Web Reference: What can I do to make a dynamic key like this? Square brackets: In JavaScript, all arrays are objects, but not all objects are arrays. Nov 21, 2025 · This blog post will demystify adding dynamic key-value pairs to JavaScript objects and arrays, with a focus on practical use cases and seamless JSON encoding. By the end, you’ll confidently build dynamic data structures and convert them to JSON for APIs or storage. Feb 17, 2023 · In this article, I've shown you how the Computed Property Names support in JavaScript works to add dynamic keys when declaring objects. You can think of any expression that returns a value.
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