Code Linters and Formatters for Web Developers

Warning: This list is no longer maintained, and some links may no longer work.

Official online version of popular projects that improve your JavaScript code

Prettier (formatter)

https://prettier.io/playground/

ESLint (linter)

https://eslint.org/demo

JSHint (linter)

http://jshint.com/

Tools for other languages

CSS

• http://www.codebeautifier.com/

HTML

• http://htmlformatter.com/

JSON

• https://jsonformatter.curiousconcept.com/
• https://jsonformatter.org/

GraphQL

• http://toolbox.sangria-graphql.org/format

General purpose (handle more than 1 single syntax)

• https://ctrlq.org/beautifier/

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