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Error Handling in Golang JSON Marshalling
JSON data structures cannot represent cyclic references, and Go's json.Marshal function cannot handle them. As a result, passing cyclic structures to Marshal leads to an infinite recursion and a runtime panic.
Beyond cyclic structures, json.Marshal can also return non-nil errors in situations where it encounters unsupported types or invalid values.
Unsupported Types
Marshal returns an UnsupportedTypeError when attempting to marshal an unsupported data type. For example:
<code class="go">import "encoding/json" func main() { ch := make(chan int) _, err := json.Marshal(ch) if _, ok := err.(*json.UnsupportedTypeError); ok { // Error: Unmarshal: unsupported type: chan int } }</code>
Unsupported Values
Marshal can also return an UnsupportedValueError when attempting to marshal an invalid value. For instance:
<code class="go">import ( "encoding/json" "math" ) func main() { positiveInfinity := math.Inf(1) _, err := json.Marshal(positiveInfinity) if _, ok := err.(*json.UnsupportedValueError); ok { // Error: json: unsupported value: +Inf } }</code>
By understanding these conditions, developers can handle errors gracefully and ensure that json.Marshal returns the expected results or handle the appropriate errors.
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