Web Reference: How to Resolve "TypeError: Cannot set properties of undefined" Error in JavaScript The TypeError: Cannot set properties of undefined (setting '...') is a very common error in JavaScript. It occurs when you try to assign a value to a property of a variable that holds the value undefined. Aug 5, 2025 · This error typically occurs when we attempt to assign a value to the property of an undefined object. In this article, we will explore the causes of this error how to identify it, and the steps taken to fix it. In essence d ["1"] is undefined. you never set d[a] to any value. Because of this, d[a] evaluates to undefined, and you can't set properties on undefined. If you add d[a] = {} right after d = {} things should work as expected. Alternatively, you could use an object initializer: greetings: b, data: c.
YouTube Excerpt: In this quick JavaScript tutorial, we'll fix the common error: "Uncaught TypeError:
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