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Debugging & Troubleshooting

  • Copy and paste the error into Google.

Build Errors​

  • Ensure that you have the correct dependencies in your package.json and run a npm install

Exercises​

Debugging​

Express Application​

  • Use VS Code's Debug tools VS Code Debug
  • Select the node file you want to run. ie. index.js
  • Add a configuration for the application, by clicking the dropdown next to the play Debug and select Add Configuration and select Node
  • It should autofill with the details of the project and look like the following:
    {
      // Use IntelliSense to learn about possible attributes.
      // Hover to view descriptions of existing attributes.
      // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
      "version": "0.2.0",
      "configurations": [
        {
          "type": "node",
          "request": "launch",
          "name": "Express App",
          "skipFiles": ["<node_internals>/**"],
          "program": "${workspaceFolder}/index.js"
        }
      ]
    }
  • Hit the play debug button to run the application
  • Place breakpoint in the application to stop the application to view the line.

Exercises​

Using Breakpoints In Chrome DevTools​

  • Click the Sources tab.
  • Open the file containing the line of code you want to break on.
  • Go the line of code.
  • To the left of the line of code is the line number column. Click on it. A blue icon appears on top of the line number column. A line-of-code breakpoint.

Exercises​

Resources​