var d=Object.defineProperty,c=Object.defineProperties;var m=Object.getOwnPropertyDescriptors;var F=Object.getOwnPropertySymbols;var o=Object.prototype.hasOwnProperty,t=Object.prototype.propertyIsEnumerable;var l=(e,n,s)=>n in e?d(e,n,{enumerable:!0,configurable:!0,writable:!0,value:s}):e[n]=s,a=(e,n)=>{for(var s in n||(n={}))o.call(n,s)&&l(e,s,n[s]);if(F)for(var s of F(n))t.call(n,s)&&l(e,s,n[s]);return e},r=(e,n)=>c(e,m(n));var i=(e,n)=>{var s={};for(var p in e)o.call(e,p)&&n.indexOf(p)<0&&(s[p]=e[p]);if(e!=null&&F)for(var p of F(e))n.indexOf(p)<0&&t.call(e,p)&&(s[p]=e[p]);return s};const layoutProps={},MDXLayout="wrapper";function MDXContent(s){var p=s,{components:e}=p,n=i(p,["components"]);return mdx(MDXLayout,r(a(a({},layoutProps),n),{components:e,mdxType:"MDXLayout"}),mdx("p",null,"This involved generating an HTML file containing a Sudoku grid and a Solve button, with the code extracting the grid values and forwarding them to an API endpoint. Upon receiving the response data, the code solved the puzzle and populated the grid with the solution. Additionally, the guide covered how to style the grid with CSS."),mdx("p",null,"Moving forward, this section of the guide will tackle a few minor issues that need to be addressed. Moreover, it will guide the building of a secure mini backend in Node.js that can be utilized to store API keys. You can optimize your Sudoku-solving process by following the steps in this guide."),mdx("h2",a({},{id:"step-1"}),mdx("a",a({parentName:"h2"},{href:"#step-1"}),"Step 1:")),mdx("p",null,"Storing the API key in the code is not recommended due to security concerns. Saving it on GitHub can lead to unauthorized access, theft, and unauthorized usage, which may result in unexpected charges, especially if it's a paid API. To avoid this, do not share or upload your API key. Instead, consider hiding it using process en visa by creating a ",mdx("inlineCode",{parentName:"p"},".env")," file to store it."),mdx("p",null,"Let's create a ",mdx("inlineCode",{parentName:"p"},".env")," file and name it ",mdx("inlineCode",{parentName:"p"},"Rapid_API_Key"),". Then, I will remove the key from the ",mdx("inlineCode",{parentName:"p"},"app.js")," file and store it in the new file. I have developed a small backend to ensure secure API key storage. Nevertheless, it is necessary to acquire the package for this to function properly."),mdx("p",null,"To create a backend, the first step would be to open the terminal and execute the following command:"),mdx("pre",a({},{className:"shiki Shades of Purple",style:{backgroundColor:"#2D2B55",color:"#FFFFFF"}}),mdx("div",a({parentName:"pre"},{className:"language-id"}),"sh"),mdx("div",a({parentName:"pre"},{className:"code-container"}),mdx("code",{parentName:"div"},mdx("div",a({parentName:"code"},{className:"line"}),mdx("span",a({parentName:"div"},{style:{color:"#FFFFFF"}}),"npm init")),mdx("div",a({parentName:"code"},{className:"line"}))))),mdx("p",null,"This command initializes a new Node.js project in the current directory. It prompts you to provide some basic information, such as the package name, version, description, entry point, test command, and other details required for the project."),mdx("p",null,"After running the above command, a ",mdx("inlineCode",{parentName:"p"},"package.json")," file is generated in the current directory with default values for various fields. You can use this file to manage dependencies and scripts for your Node.js project."),mdx("p",null,"If you do not have npm installed on your system, follow the step-by-step guide on this ",mdx("a",a({parentName:"p"},{href:"https://docs.npmjs.com/downloading-and-installing-node-js-and-npm"}),"link")," to download and install it."),mdx("h2",a({},{id:"step-2"}),mdx("a",a({parentName:"h2"},{href:"#step-2"}),"Step 2:")),mdx("p",null,"Once you have created the ",mdx("inlineCode",{parentName:"p"},"package.json"),` file, you can create a new JavaScript file at the same level as the others. 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"),mdx("span",a({parentName:"div"},{style:{color:"#A5FF90"}}),"width"),mdx("span",a({parentName:"div"},{style:{color:"#E1EFFF"}}),":"),mdx("span",a({parentName:"div"},{style:{color:"#9EFFFF"}})," "),mdx("span",a({parentName:"div"},{style:{color:"#FFEE80"}}),"450px"),mdx("span",a({parentName:"div"},{style:{color:"#E1EFFF"}}),";")),mdx("div",a({parentName:"code"},{className:"line"}),mdx("span",a({parentName:"div"},{style:{color:"#9EFFFF"}})," "),mdx("span",a({parentName:"div"},{style:{color:"#A5FF90"}}),"height"),mdx("span",a({parentName:"div"},{style:{color:"#E1EFFF"}}),":"),mdx("span",a({parentName:"div"},{style:{color:"#9EFFFF"}})," 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"),mdx("span",a({parentName:"div"},{style:{color:"#FFEE80"}}),"none"),mdx("span",a({parentName:"div"},{style:{color:"#E1EFFF"}}),";")),mdx("div",a({parentName:"code"},{className:"line"}),mdx("span",a({parentName:"div"},{style:{color:"#E1EFFF"}}),"}")),mdx("div",a({parentName:"code"},{className:"line"})),mdx("div",a({parentName:"code"},{className:"line"}),mdx("span",a({parentName:"div"},{style:{color:"#E1EFFF"}}),"#"),mdx("span",a({parentName:"div"},{style:{color:"#FFB454"}}),"solve-button"),mdx("span",a({parentName:"div"},{style:{color:"#E1EFFF"}}),":"),mdx("span",a({parentName:"div"},{style:{color:"#FFB454"}}),"hover"),mdx("span",a({parentName:"div"},{style:{color:"#FFFFFF"}})," "),mdx("span",a({parentName:"div"},{style:{color:"#E1EFFF"}}),"{")),mdx("div",a({parentName:"code"},{className:"line"}),mdx("span",a({parentName:"div"},{style:{color:"#9EFFFF"}})," "),mdx("span",a({parentName:"div"},{style:{color:"#A5FF90"}}),"background-color"),mdx("span",a({parentName:"div"},{style:{color:"#E1EFFF"}}),":"),mdx("span",a({parentName:"div"},{style:{color:"#9EFFFF"}})," "),mdx("span",a({parentName:"div"},{style:{color:"#E1EFFF"}}),"#"),mdx("span",a({parentName:"div"},{style:{color:"#FFEE80"}}),"c96f4c"),mdx("span",a({parentName:"div"},{style:{color:"#E1EFFF"}}),";")),mdx("div",a({parentName:"code"},{className:"line"}),mdx("span",a({parentName:"div"},{style:{color:"#E1EFFF"}}),"}")),mdx("div",a({parentName:"code"},{className:"line"}))))),mdx("p",null,"This is the final look of the Sudoku solver web application after implementing the Sudoku solving algorithm and adding styling to the web page. "),mdx("p",null,"The Solve button is styled with a custom background color, font color, padding, margin, and border-radius to give the application a polished look. Overall, the web application is fully functional and visually appealing."),mdx("img",a({},{src:"https://devrelstack.kinsta.cloud/wp-content/uploads/2023/04/16.-Final-output-of-Sudoku-Puzzle.png",alt:"Final output of Sudoku Puzzle"})),mdx("h2",a({},{id:"wrap-up"}),mdx("a",a({parentName:"h2"},{href:"#wrap-up"}),"Wrap up")),mdx("p",null,"\u200B\u200BThe project involves building a Sudoku puzzle solver app using JavaScript. Initially, the app used an external API to solve the puzzle, but the API key was exposed on the front end. "),mdx("p",null,"To address this, the backend was modified to hide the API key and handle the solving of the puzzle. This involved creating a route for an HTTP POST request and sending a JSON payload to the server. The response from the server was then parsed and displayed on the front end. 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error handling

Error handling with the Fetch API

Error handling can make or break a Fetch API request. In this guide, we'll learn how to handle errors and optimize your data fetching.