Web API uses which library for JSON serialization?
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Json.NET is the library which uses Web API for JSON serialization. It is a third-party open source.
Jackson is without any doubt the most best JSON library in the Java world, and there are many reasons why.
Widely huge which also means it is well tested.
Reliable performance. Jackson is the fastest library out of the ones you mentioned on large input. It is not the fastest on smaller input but it is very consistent.
Jackson is the default choice for Spring Boot which says a lot.