Run Faster if Freeze Objects?
Most of my objects/functions do not change. Would the application run faster if I freeze most of the objects via Object.freeze(object)? Or will it make no difference at all? Answer Freezing (and sealing) causes a signficant performance hit instead of a gain across various browsers. Just take a look at some of the jsperf benchmarks. EDIT: Here’s the relevant issue
Unable to run node app.js file
I am learning node.js and I am trying to run the app.js file using the command node app.js but the bash returns nothing (no errors either). Here are the steps I followed: $ brew install node $ sudo npm install -g express $ sudo npm install -g express-generator after i get into a new folder I created I run $
What does it mean by “message queue” in this link?
I was trying to understand what’s an event loop in JavaScript. Came across Mozilla Developer Network’s link about event loop. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/EventLoop It mentions Queue A JavaScript runtime contains a message queue, which is a list of messages to be processed. To each message is associated a function. When the stack is empty, a message is taken out of the queue
Create an array with all numbers from min to max without a loop
I have two numbers, min and max, and I want to create an array that contains all number between them (including min and max). The most obvious approach is to use a for loop for this, and push the single values onto an array. Nevertheless, this seems to be a quite naive approach, i.e. it’s imperative programming. Now I was
Is it necessary to set a Content-Type in Node.js?
Just started playing with Node.js and after seeing a few examples I see that usually the Content-Type is set before returning some content. Usually something like this for HTML: For image: I read the docs for .write() and it says if no header is specified “it will switch to implicit header mode and flush the implicit headers” With some testing
How to add rooms in Node.js with Socket.io?
I have been following up many articles to learn making chat application with Node.js and Socket.io. Everything is clear and I can make an application moving messages from client to server and emitting to all etc but only one thing is not clearing and cannot figure this out. How can I add rooms to io.sockets.manager.room? What is the code to
How to create a simple http proxy in node.js?
I’m trying to create a proxy server to pass HTTP GET requests from a client to a third party website (say google). My proxy just needs to mirror incoming requests to their corresponding path on the target site, so if my client’s requested url is: The following resource should be served: Here is what I came up with: It works
On an EventEmitter, how can I know all the events I can listen to?
Supposing I have an object that inherited from EventEmitter, like a stream or any other, is there a good way to know all the events I can listen to, and all the attached event listeners ? I think the second part of the question is easy, emitter.listeners(event) will tell me all the listeners to an event. But is there a