Code Linters and Formatters for Web Developers

There are many online tools that help you lint or format code. This post list many of the most useful ones for HTML, CSS and JavaScript

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/