Prettier
Opinionated code formatter for JavaScript, TypeScript, CSS, HTML, JSON, Markdown, and 10+ languages. Prettier parses code into an AST and re-prints it with its own rules — eliminating all style debates. Integrates with ESLint (via eslint-config-prettier), editors (VSCode, IntelliJ), and git hooks (husky/lint-staged) for automatic formatting on save or commit.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Local formatting tool. No external calls. Formatting changes whitespace only — no security concerns. Ensure .prettierignore includes any files with embedded secrets or sensitive patterns.
⚡ Reliability
Best When
Any JavaScript/TypeScript project that wants to eliminate formatting debates and ensure consistent code style across the team automatically.
Avoid When
You need highly custom formatting rules or use Biome (which replaces Prettier with a faster Rust implementation).
Use Cases
- • Automatically format all JavaScript/TypeScript code in agent repositories on git commit using lint-staged + husky for consistent style
- • Integrate Prettier into VSCode (format on save) so agent developers never manually format code
- • Format JSON config files, Markdown documentation, and CSS/SCSS alongside code in one consistent tool
- • Eliminate code style discussions in code review by enforcing a single Prettier config — style is automated, not debated
- • Run Prettier in CI with --check flag to fail builds when code is not formatted — enforces formatting without blocking developer workflow
Not For
- • Code quality enforcement — Prettier only formats, it doesn't catch bugs or enforce patterns; use ESLint for quality rules
- • Highly customized formatting requirements — Prettier's intentional inflexibility means limited configuration; accept its style or don't use it
- • Languages beyond its supported set — Prettier doesn't format Ruby, Python, Go, Rust natively; use language-specific formatters
Interface
Authentication
No authentication — local formatting tool.
Pricing
Prettier is open source and free.
Agent Metadata
Known Gotchas
- ⚠ Prettier 3.x requires Node.js 14+ and breaks some plugins from Prettier 2 — check plugin compatibility before upgrading (eslint-plugin-prettier, prettier-plugin-tailwindcss)
- ⚠ Prettier ignores .prettierrc options that conflict with its opinionated defaults — some formatting cannot be changed; accept or reject the tool entirely
- ⚠ ESLint and Prettier conflict without eslint-config-prettier — some ESLint style rules contradict Prettier; install eslint-config-prettier to disable conflicting rules
- ⚠ Prettier 3 changed async plugin architecture — plugins using the synchronous API from Prettier 2 break silently with 3.x; update plugins explicitly
- ⚠ Prettier reformats entire files even when only one line changed — this makes git blame less useful; add --write with staged-only checks to minimize reformatting scope
- ⚠ HTML formatting by Prettier changes whitespace in ways that affect rendered output — test HTML formatting changes carefully, especially for inline elements
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-07.