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Step by step React, NodejS and MySQL Simple Full Stack Application 2018 (part: 3)

kmaryam27 profile image Maryam Keshavarz Updated on ・3 min read

In this article I describe developing simple back end for access to database and show table's information with javaScript language

After installing nodeJs from: https://nodejs.org/en/download/ and visual studio code from: https://code.visualstudio.com/download and GitBash from: https://git-scm.com/downloads we can start developing backend of project but before start we need a little knowledge about nodeJS.

* What exactly is Node.js?

Node.js is a JavaScript runtime environment. It is a platform built on Chrome's JavaScript runtime for easily building fast and scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.

* What is Git Bash?

Git bash is a msys shell included in "Git for Windows", and is a slimmed-down version of Cygwin (an old version at that), whose only purpose is to provide enough of a POSIX layer to run a bash. Reminder: msysGit is the development environment to compile Git for Windows.

1- open git bash and make a folder in your selected address for back end example you can make a new folder in Git Bash with #mkdir command and open the folder in VScode environment with #code.. command

2- Add a new .js file to the folder and name it server.js. This file is server of project add below codes to the server.js file:

I tried to explain very brief about per line of codes in server.js in the comment at the picture but for more information you can watch the video on this link: https://expressjs.com/

3- right click on server.js and select open in terminal option and at the terminal with npm init command and answer questions of new file (can answer just by enter) make a new file (package.json)

4- Now with npm install express command install express module on your project to can run it. At the end with node server or node server.js command run your project



5- In this step should make a route to solve Cannot Get / error on our project. So we should make a new folder (routes) and add a new .js file (html-routes.js) to it. After writing html-routes.js and running project you should see Hello from simple-react project on the browser on localhost:3000 address

6- Now we have to connect to the MySQL database. SO we should add some more code for making a connection between database and server on server.js file:

7- Now with npm instal mysql command at the terminal we should add MySQL module to the project. After run we will see below error on the terminal and we have to do another step to fix it. This is an issue in MySQL version 8

put username and password of your database

At the end:


resources:

https://medium.freecodecamp.org/what-exactly-is-node-js-ae36e97449f5
https://www.tutorialspoint.com/nodejs/nodejs_introduction.htm
https://stackoverflow.com/questions/17807485/what-is-the-exact-meaning-of-git-bash

Discussion

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maikpro profile image
Maik

thanks for the tutorial it helps me a lot... :)

But you forgot to pass "connection" from "server.js" to "html-routes". It will give you an error like "connection couldn't be found..."

So you need to change this lines of code:

( in the server.js file )
require('./routes/html-routes')(app);
to => require('./routes/html-routes')(app, connection);

and ( in the html-routes.js )
module.exports = (app) => {...});
to => module.exports = (app, connection) => {...});

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kmaryam27 profile image
Maryam Keshavarz Author

thank you so much for your comment I hadn't that issue but as soon as possible I will check and will update my post

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zizuar profile image
Donald P Polansky

Yup, that's what I was missing too.. I didn't have the auth issue as they already patched that.. but.. Pretty much did a facepalm when I read the comment.
Thanks to both of you!

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rizqiya profile image
Saputra, RW

this comment really help ... thanks

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pala1993 profile image
pala1993

Hi, I followed as you did above but I got below error. Please give me a solution.

dev-to-uploads.s3.amazonaws.com/i/...
Admin@DESKTOP-U13NO8G MINGW64 /c/xampp/htdocs/react_project/mysql-connect
$ node server
internal/modules/cjs/loader.js:985
throw err;
^

Error: Cannot find module './routes/html-routers'
Require stack:

C:\xampp\htdocs\react_project\mysql-connect\server.js at Function.Module._resolveFilename (internal/modules/cjs/loader.js:982:15) at Function.Module._load (internal/modules/cjs/loader.js:864:27) at Module.require (internal/modules/cjs/loader.js:1044:19) at require (internal/modules/cjs/helpers.js:77:18) at Object. (C:\xampp\htdocs\react_project\mysql-connect\server.js:14:1) at Module._compile (internal/modules/cjs/loader.js:1158:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1178:10) at Module.load (internal/modules/cjs/loader.js:1002:32) at Function.Module._load (internal/modules/cjs/loader.js:901:14) at Function.executeUserEntryPoint as runMain { code: 'MODULE_NOT_FOUND', requireStack: [ 'C:\xampp\htdocs\react_project\mysql-connect\server.js' ] }

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lohitha04 profile image
lohitha-04

Thank you so much i found this article. At the last portion of the article i got ER_ACCESS_DENIED_ERROR, sql status: 28000. using my 'mysql database'.
Pls help me how to sort out this.