ESLint vs. Prettier vs. Biome: The Ultimate Code Linting and Formatting Showdown

If you’ve written JavaScript in the last five years, you’ve almost certainly had a moment where your editor turned a sea of red squiggles into a manageable list of fixes. That moment is courtesy of linters and formatters—tools that have quietly become as essential as the compiler itself. But the ecosystem is shifting. Biome, a relative newcomer written in Rust, is challenging the long-standing duo of ESLint and Prettier. Which one should you actually use in 2024?

The answer isn’t as simple as “pick the fastest.” It depends on your team’s workflow, your project’s age, and how much configuration pain you’re willing to tolerate. Let’s break down the strengths, weaknesses, and ideal use cases for each tool.

The Contenders: A Quick Overview

Before diving into the nitty-gritty, here’s what each tool brings to the table:

  • ESLint: The industry-standard linter. It analyzes your code for problematic patterns, enforces style rules, and can auto-fix many issues. It’s been around since 2013 and has a massive plugin ecosystem.
  • Prettier: The opinionated formatter. It doesn’t care about logic errors—it only cares about how your code looks. It parses your code and reprints it with a consistent style, eliminating debates about semicolons and quotes.
  • Biome: The all-in-one challenger. Written in Rust, it combines linting and formatting in a single binary. It’s designed to be a drop-in replacement for both ESLint and Prettier, with a focus on speed and simplicity.

The core question is whether you stick with the battle-tested pair or consolidate everything into one fast tool.

ESLint: The Mature Powerhouse

ESLint is not just a tool; it’s an ecosystem. With over 10,000 available plugins, it can lint everything from React hooks to Tailwind CSS class order. Its configurability is both its greatest strength and its biggest weakness.

Why Teams Still Choose ESLint

The plugin ecosystem is the primary reason ESLint remains dominant. Need to enforce a specific rule from a company style guide? There’s likely a plugin for it. Working with TypeScript? @typescript-eslint provides type-aware linting that can catch bugs like await on a non-Promise value. This depth is something no other tool has matched yet.

ESLint also integrates seamlessly with most build tools and CI pipelines. If your team has been using it for years, you likely have a highly tuned .eslintrc file that encodes hundreds of decisions about code style and correctness. Recreating that in a new tool is a non-trivial task.

The Pain Points

The biggest complaint about ESLint is speed. On a large monorepo, running ESLint can take tens of seconds. The Node.js-based architecture simply can’t compete with native code. Additionally, the configuration system has historically been confusing. The shift from .eslintrc to the new flat config format (eslint.config.js) has caused friction, even though it’s a long-term improvement.

Another issue is scope. ESLint is a linter, not a formatter. To get consistent formatting, you need Prettier (or eslint-plugin-prettier). This means two tools, two config files, and occasional conflicts between what ESLint wants and what Prettier enforces.

Best for: Large, established projects with complex custom rules, heavy plugin usage, or strict corporate style guides.

Prettier: The Great Unifier

Prettier’s philosophy is simple: “An opinionated code formatter.” It takes your code, discards its original formatting, and reprints it from scratch. This ends debates about tabs vs. spaces permanently—because the output is always the same.

Why Prettier Won

Prettier solved a social problem as much as a technical one. Before Prettier, teams spent hours in code reviews arguing about whether a line should be wrapped at 80 characters or 100. Prettier made those discussions irrelevant. You set it up once, and the output is deterministic.

It also handles a wide range of languages out of the box: JavaScript, TypeScript, CSS, HTML, JSON, Markdown, YAML, and more. This makes it a universal formatting tool, not just a JavaScript one.

The Trade-Offs

The main criticism of Prettier is its lack of options. You can’t configure it to use single quotes for imports but double quotes for strings. You can’t adjust how it wraps function arguments beyond a few preset options. This is intentional—more options lead to more debates—but it can frustrate teams that want a specific style.

Performance is also a consideration. While Prettier is fast, it’s not instant on large files. And because it’s a separate tool from ESLint, you end up running two processes in your editor and CI, which adds overhead.

Best for: Teams that prioritize consistency over customization, and projects that need multi-language formatting support.

Biome: The Speed-First Contender

Biome (formerly known as Rome) is the ambitious project that aims to kill two birds with one stone. Written in Rust, it claims to be 10x faster than ESLint and Prettier. It offers both linting and formatting in a single CLI tool with zero dependencies.

The Performance Advantage

Speed is the headline feature. On a typical codebase, Biome formats and lints in milliseconds. This makes it feasible to run on every file save, giving you instant feedback without waiting for a separate process. For large monorepos, this can be a game-changer for developer experience.

Biome also simplifies your toolchain. One binary, one config file (biome.json), and no need to coordinate between a linter and a formatter. It’s designed to be a drop-in replacement, with a compatibility layer that can parse most ESLint and Prettier configs.

The Current Limitations

The biggest hurdle is the plugin ecosystem. Biome has a growing set of built-in rules (over 200), but it’s nowhere near ESLint’s 10,000+ plugins. If you rely on a niche plugin or a highly specific rule, Biome might not support it yet.

Biome also supports fewer languages than Prettier. It currently handles JavaScript, TypeScript, JSX, and JSON well, but CSS and HTML support is still evolving. For projects that need heavy multi-language formatting, this could be a dealbreaker.

Finally, there’s the migration cost. Even though Biome can parse existing configs, the translation isn’t perfect. You’ll likely need to manually adjust some rules, and your team will need to learn a new tool. For some, the speed gain is worth it; for others, it’s a disruption without immediate benefit.

Best for: New projects, performance-sensitive teams, and developers who want a single tool that handles both linting and formatting.

Head-to-Head Comparison

Let’s put them side by side across the criteria that matter most.

Speed

  • Biome: Wins decisively. Its Rust-based engine is orders of magnitude faster than Node-based tools.
  • ESLint: Slowest of the three, especially with type-aware rules enabled.
  • Prettier: Faster than ESLint but still slower than Biome on large files.

Configuration

  • ESLint: Extremely flexible but complex. The flat config system is better but still has a learning curve.
  • Prettier: Minimal options, which is a feature for many. You can count the config options on one hand.
  • Biome: Simple and intuitive. The biome.json file is easy to read and modify.

Extensibility

  • ESLint: Unmatched. If a rule exists, ESLint can enforce it.
  • Prettier: Not extensible by design. It does one thing and does it well.
  • Biome: Growing, but still limited compared to ESLint.

Language Support

  • ESLint: JavaScript and TypeScript primarily, with community plugins for others.
  • Prettier: Broadest support, including CSS, HTML, Markdown, and YAML.
  • Biome: Solid for JS/TS/JSX/JSON, but weaker for other languages.

Ecosystem and Community

  • ESLint: Massive. Years of blog posts, Stack Overflow answers, and IDE integrations.
  • Prettier: Also massive, with deep integration into every major editor.
  • Biome: Growing quickly, but the community is still small by comparison.

The Hybrid Approach: Using Them Together

You don’t have to choose just one. A common pattern is to use Biome for formatting and ESLint for linting, or vice versa. Biome can even be configured to ignore formatting and focus on linting, letting Prettier handle style.

For example, a team could use Biome as a fast pre-commit hook to catch obvious issues, while still running ESLint with type-aware rules in CI for deeper analysis. This gives you the speed of Biome without sacrificing ESLint’s depth.

However, this adds complexity. You now have two tools to maintain, and you need to ensure their rules don’t conflict. The “one tool to rule them all” promise of Biome is appealing precisely because it eliminates this overhead.

The Verdict: What Should You Choose?

There’s no universal winner—it depends on your context.

  • Choose ESLint if: You’re working on a large, mature codebase with extensive custom rules or a heavy reliance on plugins. The migration cost to Biome is likely too high, and the ecosystem depth is irreplaceable.
  • Choose Prettier if: You want zero-config formatting across multiple languages and don’t need complex linting rules. It’s the safest, most predictable choice.
  • Choose Biome if: You’re starting a new project, value speed above all else, or want to simplify your toolchain. It’s also a great choice for monorepos where linting speed is a bottleneck.

The smartest approach might be to keep an eye on Biome’s development. It’s improving rapidly, and its compatibility layer makes it easier to switch over time. For now, the pragmatic choice is often a hybrid: use ESLint for deep analysis, Prettier for formatting, and consider Biome as a faster alternative for your pre-commit hooks.

The ultimate showdown isn’t about which tool is “best”—it’s about which tool fits your workflow without getting in the way. That’s a metric no benchmark can measure.