Guide: Linting JavaScript using JSHint: Complete Guide
Linting in computer programming is the process of static analysis code to find problems such as wrong syntax and unclear code usageThe tool used for lint formation is known as a lint or linter. One of the linters available for JavaScript today is JSHint. JSHint is available for multiple platforms. The online web tool most of us are familiar with is at jshint.com. There are also the command line utility via Node.js, a JavaScript API multiple text editors and IDE plugins for JSHint. You can view the full list of available JSHint tools for different environments on the download and installation page of the JSHint website. According to the website, the two most common ways the JSHint tool is used are the command line tool and the APILet’s take a look at how to download both, along with other linting options the tools provide.
Via command line tool
If you don’t have Node.js installed on your computer, then you need to go to the website and download and install it first. To check if Node.js has been installed successfully, you can run the npm -version command in the command line interface (CLI) and it will show you the version of the Node.js on your computer (or you can just run the npm command and see what happens). To install the JSHint tool, run the npm install jshint command in CLI. To check if JSHint has been installed successfully, run the jshint -version command to see the version. Once this step is over, the installation is complete. To run the tool, go to the folder in the CLI where your JavaScript file (say test.js) is located and run the command jshint test.js. The result of the tool’s analysis on your JavaScript code will appear (something like this):
Via the JavaScript API
Download the compressed file from this GitHub link and extract it. In the dist folder you will find the jshint JS file (the API library).
To use the API, add the jshint JS file to your project and link it to your page. The API is accessible in the JavaScript code using the function / object called JSHINT. Below is an example HTML code that uses the JSHint JavaScript API to analyze the JavaScript code in the source array and display the analysis results on the page.
<! DOCTYPE html>
We passed the source array containing the JavaScript source code to be parsed, and the options object containing the linting options (we’ll get to options shortly) as parameters to the JSHINT function. The analysis result (a JSON object) is retrieved from the JSHINT function property data.
JSON.stringify is used here for display only, to display the result of the data function in string format on the page. The embellished JSON string looks like this. The highlighted parts are the errors found by JSHint, worded in simple sentences.
Linting options
The lint options allow us to configure the linting process. We can specify which types of errors or wanring should be clarified and which should not. In the previous example, two linting options were used, undef and unused. undef option marks undeclared variables, and undef marks variables that have been declared but never used. Like this one, there are many more options that you can see a list of on this page, if you want to search an option there is a search bar in the top right corner. If you are using the CLI tool through Node.js, you can write the linting options in a package.json file under the jshintConfig property in the same directory. You can also add the options as guidelines in the JavaScript code. // – test.js – / * jshint undef: true, unused: true * / foo (); a = 7; There are more ways to configure linting options in your project based on the tool you are using. View the different ways to configure here.
Linting JavaScript using JSHint: Complete Guide: benefits
Faq
Final note
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