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Wes Bos

Wes Bos

XL5G3 Full Stack JavaScript Developer. Creator of really good web development courses. BBQ enthusiast.

Scott Tolinski

Scott Tolinski

Web Developer, NX2V1, Creator of Level Up Tuts, Bboy, Robotops Crew and Youtuber

Playing: 047: How to Get Better at Debugging



May 23rd, 2018

How to Get Better at Debugging

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Scott and Wes detail the tips and tools you need to get better at debugging.

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Show Notes


  • Read the stack trace


  • Make sure you aren't debugging production
  • Make sure you're not cached


  • Check the network panel for the whole response
  • CORS (Cross-Origin Resource Sharing)


  • Use debugger commands in the browser
  • Set breakpoints (race conditions)


  • Use Source Maps


  • Make full use of all console methods
    • console.group/groupEnd/info/
    • console.log({objNAme})


  • View your code in other browers
  • Make sure your browser is up to date


  • Step into and step over function
  • Useful for especially tricky issues


  • Look into Scope in dev tools panel


  • Recreate it in CodePen or Create React App
    • Helps to quarantine your code
    • Verify where the problem actually is


  • Take a break
    • Helps clear your head and approach your problem from a different angle


  • Rubber Duck Debugging
    • Forcing yourself to talk it out will often reveal problems/issues


  • Check Github issues / ask in Slack
    • Leave your solution in the comments for others


  • Use Node --inspect flag


  • Read the code in your libs (if you can)

32:34 - Chrome Dev Tools Tabs Rundown

  • 33:10 - Network tab
  • 34:15 - Preformance tab
  • 35:58 - Lesser known tools
    • 36:15 - Firefox Grid Debug
    • 36:20 - Firefox Fonts tab
    • 37:10 - More tools (three dots menu in top right of Chrome Dev Tools window)
    • 37:39 - Chrome Animations Inspector
    • 38:34 - /dev tips & Modern DevTools Course
    • 39:41 - Chrome & FF Layers for 3d and full view of canvas & window
    • 40:51 - Sensors for overriding fake devices sensors
      • Hot tip: Use Instagram on the desktop - Go to Instagram and set the user agent to iPad and it will work as it does on that actual device
      • Hot tip: Get free internet on a plane ;) - If the airplane offers free internet for a certain device, change your user agent to that device and then switch back
    • 43:12 - Favorite DevTools extensions
  • 44:06 - Application/Storage tab
  • 44:41 - FireFox Grid Inspector


  • Scott: Hotel Tonight App
  • Wes: Coffee table - If you're trying to build an outdoor coffee table, use a piece of granite

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