DEV Community: Rodrigo Cordeiro

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Rodrigo Cordeiro — Sun, 25 Jan 2026 17:45:52 +0000

The 15 Git Commands Every Software Engineer Uses (And Why They Matter More Than You Think)

Hadil Ben Abdallah ・ Jan 20

#programming #git #productivity #codenewbie

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Rodrigo Cordeiro — Fri, 24 Oct 2025 22:36:49 +0000

Adrián Bailador

Mar 9 '25

Creating a .NET API with WebSockets and JWT authentication for real-time chat

#ai #dotnet #csharp #chatgpt

Comments

4 min read

CodeWars: battle for the knowledge

Rodrigo Cordeiro — Fri, 20 Aug 2021 13:01:21 +0000

Você conhece a técnica do patinho de borracha? Inconscientemente todos praticamos ela, mesmo sem conhecê-la. Esta técnica propõe que tentemos explicar conceitos complexos, assuntos que estejamos estudando ou problema que estejamos resolvendo para um objeto inanimado, como um pato de borracha. Na área do desenvolvimento, seria explicar aquele bug que apareceu no código ou aquela feature que você esta planejando ainda.
Bom, vocês serão meus patinhos de borracha.
Vamos solucionar desafios apresentados no CodeWars apresentando minha lógica e convido a todos a apresentar sua própria solução do desafio ou pontos que poderia aprimorar. Vou mostrar como penso, e vocês tem liberdade de responder/corrigir minha lógica.
Vamos lá?

Print page with JS

Rodrigo Cordeiro — Tue, 30 Jun 2020 19:14:44 +0000

Hey Devs, I'm here today to show you something amazing. How to print the page with JS.

Let's suppose you're have a form to fulfill a document and you need to print it. For this we're going to use a simple js function.

For this example, I'm going to use a button calling the function.

<button onclick="imprimir">Imprimir</button>

Then, add the following script

    function imprimir(){
        window.print();
    }

Refresh page using Metatags

Rodrigo Cordeiro — Wed, 17 Jun 2020 19:50:54 +0000

Ok, sometimes we need to refresh a page after an amount of time. Maybe to reload some data, to keep it up-to-date or just during the development that you're styling the page and need to see the changes. For that, one of the possibilities is using the meta tag bellow:

 <meta http-equiv="refresh" content="TIME_TO_RELOAD_ON_SECONDS;URL=PAGE_NAME">

That's all folks!

Blocking user selection on css

Rodrigo Cordeiro — Wed, 17 Jun 2020 19:30:01 +0000

Hey guys, on this tutorial we're going to see how to block a user selection, so, preventing from coping the text.

This is pretty simple and where going to use the `user-select` property. For this example we're going to use a simple paragraph with a lorem ipsum.

<p>
  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam est sem, sodales vitae maximus sit amet, ornare nec ligula. Sed iaculis leo velit, in lobortis libero laoreet faucibus. Aliquam imperdiet sem eget quam dignissim, ut rutrum elit consectetur. Nulla tristique quam et vulputate sagittis. In luctus non nibh at volutpat. Vivamus eleifend pharetra dolor at placerat. Quisque id libero ut sem mollis commodo quis vitae nibh. In tincidunt pharetra venenatis. Nulla facilisi. Phasellus rutrum laoreet lacus, at mattis nunc volutpat et. Nulla facilisi. Phasellus in dui id leo facilisis vehicula. Praesent eleifend augue lectus, id aliquam felis consectetur sit amet. Nullam maximus convallis tortor, non dapibus leo ullamcorper et. Nulla in nunc eleifend, posuere diam vel, volutpat metus. Nullam at mollis tortor.
</p>

So, on the css where going to put the property, it has the following syntax user-select: auto | none | text | all;

-webkit-user-select:none; /* Safari 3.1+ */
-moz-user-select: none;/* Firefox 2+ */
-ms-user-select: none;/* IE 10+ */
user-select: none; /* Standard syntax */

That's all folks!

Problemns with Remote Desktop (MSTSC)

Rodrigo Cordeiro — Mon, 27 Apr 2020 15:59:43 +0000

IT Support tips & quicknotes

Hey guys! Here I'm gonna tell you about some tips and tricks I've learned as IT Analyst working on a Helpdesk company. The complete doc about it can be found here. But now, let's talk about this error:

The remote session was disconnected because there are no remote desktop client access licenses for this computer.

Sometimes, the windows just stop recognizing your access trough mstsc, returning the error that "The remote session was disconnected because there are no remote desktop client access licenses for this computer", I didn't found a good explanation about it yet, but it returns an error, saying to call the network administrator.

To solve this, it's pretty simple:

You will run Regedit
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Delete the MSLicensing key and close regedit
Run the MSTSC as administrator and 'et voilá'!

Creating your own API using NodeJS

Rodrigo Cordeiro — Thu, 23 Apr 2020 19:17:21 +0000

Hey guys, today we're going to build an API using NodeJs and ExpressJS. This will be kind an 'Hello world' api but, maybe we do something more (challenging is always a good deal). Ok, so prepare the coffe and let's code!

Prepare the enviroment

To begin, you need to have the node installed (check the process here, to install it on linux, see this section), it will install the npm too during the process, the npm is the Node Package Manager, used to handle the node packages used on the project.

Now that we have the enviroment, we need to setup the project. For that we will create a folder to keep it and we're gonna call it as 'HelloUniverse' (The 'hello universe' is kind of my initiation rite, a step beyond the hello world. To start off on the right foot) and go into it. Now, let's start the project by running the command npm init -y on the terminal. The npm initcommand initializes the project, asking a few questions to fullfil the information about the project, when used with the -y flag, it creates a project with the basic information. Et voilà, now you can see a package.json file like this:

{
  "name": "HelloUniverse",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

Yes, dev! Can you feel it? That feeling of "Fuck, is being born!!"?

Installing the packages

Ok, now that we have the project we're going to install the packages needed. For the basic step is just the Express, so we'll run the command npm install express -s. After installing it, you can see that it has created the folder node_modules/, on this folder the npm will store the packages installed and his dependencies, and the package-lock.json, this file controls all the dependencies installed and his dependencies (I install **A, and it has the dependencies **B* and C, this file controls this)*.
During the development we're going to use the nodemon package, for that we run the npm install nodemon -D. The -D or --dev flag tell the npm that is a dependency used for developing, not needed on production.

Creating the API

Ok, so, I'm gonna do this like I learned and feels cleaner. To this we're going to create a src folder, resulting on the following structure:

-HelloUniverse/
\_node_modules/
  _src/
  _package.json
  _package-lock.json

Ok, now we go to src/ and create the app.js file and start it importing the express package:

const express = require('express');

Then, we create the instance:

const app = express();

Almost done, now we're going to set the endpoints, or the routes, of our api. For this, we'll set a constant named routes that will handle them.

const routes = express.Router();

And now we create the basic route, the '/':

routes.get('/', (request, response) => {
    return response.send('hello');
})

So, every time it receives a request on '/', it answers with 'hello'. But our api wont hear it yet, we need 2 more steps for that:

app.use(routes) //So the api will use the routes we defined

app.listen(3333) //Here we setted the port the api will listen.

On the end, our code will look like this:

const express = require('express');

const app = express();

const routes = express.Router();

routes.get('/', (request, response) => {
    return response.send('hello');
})

app.use(routes);

app.listen('3333');

Let's add a few tips to make it better:

app.use(express.json()); //Add this before importing the routes (app.use(routes));

Starting the API

All ready, let's run! We're gonna do some tricks to help us, part of that was installing the nodemon. We're going to set npm commands. For this, we go to the package.json and add the following line on the scripts part:

    "start":"nodemon src/app.js"

This means that everytime we run the npm start command, it will call the nodemon and run the src/app.js file. The nodemon will keep watching all files with the .js,.mjs,.json extension. So, our scripts section will be like this:

"scripts": {
    "start":"nodemon src/app.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  }

Now, go to http://localhost:3333 on your browser and see the magic!

Let's play!

Ok, I won't explain here all the kind of parameters you can send on a request because I know it, but don't know how to explain it. So, here is a little guide:

http://localhost.com/:id You can have request params, that are params passed as part of the URL;
http://localhost.com/?id=xxxx you can have query params, that are params passed as queries on the URL;
You can have body params, that are informations sent trough the body of the request;
Or header params, passed trough the header of the params.

The first challenge we're going to do is build a GET request with a request param to show us an especific message. For this, we add the following route:

routes.get('/user/:user', (request, response) => { 
    const user = request.params.user
    return response.send('hello ' + user);
})

So, when you go to http://localhost:3333/user/something, for example, it will return the hello something.

Dev.to API 002 - Creating a Post

Rodrigo Cordeiro — Tue, 21 Apr 2020 23:43:11 +0000

002 - Creating a Post with the API

Ok, now we already know what to do to get the feed and the basic to work with the API, so, now we're going to post something using the API. To this, we must send a POST request to /articles with a the information about the post, see all the parameters possibilities at the api documentation.

curl

curl --request POST  
--url https://dev.to/api/articles  
--header 'api-key: YOUR_API_TOKEN'  
--header 'content-type: application/json'  
--data '{ 
 "article": { 
     "title": "Creating new post", 
     "published": true, 
     "body_markdown": "Hey there, here go some post.", 
     "tags": [ 
         "todayilearned", 
         "showdev" 
     ]
 }
}'

node

var unirest = require("unirest");

unirest.post('https://dev.to/api/articles')
 .type('json')
 .headers({
   'api-key':'YOUR_API_TOKEN'
 })
 .send({
   "article": {
     "title": "Creating new post",
     "published": true,
     "body_markdown": "Hey there, here go some post.",
     "tags": [
       "todayilearned",
       "showdev"
     ]
   }
 })
 .then((response)=>{
   console.log(response.body)
 })

That's all folks!! You can see all the steps on my documentation.

Dev.to API 001 - Starting with the API

Rodrigo Cordeiro — Tue, 21 Apr 2020 04:30:58 +0000

On this doc I'll write about my process of learning to use the api of the dev.to. To requests that needs an authorization, you can use the API Token or OAuth2 authentication. I'm going to use the API Token, so the first step is to acess your account settings and go to the account section (or follow this link) and generate your API Key. Our hello world will be a GET request that retrieves the posts of the feed, you can send some parameters, see all the possibilities at the api documentation.
We are going to send a GET request to https://dev.to/api/articles.

curl

curl https://dev.to/api/articles

node

  var unirest = require("unirest");

  unirest
    .get('https://dev.to/api/articles')
    .then((response)=>{
      console.log(response.body)
    })

This will return a list of objects containing some information about the article and its author, see an example below:

{
    "type_of": "article",
    "id": 315312,
    "title": "I Built an App to Accompany Questlove’s DJ Set in 20 Minutes",
    "description": "Twelve hours of live music, fifteen thousand words of commentary, one Glitch app",
    "cover_image": "https://res.cloudinary.com/practicaldev/image/fetch/s--cdWtimkP--/c_imagga_scale,f_auto,fl_progressive,h_420,q_auto,w_1000/https://dev-to-uploads.s3.amazonaws.com/i/ixvv8wylkr9xwp4b2jvw.png",
    "readable_publish_date": "Apr 20",
    "social_image": "https://res.cloudinary.com/practicaldev/image/fetch/s--eouLbf3o--/c_imagga_scale,f_auto,fl_progressive,h_500,q_auto,w_1000/https://dev-to-uploads.s3.amazonaws.com/i/ixvv8wylkr9xwp4b2jvw.png",
    "slug": "i-built-an-app-to-accompany-questlove-s-dj-set-in-20-minutes-5ep4",
    "path": "/glitch/i-built-an-app-to-accompany-questlove-s-dj-set-in-20-minutes-5ep4",
    "url": "https://dev.to/glitch/i-built-an-app-to-accompany-questlove-s-dj-set-in-20-minutes-5ep4",
    "canonical_url": "https://glitch.com/glimmer/post/questlove-live-prince-music-notes-app",
    "comments_count": 0,
    "positive_reactions_count": 36,
    "collection_id": null,
    "created_at": "2020-04-20T21:49:18Z",
    "edited_at": null,
    "crossposted_at": null,
    "published_at": "2020-04-20T21:58:09Z",
    "last_comment_at": "2020-04-20T21:58:09Z",
    "published_timestamp": "2020-04-20T21:58:09Z",
    "tag_list": [
      "showdev",
      "javascript",
      "node"
    ],
    "tags": "showdev, javascript, node",
    "user": {
      "name": "Anil Dash",
      "username": "anildash",
      "twitter_username": "anildash",
      "github_username": null,
      "website_url": "https://anildash.com/",
      "profile_image": "https://res.cloudinary.com/practicaldev/image/fetch/s--5QdTfjfY--/c_fill,f_auto,fl_progressive,h_640,q_auto,w_640/https://dev-to-uploads.s3.amazonaws.com/uploads/user/profile_image/35740/7a2a5a03-9913-4a5d-a5d8-d89881c5de32.jpg",
      "profile_image_90": "https://res.cloudinary.com/practicaldev/image/fetch/s--_jstlNmz--/c_fill,f_auto,fl_progressive,h_90,q_auto,w_90/https://dev-to-uploads.s3.amazonaws.com/uploads/user/profile_image/35740/7a2a5a03-9913-4a5d-a5d8-d89881c5de32.jpg"
    },
    "organization": {
      "name": "Glitch",
      "username": "glitch",
      "slug": "glitch",
      "profile_image": "https://res.cloudinary.com/practicaldev/image/fetch/s--rVDCwPJW--/c_fill,f_auto,fl_progressive,h_640,q_auto,w_640/https://dev-to-uploads.s3.amazonaws.com/uploads/organization/profile_image/609/d36daa95-5d60-4559-a0cd-f234d10ef61d.png",
      "profile_image_90": "https://res.cloudinary.com/practicaldev/image/fetch/s--S4GfcNfo--/c_fill,f_auto,fl_progressive,h_90,q_auto,w_90/https://dev-to-uploads.s3.amazonaws.com/uploads/organization/profile_image/609/d36daa95-5d60-4559-a0cd-f234d10ef61d.png"
    },
    "flare_tag": {
      "name": "showdev",
      "bg_color_hex": "#091b47",
      "text_color_hex": "#b2ffe1"
    }
  }

You can see all the steps on my documentation

Hello API!

Rodrigo Cordeiro — Tue, 21 Apr 2020 03:30:29 +0000

Hello Devs, This is my first post and I'm doing it trough the API.