Linting in React

Recently I started experimenting with the idea of code linting via ESLint and Prettier. I recently wrote another article on this subject concerning this Nuxtjs Blog - Webstorm and Nuxtjs Linting. So, enter the story of three tools:

TLTR: Go to the repository.


To get started create a React App: yarn create react-app react-linting or npx create-react-app react-linting. Create React App comes pre-configured with some of the necessary ESLint packages and we need to extend that default configuration. So, we need to install a few additional packages as devDependencies: yarn add -D eslint-config-prettier eslint-plugin-prettier prettier or npm install --save-dev eslint-config-prettier eslint-plugin-prettier prettier. These packages will set up the additional linting we require. Since, React uses the package.jsonfor ESLint configuration, so will I, but you could just as easily is a separate configuration file. Add the prettier plugin to the eslingConfigsection of the package.json file:

"eslintConfig": {
"extends": [

Instead of a .prettierrc configuration file we will add a new section to the package.jsonfile. This section is my configuration but you can change as you desire:

"prettier": {
"printWidth": 90,
"bracketSpacing": true,
"trailingComma": "es5",
"semi": false,
"singleQuote": true

To make these tools more usable, we can add the following to the script section of our package.jsonfile:

"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"lint:fix": "eslint src/**/*.js --fix",
"lint": "eslint src/**/*.js",
"prettify": "prettier src/**/*.js --write"

We could stop here, but we are going to automate these task. You need to install two more packages: yarn add -D husky lint-staged or npm install --save-dev husky lint-staged. We need to add the following tweo short sections to the package.json file:

"husky": {
"hooks": {
"pre-commit": "lint-staged"
"lint-staged": {
"*.js": "npm run lint:fix"

So now the magic begins. Based on our prettier configuration, change something in a javascriptfile: add a semi-colon or change from single to double quotes. When you commit a change, husky will run lint-stagedand fix your files automagically. This is just a very basic setup but you get the idea.

Happy coding.