Here are some links to validators that you can use to check your assignment code. We will run all your code through a validator as part of your assignment submission. You should too.

Validators will tell you exactly what you need to know to fix the errors in your code.

HTML, CSS, etc.

W3C Markup Validation Service (HTML)

W3C has a bunch of different validators that can check CSS, web platforms (mobile ready), dead links, RSS, and one that checks all of these things.

Collection of W3C validators


JSONLint - The JSON Validator

JSON Formatter (Best JSON Formatter and Validator)

JSON Formatter and Validator


JSHint, a JavaScript Code Quality Tool

JavaScript Validator - Code Beautify

Online JavaScript Validator - BeautifyTools

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