Have you read the installation documentation ? You must install jshint using Node.js
If you have completed all the steps, see Tools> SublimeLinter> Lint Mode. "Background" should be selected if you want to check the syntax as you type.
You can also try to make some mistakes and press CTRL + K and then A to show all errors. If you see errors that mean jshint is installed and working correctly. If not, you will have a problem with your installation.
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