clone-deep is a utility for creating deep copies of JavaScript values, including objects, arrays, and primitive types. It recursively duplicates all nested structures, ensuring that the cloned object is completely independent of the original. This avoids unintended modifications to the original data when working with the copied version. clone-deep handles circular references and ensures data integrity during the cloning process, making it suitable for scenarios where preserving data immutability is crucial. It is a popular choice for preventing side effects when working with complex data structures.
The clone-deep npm package has seen sporadic releases. Initial development occurred in 2014-2015. A period of inactivity followed until 2017, when versions 0.3.0, 1.0.0, 2.0.0 and 2.0.1 were published. The most recent activity was in 2018 with versions 2.0.2, 3.0.0, 3.0.1, 4.0.0 and 4.0.1. There have been no releases since November 2018.
Clone-deep's npm downloads saw consistent growth from March 2024 to June 2025, peaking at over 95 million. July and August 2025 experienced slight dips, and September 2025, still in progress, shows a significant decrease in downloads compared to previous months.
