nodejs/node

General chat about the Node.js JavaScript runtime

Jordan Harband

@ljharb

yes, of course that's possible

why would it need to be middleware

everything on a node server is JS, so it's all functions

Lorenzo Sandini

@lsandini

Well I understand I can call a function like

var foo = function() {
  // do something
};

app.post('/', function(req, res) {
  console.log(req.body);
  res.send(200);

  foo();
});

... but can I call a whole script ?

Jordan Harband

@ljharb

what is a "script"

everything in node is a file, which is a module

so anything you require is running code

Lorenzo Sandini

@lsandini

Sorry, very new to this. On my server, I started a project in which the npm package "astronomy-bundle" is installed as a module. Then I wrote a "myapp.js" file importing functions from this bundle, and creating the json file that I need. That's where I am stuck. How can I "require" this myapp.js file/module, to be executed as such ? I Understand I can export its various functions using "module.exports", but can I execute the whole file in one step ?

Jordan Harband

@ljharb

node myapp?

Lorenzo Sandini

@lsandini

I appreciate your help, but isn't node myapp a bash command ? How can I trigger it in an express route ? That's where I am baffled...

Jordan Harband

@ljharb

@lsandini yes, it is. inside a node program, you'd require('./myapp') assuming it module.exports = whatever you want to pull in

Lorenzo Sandini

@lsandini

Aah yes I think I got it now. I modified my myapp.js adding the module.exports = ... and also corrected my "require" stuff in app.js. Now the functions I add in my app.post route are called when a POST request is sent to the server :)

Not still there yet, but progressing. I put the work in progress here https://github.com/lsandini/astro but more corrections are needed

"myapp.js" is called "all-mod.js" in my repo

Lakshman

@lakshmankashyap

How can handle big image upload and fetch project with node js optimisation.

Jordan Harband

@ljharb

@lakshmankashyap: i would have answered on irc, but you didn't auth with nickserv.

Lakshman

@lakshmankashyap

let me know how can auth

i start a project so I have no idea that what we use to handle heavy files in nodejs

Jordan Harband

@ljharb

find an npm package

but you can't just dive into any tech, including node - you have to learn it first

Lakshman

@lakshmankashyap

i have 7 year exprience

in nodejs

let me know what package and structure use

Jordan Harband

@ljharb

… i'm not sure how 7 years of experience would translate to those questions being reasonable. someone with a year or two of experience should know how to answer them (search npm for solutions)

Lakshman

@lakshmankashyap

thanks for remind

Lakshman

@lakshmankashyap

If I using pm2 on server so is that need workpool implementation on sever for handle high performance api task?

Htc Saj

@htcsaj123_gitlab

Hello.How to scrape specific word from different posts on subreddit using puppeteer

Lorenzo Sandini

@lsandini

I see questions and answers here, but very uncommonly the finished product, where the solution has been implemented. So here is my "I did this" entry. And thank you again Jordan for your helpfuls hints : https://astro6.herokuapp.com/

I wrote a little API to which you can POST a date, and it will return the heliocentric coordinates of planets, using the excellent "astronomy-bundle" npm package

Github repo here https://github.com/lsandini/astro

The HTML interface is not what it's all about, I plan to send POST requests from another node app and retrieve the sama data in JSON format, like this https://github.com/lsandini/astro/blob/main/ask-api.js

mile-mijatovic

@mile-mijatovic

Hello

I am trying to reuse

const queryParam = (error, result) => {
  if (error) throw error;
  res.status(200).json(result);
};

1 reply

in customerController.js, like this

exports.get_all_customers = (req, res) => {
  const FETCH_CUSTOMERS = "SELECT * FROM Customers";
  db.query(FETCH_CUSTOMERS, queryParam);
};

exports.get_customer = (req, res) => {
  const GET_CUSTOMER_BY_ID = `SELECT * FROM Customers WHERE id = ${req.params.id}`;
  db.query(GET_CUSTOMER_BY_ID, queryParam);
};

4 replies

but I get an error - ReferenceError: res is not defined

I tried to rename resinto result

but then - TypeError: result.status is not a function

lintdeveloper

@lintdeveloper

Hi everyone, I deployed an express app with aws cognito for authentication but when I tried accessing it after deployment on ecs it doesnt work. What might be the issue

1 reply

RafaRed

@RafaRed

What are the best practices to wait for a blockchain number of confirmations and execute an operation in firebase via api? I'm working on a web3 application with a node.js server, I imagine doing this on the client side would be very bad as it would be waiting with the browser locked, but at the same time it seems costly on the server side, for how long it will be waiting for confirmations from several customers. I thought the node.js server would stack the requests in a queue [(hash,blockNumber), (hash,blockNumber)...] and until the queue is clear check for every update in the block, if it can be executed. would there be any better way?

2 replies

jerryphilips

@jerryphilips:matrix.org

[m]

No sense in blocking approved stuff with non-approved stuff blocking the way

Jordan Cech

@jayczech23

Anyone ever have issues using child_process in an Electron app when packaged for Windows?

Duc Nguyen

@nnddominic

Can I downgrate node from 13x to 10x?

RafaRed

@RafaRed

What would be the most appropriate way to create a withdrawal system? The user having virtual currencies (firebase) and exchanging them for ERC20 tokens?

The user makes a request to api and when I receive the request on the node.js server I have to approve first then transfer? should I do it in a contract or a wallet? Is there a way to make these transactions safe and automatic?

KeyboardScript

@SampathKumar27896

Hi all, I have a requirement to send email to # number of users at particular time the user sets in the application. Consider 100 users using my web application, each user sets their preferred timing to receive emails to their inbox. Now I will have 100 different timestamps every day to send email. How we could solve this problem?. Using node js backend.

Stephen James

@sjames1958gm

Sort them by soonest to expire, then you only have to deal with the one that is next to expire.

Jordan Harband

@ljharb

use sendgrid or similar

unless email's your core business, do not waste time or money trying to build something yourself

MERN Micro Framework

@mernjs

Hello Everyone,

MERN Micro Framework provides starter kits for building web, desktop and mobile apps in pure JavaScript.

https://www.npmjs.com/package/create-mernjs-app

If you have any query or suggestions. Please let me know.

Jordan Harband

@ljharb

that's a very brazen name to take for a framework, since it's an established initialism

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