Jani Hartikainen Tutorials

    Jani Hartikainen has spent over 10 years building web applications. His clients include companies like Nokia and hot super secret startups. When not programming or playing games, Jani writes about JavaScript and high quality code on his site.

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    Detect Problems in JavaScript Automatically with ESLint

    When writing JavaScript, I spend a lot of time fixing basic mistakes. I often rename a variable and test my app, and then find I didn’t rename the variable in one spot. I rename functions, same thing. I type things wrong, and again waste time clicking...

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    JavaScript Errors and How to Fix Them

    JavaScript can be a nightmare to debug: Some errors it gives can be very difficult to understand at first, and the line numbers given aren’t always helpful either. Wouldn’t it be useful to have a list where you could look to find out what they mean...