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Set a breakpoint based on a certain condition

Set a breakpoint based on a certain condition

When you set a breakpoint, you can make it conditional based on the result of an expression. Right click on the line gutter and select Add Conditional Breakpoint and enter your expression.

If you have a callback like:

function callback(result, err) {
    //set a conditional breakpoint based on the existence of err
}

You could set a conditional breakpoint based on the existence of err.