Prettier — Complete Guide
Prettier — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of JavaScript Tutorial on Toolliyo Academy.
On this page
JavaScript Tutorial · Lesson 88 of 100
Prettier
Basics ✓ → Objects & data ✓ → Async & DOM ✓ → Advanced ✓ → Tools → Projects
Advanced · 5 — Testing & tools · ~10 min · JS Testing & Tooling
What is this?
Prettier auto-formats code — quotes, semicolons, line width — so teams stop arguing about style.
Why should you care?
One command formats the whole project the same way.
See it live — copy this example
Paste into an HTML file or the browser console (F12). Use Run below when the live editor is available.
// package.json script: "format": "prettier --write ."
// Runs on save with VS Code Prettier extensionRun Example »
Edit the code below and click Run to see the result in Toolliyo’s live editor.
What happened?
- Prettier is opinionated — few options.
- Run after ESLint or use eslint-config-prettier to avoid conflicts.
Practice next
- Add format script with prettier --write .
- Enable format on save in editor.
- Add .prettierrc if team needs single quotes.
- Set printWidth to 100 and format one long file.
- Add prettier ignore for generated bundle output.
Remember
Automatic formatting Works with ESLint Format on save
ScriptVerse code review
Prettier eliminates "fix indentation" review comments so reviewers focus on logic.
Outcome: Consistent formatting speeds merges across distributed ScriptVerse teams.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
Sign in to ask a question or upvote helpful answers.
No questions yet — be the first to ask!
