fast-json-patch is a blazing-fast JavaScript library for applying JSON Patches (RFC 6902). Efficient and lightweight, it calculates differences between JSON documents and applies them bidirectionally. Ideal for real-time collaborative applications or server-side synchronization. Minimizes data transfer and processing for improved performance compared to naive JSON merging. Supports tracking moved object patches and produces standard JSON Patch format results. A crucial tool for developing efficient data synchronization solutions.
Fast-json-patch's release frequency is inconsistent. Activity peaked in 2016-2017, with multiple releases per month. Releases slowed significantly after 2019, with only occasional updates in 2021 and 2022. There have been no releases since March 2022, and no releases so far in 2025.
Fast-json-patch npm package downloads show a generally increasing trend, peaking in July 2025 at 16.6 million. From March 2024 to August 2025, downloads consistently exceeded 10 million monthly. September 2025 shows significantly lower downloads (3.8 million), but the month is not yet complete.
