Code validators

Hi all, anyone know of a program that is free or at least fairly cheap, whereby you paste a chunk of code into it, and it tells you where any problems are please? Preferably for all types of codes, but at least HTML.

There is the W3C on-line Validation tool.

There are lots of options. There are online tools like the HTML/CSS validators, and there are similar JS validators like jslint.

Or you could download a free code editor like Atom and install debugging add-ons for the various languages you are working on—all free.

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