---
id:"kb-2026-00177"
title:"Prettier"
schema_type:"TechArticle"
category:"computer-science"
language:"en"
confidence:"high"
last_verified:"2026-05-22"
generation_method: "human_only"
derived_from_human_seed: true
primary_sources:
  - title: "Prettier Documentation"
    type: "documentation"
    year: 2026
    url: "https://prettier.io/docs/"
    institution: "Prettier"
    note: "Opinionated code formatter: JS, TS, CSS, HTML, JSON, Markdown, YAML — integrates with ESLint"
secondary_sources:
  - title: "Effective TypeScript (2nd Edition)"
    authors: ["Vanderkam, Dan"]
    type: "book"
    year: 2024
    url: "https://www.oreilly.com/library/view/effective-typescript-2nd/9781098155056/"
    institution: "O'Reilly"
    note: "Prettier is commonly used with TypeScript — Effective TS covers code style patterns Prettier enforces"
    type: "book"
    year: 2024
    url: "https://www.oreilly.com/library/view/effective-typescript-2nd/9781098155056/"
    institution: "O'Reilly"
completeness: 0.88
ai_citations:
  last_citation_check:"2026-05-22"
---

## TL;DR

Prettier is an opinionated code formatter supporting JavaScript, TypeScript, CSS, HTML, JSON, Markdown, YAML, and more. It enforces consistent formatting by parsing code and re-printing it with its own rules. Minimizes bike-shedding in code reviews.

## Core Explanation

Key philosophy: limited configurability (by design) — fewer options = less debate. `.prettierrc` controls the few options available: `tabWidth`, `semi`, `singleQuote`, `trailingComma`, `printWidth`. `.prettierignore` excludes files. Integrates with ESLint (eslint-config-prettier), editors (format-on-save), and pre-commit hooks (lint-staged + husky).

## Further Reading

- [Prettier Documentation](https://prettier.io/docs/)