Which is Better JavaScript Code Quality Tools?
eslint vs prettier vs js-beautify vs standard
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What's JavaScript Code Quality Tools?

JavaScript code quality tools are essential for maintaining clean, consistent, and error-free code in web development. They help developers enforce coding standards, format code, and identify potential issues before deployment. These tools can significantly improve code readability, maintainability, and overall project quality, making them invaluable in collaborative environments. By integrating these tools into the development workflow, teams can ensure that their code adheres to best practices and is easily understandable by others, thereby enhancing collaboration and reducing technical debt.

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eslint47,691,45325,1083.34 MB8419 hours agoMIT
prettier44,001,06649,4327.7 MB1,4124 months agoMIT
js-beautify4,420,4538,633978 kB4059 months agoMIT
standard646,17429,135164 kB1232 months agoMIT
Feature Comparison: eslint vs prettier vs js-beautify vs standard

Configuration Flexibility

  • eslint: ESLint offers extensive configuration options, allowing developers to customize rules, environments, and plugins to fit their specific project needs. This flexibility enables teams to enforce unique coding standards and practices effectively.
  • prettier: Prettier is opinionated and has minimal configuration options, which simplifies the formatting process. It enforces a consistent style across the codebase, reducing the need for discussions about code style preferences.
  • js-beautify: js-beautify is relatively simple and does not require extensive configuration. It focuses primarily on formatting code, making it easy to use without needing to set up complex rules or configurations.
  • standard: Standard is designed to be zero-config, meaning it comes with a predefined set of rules that cannot be changed. This makes it easy to adopt but limits customization.

Integration with Development Tools

  • eslint: ESLint integrates seamlessly with various development tools and IDEs, providing real-time feedback and suggestions as you code. This integration helps catch issues early in the development process, improving code quality.
  • prettier: Prettier integrates well with most IDEs and editors, allowing for automatic formatting on save. This feature ensures that code is consistently styled without manual intervention, streamlining the development workflow.
  • js-beautify: js-beautify can be integrated into build processes or used as a standalone tool, but it lacks the real-time linting capabilities of ESLint. It is primarily used for formatting code rather than ongoing analysis.
  • standard: Standard can be integrated into CI/CD pipelines to enforce code style checks automatically. However, it does not provide real-time feedback like ESLint.

Community and Ecosystem

  • eslint: ESLint has a large and active community, with numerous plugins and extensions available to enhance its functionality. This ecosystem allows developers to tailor ESLint to their specific needs and leverage community-contributed rules.
  • prettier: Prettier has gained significant popularity and has a strong community backing. It supports various languages and frameworks, and its opinionated nature has led to widespread adoption in many projects.
  • js-beautify: js-beautify has a smaller community compared to ESLint and Prettier, resulting in fewer plugins or extensions. It is primarily focused on formatting rather than linting, which limits its ecosystem.
  • standard: Standard has a dedicated community that promotes its use for JavaScript projects. However, its zero-config approach may limit the number of extensions or plugins available.

Learning Curve

  • eslint: ESLint has a moderate learning curve due to its extensive configuration options and rule sets. New users may need time to understand how to set up and customize their linting rules effectively.
  • prettier: Prettier is designed to be easy to use, with minimal configuration required. Developers can quickly adopt it without needing to understand complex options, making it beginner-friendly.
  • js-beautify: js-beautify is straightforward and easy to use, making it accessible for beginners who need a simple tool for formatting code without complex configurations.
  • standard: Standard's zero-config approach makes it easy to get started, as there is no need to configure rules. However, users may need to familiarize themselves with its predefined rules.

Performance

  • eslint: ESLint can be resource-intensive, especially with large codebases and numerous rules. However, it provides options to optimize performance, such as limiting the scope of linting or using caching.
  • prettier: Prettier is optimized for performance and can format large files quickly. Its focus on speed ensures that formatting does not significantly slow down the development process.
  • js-beautify: js-beautify performs well for formatting tasks, but it may not be as efficient for large files or complex codebases compared to dedicated linters.
  • standard: Standard's performance is generally good, but it may vary depending on the complexity of the codebase and the number of rules being enforced.
How to Choose: eslint vs prettier vs js-beautify vs standard
  • eslint: Choose ESLint if you need a highly configurable linter that allows you to enforce coding standards and catch errors in your JavaScript code. It supports a wide range of plugins and rules, making it suitable for various coding styles and frameworks.
  • prettier: Opt for Prettier if you want an opinionated code formatter that enforces a consistent style across your codebase. It automatically formats code on save, reducing debates over code style and allowing developers to focus on writing code rather than formatting it.
  • js-beautify: Select js-beautify if your primary need is to format JavaScript, HTML, or CSS code to improve readability. It is straightforward and focuses on beautifying code without enforcing strict linting rules, making it ideal for quick formatting tasks.
  • standard: Choose Standard if you prefer a zero-configuration approach to code style enforcement. It provides a set of rules that are widely accepted in the JavaScript community, making it easy to adopt without extensive setup.
Similar Npm Packages to eslint

eslint is a widely used linting utility for JavaScript and JSX code. It helps developers identify and fix problems in their code by enforcing a consistent coding style and catching potential errors before they become issues. ESLint is highly configurable, allowing developers to define their own rules or use predefined configurations to suit their project's needs. While ESLint is an excellent tool for maintaining code quality, there are other alternatives that serve similar purposes. Here are a few notable alternatives:

  • prettier is an opinionated code formatter that focuses on maintaining a consistent style across your codebase. Unlike ESLint, which primarily focuses on identifying and fixing code quality issues, Prettier automatically formats your code according to a set of rules. It can be used alongside ESLint to ensure both code quality and consistent formatting, making it a popular choice among developers who want to streamline their development workflow.
  • stylelint is a modern linter specifically designed for CSS and other style-related files. It helps developers maintain consistent styles and catch errors in their stylesheets. If your project involves a significant amount of CSS or preprocessors like SCSS or LESS, using Stylelint in conjunction with ESLint can help ensure that both your JavaScript and styles are well-structured and error-free.
  • tslint was a linter specifically designed for TypeScript code. However, it has been deprecated in favor of ESLint, which now supports TypeScript through the use of plugins. If you are working on a TypeScript project, you can leverage ESLint's capabilities to lint your TypeScript code effectively, making TSLint less relevant in modern development.

For a comprehensive comparison of these packages, visit: Comparing eslint vs prettier vs stylelint vs tslint.

Similar Npm Packages to prettier

prettier is an opinionated code formatter that helps developers maintain consistent code style across their projects. It automatically formats code according to predefined rules, making it easier to read and reducing the likelihood of style-related issues. While prettier is widely used for code formatting, there are several alternatives that also serve similar purposes. Here are a few notable ones:

  • eslint is primarily a linting tool for JavaScript and JSX code, but it also offers formatting capabilities. With a wide range of rules and plugins, ESLint helps developers identify and fix problems in their code, ensuring adherence to coding standards. While ESLint focuses on code quality and potential errors, it can be configured to format code as well, making it a versatile tool for maintaining code style and quality.
  • js-beautify is a simple and flexible JavaScript code beautifier that can format HTML, CSS, and JavaScript code. It allows developers to customize formatting options according to their preferences. While js-beautify is a straightforward tool for beautifying code, it may not offer the same level of integration and automation as prettier, making it more suitable for quick formatting tasks rather than comprehensive code style enforcement.
  • standard is a JavaScript style guide, linter, and formatter that enforces a specific coding style without the need for configuration. It promotes a set of rules that developers can follow to ensure consistency across their codebases. Standard is particularly appealing for teams that want to adopt a uniform coding style without spending time on configuration, but it may not offer the same flexibility as prettier in terms of customization.

To see how prettier compares with eslint, js-beautify, and standard, check out the comparison: Comparing eslint vs js-beautify vs prettier vs standard.

Similar Npm Packages to js-beautify

js-beautify is a popular library used for formatting and beautifying JavaScript, HTML, and CSS code. It helps developers maintain clean and readable code by automatically adjusting indentation, line breaks, and other formatting aspects according to specified rules. This tool is particularly useful for projects where code consistency is crucial, making it easier for teams to collaborate and maintain code quality over time. With its customizable options, js-beautify allows developers to tailor the formatting to fit their specific coding styles and preferences.

An alternative to js-beautify is prettier, a widely adopted code formatter that focuses on ensuring a consistent style across various programming languages, including JavaScript, TypeScript, HTML, CSS, and more. Prettier takes a different approach by enforcing a set of rules that result in a uniform code style, reducing the need for configuration. It automatically formats code on save, making it an excellent choice for developers who want to streamline their workflow and ensure that their code adheres to a consistent style without manual intervention.

For a detailed comparison between js-beautify and prettier, check out this link: Comparing js-beautify vs prettier.

Similar Npm Packages to standard

standard is a JavaScript style guide, linter, and formatter that enforces a consistent coding style across your codebase without the need for configuration. It aims to provide a zero-configuration experience, allowing developers to focus on writing code rather than worrying about formatting issues. While standard is a popular choice for maintaining code quality, there are several alternatives available that cater to different needs and preferences. Here are a few notable options:

  • eslint is a highly configurable linter for JavaScript and JSX, allowing developers to enforce coding standards and identify problematic patterns in their code. Unlike standard, which is opinionated and requires no configuration, ESLint offers extensive customization options, enabling teams to define their own rules and styles. ESLint is widely used in the JavaScript community and integrates well with various development tools and editors, making it a versatile choice for projects of all sizes.
  • prettier is an opinionated code formatter that focuses solely on code style, ensuring that all code is formatted consistently. While it does not perform linting like ESLint, it can be used in conjunction with ESLint to provide a comprehensive solution for both formatting and linting. Prettier's primary goal is to eliminate debates over code style by enforcing a specific style automatically, making it a popular choice for teams looking for a straightforward formatting solution.
  • semistandard is a JavaScript style guide that builds upon standard by allowing the use of semicolons. It provides a similar zero-configuration experience while giving developers the flexibility to choose whether to use semicolons in their code. Semistandard is ideal for those who appreciate the simplicity of standard but prefer to include semicolons for clarity and consistency in their code.
  • xo is another opinionated linter that aims to provide a great developer experience with a focus on modern JavaScript features. It comes with a set of predefined rules and supports both JavaScript and TypeScript. XO also emphasizes a zero-configuration approach, allowing developers to get started quickly while still providing options for customization if needed.

To explore how these packages compare, check out the comparison: Comparing eslint vs prettier vs semistandard vs standard vs xo.

README for eslint

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ESLint

Website | Configure ESLint | Rules | Contribute to ESLint | Report Bugs | Code of Conduct | Twitter | Discord | Mastodon

ESLint is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code. In many ways, it is similar to JSLint and JSHint with a few exceptions:

  • ESLint uses Espree for JavaScript parsing.
  • ESLint uses an AST to evaluate patterns in code.
  • ESLint is completely pluggable, every single rule is a plugin and you can add more at runtime.

Table of Contents

  1. Installation and Usage
  2. Configuration
  3. Version Support
  4. Code of Conduct
  5. Filing Issues
  6. Frequently Asked Questions
  7. Releases
  8. Security Policy
  9. Semantic Versioning Policy
  10. Stylistic Rule Updates
  11. License
  12. Team
  13. Sponsors
  14. Technology Sponsors

Installation and Usage

Prerequisites: Node.js (^18.18.0, ^20.9.0, or >=21.1.0) built with SSL support. (If you are using an official Node.js distribution, SSL is always built in.)

You can install and configure ESLint using this command:

npm init @eslint/config@latest

After that, you can run ESLint on any file or directory like this:

npx eslint yourfile.js

Configuration

You can configure rules in your eslint.config.js files as in this example:

export default [
    {
        files: ["**/*.js", "**/*.cjs", "**/*.mjs"],
        rules: {
            "prefer-const": "warn",
            "no-constant-binary-expression": "error"
        }
    }
];

The names "prefer-const" and "no-constant-binary-expression" are the names of rules in ESLint. The first value is the error level of the rule and can be one of these values:

  • "off" or 0 - turn the rule off
  • "warn" or 1 - turn the rule on as a warning (doesn't affect exit code)
  • "error" or 2 - turn the rule on as an error (exit code will be 1)

The three error levels allow you fine-grained control over how ESLint applies rules (for more configuration options and details, see the configuration docs).

Version Support

The ESLint team provides ongoing support for the current version and six months of limited support for the previous version. Limited support includes critical bug fixes, security issues, and compatibility issues only.

ESLint offers commercial support for both current and previous versions through our partners, Tidelift and HeroDevs.

See Version Support for more details.

Code of Conduct

ESLint adheres to the OpenJS Foundation Code of Conduct.

Filing Issues

Before filing an issue, please be sure to read the guidelines for what you're reporting:

Frequently Asked Questions

Does ESLint support JSX?

Yes, ESLint natively supports parsing JSX syntax (this must be enabled in configuration). Please note that supporting JSX syntax is not the same as supporting React. React applies specific semantics to JSX syntax that ESLint doesn't recognize. We recommend using eslint-plugin-react if you are using React and want React semantics.

Does Prettier replace ESLint?

No, ESLint and Prettier have different jobs: ESLint is a linter (looking for problematic patterns) and Prettier is a code formatter. Using both tools is common, refer to Prettier's documentation to learn how to configure them to work well with each other.

What ECMAScript versions does ESLint support?

ESLint has full support for ECMAScript 3, 5, and every year from 2015 up until the most recent stage 4 specification (the default). You can set your desired ECMAScript syntax and other settings (like global variables) through configuration.

What about experimental features?

ESLint's parser only officially supports the latest final ECMAScript standard. We will make changes to core rules in order to avoid crashes on stage 3 ECMAScript syntax proposals (as long as they are implemented using the correct experimental ESTree syntax). We may make changes to core rules to better work with language extensions (such as JSX, Flow, and TypeScript) on a case-by-case basis.

In other cases (including if rules need to warn on more or fewer cases due to new syntax, rather than just not crashing), we recommend you use other parsers and/or rule plugins. If you are using Babel, you can use @babel/eslint-parser and @babel/eslint-plugin to use any option available in Babel.

Once a language feature has been adopted into the ECMAScript standard (stage 4 according to the TC39 process), we will accept issues and pull requests related to the new feature, subject to our contributing guidelines. Until then, please use the appropriate parser and plugin(s) for your experimental feature.

Which Node.js versions does ESLint support?

ESLint updates the supported Node.js versions with each major release of ESLint. At that time, ESLint's supported Node.js versions are updated to be:

  1. The most recent maintenance release of Node.js
  2. The lowest minor version of the Node.js LTS release that includes the features the ESLint team wants to use.
  3. The Node.js Current release

ESLint is also expected to work with Node.js versions released after the Node.js Current release.

Refer to the Quick Start Guide for the officially supported Node.js versions for a given ESLint release.

Where to ask for help?

Open a discussion or stop by our Discord server.

Why doesn't ESLint lock dependency versions?

Lock files like package-lock.json are helpful for deployed applications. They ensure that dependencies are consistent between environments and across deployments.

Packages like eslint that get published to the npm registry do not include lock files. npm install eslint as a user will respect version constraints in ESLint's package.json. ESLint and its dependencies will be included in the user's lock file if one exists, but ESLint's own lock file would not be used.

We intentionally don't lock dependency versions so that we have the latest compatible dependency versions in development and CI that our users get when installing ESLint in a project.

The Twilio blog has a deeper dive to learn more.

Releases

We have scheduled releases every two weeks on Friday or Saturday. You can follow a release issue for updates about the scheduling of any particular release.

Security Policy

ESLint takes security seriously. We work hard to ensure that ESLint is safe for everyone and that security issues are addressed quickly and responsibly. Read the full security policy.

Semantic Versioning Policy

ESLint follows semantic versioning. However, due to the nature of ESLint as a code quality tool, it's not always clear when a minor or major version bump occurs. To help clarify this for everyone, we've defined the following semantic versioning policy for ESLint:

  • Patch release (intended to not break your lint build)
    • A bug fix in a rule that results in ESLint reporting fewer linting errors.
    • A bug fix to the CLI or core (including formatters).
    • Improvements to documentation.
    • Non-user-facing changes such as refactoring code, adding, deleting, or modifying tests, and increasing test coverage.
    • Re-releasing after a failed release (i.e., publishing a release that doesn't work for anyone).
  • Minor release (might break your lint build)
    • A bug fix in a rule that results in ESLint reporting more linting errors.
    • A new rule is created.
    • A new option to an existing rule that does not result in ESLint reporting more linting errors by default.
    • A new addition to an existing rule to support a newly-added language feature (within the last 12 months) that will result in ESLint reporting more linting errors by default.
    • An existing rule is deprecated.
    • A new CLI capability is created.
    • New capabilities to the public API are added (new classes, new methods, new arguments to existing methods, etc.).
    • A new formatter is created.
    • eslint:recommended is updated and will result in strictly fewer linting errors (e.g., rule removals).
  • Major release (likely to break your lint build)
    • eslint:recommended is updated and may result in new linting errors (e.g., rule additions, most rule option updates).
    • A new option to an existing rule that results in ESLint reporting more linting errors by default.
    • An existing formatter is removed.
    • Part of the public API is removed or changed in an incompatible way. The public API includes:
      • Rule schemas
      • Configuration schema
      • Command-line options
      • Node.js API
      • Rule, formatter, parser, plugin APIs

According to our policy, any minor update may report more linting errors than the previous release (ex: from a bug fix). As such, we recommend using the tilde (~) in package.json e.g. "eslint": "~3.1.0" to guarantee the results of your builds.

Stylistic Rule Updates

Stylistic rules are frozen according to our policy on how we evaluate new rules and rule changes. This means:

  • Bug fixes: We will still fix bugs in stylistic rules.
  • New ECMAScript features: We will also make sure stylistic rules are compatible with new ECMAScript features.
  • New options: We will not add any new options to stylistic rules unless an option is the only way to fix a bug or support a newly-added ECMAScript feature.

License

FOSSA Status

Team

These folks keep the project moving and are resources for help.

Technical Steering Committee (TSC)

The people who manage releases, review feature requests, and meet regularly to ensure ESLint is properly maintained.

Nicholas C. Zakas's Avatar
Nicholas C. Zakas 		Francesco Trotta's Avatar
Francesco Trotta 		Milos Djermanovic's Avatar
Milos Djermanovic

Reviewers

The people who review and implement new features.

唯然's Avatar
唯然 		Nitin Kumar's Avatar
Nitin Kumar

Committers

The people who review and fix bugs and help triage issues.

Josh Goldberg ✨'s Avatar
Josh Goldberg ✨ 		Tanuj Kanti's Avatar
Tanuj Kanti

Website Team

Team members who focus specifically on eslint.org

Amaresh S M's Avatar
Amaresh S M 		Strek's Avatar
Strek 		Percy Ma's Avatar
Percy Ma

Sponsors

The following companies, organizations, and individuals support ESLint's ongoing maintenance and development. Become a Sponsor to get your logo on our READMEs and website.

Platinum Sponsors

Automattic Airbnb

Gold Sponsors

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Silver Sponsors

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Bronze Sponsors

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Technology Sponsors

Technology sponsors allow us to use their products and services for free as part of a contribution to the open source ecosystem and our work.

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