WebStorm 2016.3 Help

Types of Breakpoints

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Introduction

WebStorm lets you create breakpoints of several types. Each breakpoint type supported by WebStorm addresses different debugging needs and has its own individual settings. Depending on the context, WebStorm distinguishes between the following types of breakpoints:

  • JavaScript line breakpoints can be set in the JavaScript context inside *.js or *.html files.
  • JavaScript exception breakpoints

Line breakpoint

These breakpoints are assigned to lines of source code and are used to target a particular section for debugging.

Line breakpoints are triggered when the program reaches the specified line of source code, before it is executed. The line of code that contains a set breakpoint, is marked with a red stripe; once such line of code is reached, the marking stripe changes to blue.

If a file with breakpoints has been modified externally, for example, updated from a version control repository, or changed in an external editor, so that line numbers are changed, then the breakpoints will be moved accordingly. Note that WebStorm should be running at the moment of such modification; otherwise, such changes will pass unnoticed.

Temporary Line breakpoint

These breakpoints are assigned to lines of source code and are used to target a particular section for debugging. When hit, such breakpoints are immediately removed.

Exception breakpoint

Exception breakpoints are triggered when the specified exception is thrown. Unlike the line breakpoints, which require specific source references, exception breakpoints apply globally to the exception condition, rather than to a particular code reference.

See Also

Last modified: 1 December 2016