heapless | Heapless , ` static ` friendly data structures | Hashing library

The serde-json-core crate can deserialize JSON arrays into any type that implements the Deserialize trait. If you want to avoid memory allocations, you need to pick a container that does not allocate.

If the size of the array is known in advance, you can simply use a fixed-sized array, i.e. [T; N]. This will return a deserialization error if the size of JSON array is not exactly N.

If the size of the JSON array is variable with a known upper limit, you can use one of various vector-like stack-allocated datastructures. One such option is the heapless::Vec, which implements Deserialize if you enable the serde feature for heapless. In your Cargo.yaml file, you can do this like this: