Prettier vs ESLint: Which Should You Use in 2026?

If you’ve set up a modern JavaScript project, you’ve almost certainly hit the Prettier vs ESLint question. Both tools touch your code. Both claim to improve it. And if you configure them wrong, they’ll fight each other every time you save a file.

The good news: once you understand what each tool actually does, the decision becomes obvious. In most projects, you don’t pick one — you use both with a clear division of responsibilities.

What ESLint Actually Does

ESLint is a linter. It analyzes your code statically and flags patterns that are likely bugs, bad practices, or violations of your team’s style guide. ESLint works with rules — you turn them on or off, set them to warn or error, and configure options per rule.

// ESLint will catch this — using a variable before it's declared
console.log(name);
var name = "Alice";

// ESLint will catch this — unreachable code
function greet() {
  return "hello";
  console.log("this never runs");
}

ESLint can also auto-fix some issues, but its primary job is finding problems. It understands your code’s logic and can reason about scope, variable usage, and control flow.

Common ESLint rule categories:

• Possible errors: no-undef, no-unreachable, use-isnan
• Best practices: eqeqeq, no-eval, prefer-const
• Style: camelcase, no-trailing-spaces, semi

The style rules are where things get messy — because Prettier also touches style.

What Prettier Actually Does

Prettier is a code formatter. It takes your code, parses it into an AST (Abstract Syntax Tree), and reprints it according to its own consistent style. Prettier doesn’t analyze logic or flag bugs. It has one job: making your code look consistent.

// Before Prettier
const obj = {name: "Alice",   age: 30,   role: "developer"};

// After Prettier
const obj = {
  name: "Alice",
  age: 30,
  role: "developer",
};

Prettier is opinionated by design. It offers very few configuration options intentionally — the philosophy is that teams waste too much time debating style. Prettier ends those debates by making the decision for you.

What Prettier formats:

• JavaScript, TypeScript, JSX
• CSS, SCSS, Less
• HTML, Vue, Angular templates
• JSON, YAML, Markdown

The Key Difference

ESLint catches bugs and bad patterns. Prettier enforces consistent formatting.

These are genuinely different concerns. ESLint’s style rules are about readability preferences — tabs vs spaces, semicolons, trailing commas. Prettier’s formatting is about making code visually uniform so your brain processes it faster.

The conflict arises because ESLint’s style rules overlap with what Prettier does. If ESLint expects single quotes but Prettier reformats to double quotes, you get a conflict loop on every save.

The Right Setup: Use Both, With Clear Boundaries

The standard approach in 2026 is to use both tools with eslint-config-prettier to disable ESLint’s formatting rules, letting Prettier own that space entirely.

npm install --save-dev eslint prettier eslint-config-prettier

Your .eslintrc or eslint.config.js:

import js from "@eslint/js";
import prettier from "eslint-config-prettier";

export default [
  js.configs.recommended,
  prettier, // disables ESLint formatting rules that conflict with Prettier
  {
    rules: {
      // your custom logic/quality rules here
      "no-unused-vars": "error",
      "prefer-const": "error",
    },
  },
];

Your .prettierrc:

{
  "semi": true,
  "singleQuote": true,
  "tabWidth": 2,
  "trailingComma": "es5"
}

With this setup:

• Prettier runs on save (via editor extension or pre-commit hook) to format code
• ESLint runs to catch actual bugs and anti-patterns
• No conflicts because eslint-config-prettier disables the overlap

When You Might Choose Only One

ESLint only: If you’re maintaining a legacy codebase where Prettier’s reformatting would create massive diffs and confuse git blame. Also valid if you have very specific formatting needs that Prettier doesn’t support.

Prettier only: If you’re on a team that just wants consistent formatting and doesn’t need code quality enforcement. Works fine for smaller projects or scripts.

Neither: Command-line utilities, quick scripts, personal projects where you’re the only contributor. Don’t over-engineer tooling for throwaway code.

Editor Integration

Both tools have excellent VS Code extensions. Install:

• ESLint extension — shows errors inline as you type
• Prettier extension — formats on save

Set Prettier as the default formatter in .vscode/settings.json:

{
  "editor.defaultFormatter": "esbenp.prettier-vscode",
  "editor.formatOnSave": true,
  "editor.codeActionsOnSave": {
    "source.fixAll.eslint": "explicit"
  }
}

This setup formats with Prettier on every save, then applies ESLint auto-fixes for non-formatting rules.

Pre-commit Hooks

For team projects, enforce both tools before code reaches the repo. Use lint-staged with husky:

npm install --save-dev husky lint-staged
npx husky init

In package.json:

{
  "lint-staged": {
    "*.{js,ts,jsx,tsx}": ["prettier --write", "eslint --fix"],
    "*.{css,md,json}": ["prettier --write"]
  }
}

Now every commit is automatically formatted and linted. No more “fix formatting” commits cluttering your history.

Try It: Test Your Regex Patterns

When writing ESLint rules with regex (like id-match or no-restricted-syntax), testing your patterns before adding them to config saves headaches. Use the DevPlaybook Regex Playground to validate your regex patterns against real code samples before committing them to your ESLint config.

The Bottom Line

Use Prettier for formatting, ESLint for quality — always together. The eslint-config-prettier package is the glue that makes them coexist cleanly. Set it up once with your preferred Prettier options and forget about style debates forever.

If you want a production-ready config with ESLint, Prettier, TypeScript, and pre-commit hooks already wired together — the DevToolkit Starter Kit includes a battle-tested setup you can drop into any project in minutes.

👉 Get the DevToolkit Starter Kit on Gumroad