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encoding/json: marshal map[string]interface{} with error get empty object #26889

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meilihao opened this issue Aug 9, 2018 · 1 comment
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encoding/json: marshal map[string]interface{} with error get empty object #26889

meilihao opened this issue Aug 9, 2018 · 1 comment
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@meilihao
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meilihao commented Aug 9, 2018

What version of Go are you using (go version)?

go version go1.11beta3 linux/amd64

Does this issue reproduce with the latest release?

go version go1.10.3 linux/amd64

What did you do?

func main() {
	err := errors.New("abc")
	m := map[string]interface{}{
		"error": err,
	}
	data, _ := json.Marshal(m)
	fmt.Println(string(data))
}

What did you expect to see?

{"error":"abc"}

What did you see instead?

{"error":{}}
@mvdan
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mvdan commented Aug 9, 2018

You're marshaling an interface. And it so happens that the errors package returns a struct with no exported fields, hence {}: https://golang.org/src/errors/errors.go?s=293:320#L1

If you want to print the error string, use "error": err.Error().

@mvdan mvdan closed this as completed Aug 9, 2018
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@mvdan @meilihao @gopherbot