How to Handle Errors in Golang\'s json.Marshal?

Demonstrating Error Handling in golang's json.Marshal

In json.Marshal errors can occur due to cyclic data structures or invalid input types/values. To comprehend these scenarios, let's examine a few examples.

Cyclic Data Structures

json.Marshal fails to marshal cyclic data structures, leading to an infinite recursion and a runtime panic. However, non-cyclic structures can be successfully marshaled.

Invalid Input Type

json.Marshal can also encounter errors when presented with invalid input types. For instance, attempting to marshal a channel will result in an UnsupportedTypeError due to its incompatible type.

<code class="go">_, err := json.Marshal(make(chan int))
if _, ok := err.(*json.UnsupportedTypeError); !ok {
    fmt.Println("Unexpected error type:", err)
}</code>

Invalid Input Value

Invalid input values can also trigger errors in json.Marshal. Marshalling values like math.Inf or math.NaN will return an UnsupportedValueError.

<code class="go">_, err := json.Marshal(math.Inf(1))
if _, ok := err.(*json.UnsupportedValueError); !ok {
    fmt.Println("Unexpected error type:", err)
}</code>

By understanding these error scenarios, developers can proactively handle or prevent errors in json.Marshal, ensuring the integrity and reliability of their data processing.

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