What is the ‘Strict’ mode in JavaScript and how can it be enabled?

What compulsions does ‘Strict’ mode add to javascript? How to enable ‘Strict’ mode in javascript.

  • Soni
  • 30 Apr 2026
  • 1049 Views
  • 2 Answers
Your Answer

Strict mode is a way to introduce better error-checking into your code. When you use strict mode, you cannot, for example, use implicitly declared variables, or assign a value to a read-only property, or add a property to an object that is not extensible.
You can enable strict mode by adding “use strict”; at the beginning of a file, a program, or a function. This kind of declaration is known as a directive prologue. The scope of a strict mode declaration depends on its context. If it is declared in a global context (outside the scope of a function), all the code in the program is in strict mode. If it is declared in a function, all the code in the function is in strict mode.

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