Go return struct as JSON in HTTP request [duplicate]

Question

I've defined the following struct in Go:

type repoStars struct { name string owner string stars int }

And I've created an array repoItems := []repoStars{} which has multiple items of the struct above.

This is how repoItems looks like:

I'm trying to return those items as a JSON response:

    w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(repoItems)

And it seems empty

What am I doing wrong here?

please read this document: yourbasic.org/golang/public-private to know more about public and private variables, it's mistake that happens for all of us — ttrasn
– ttrasn, Commented Jan 18, 2023 at 10:31

blackyellow · Accepted Answer · 2023-01-18 10:31:19Z

2

If the struct fields start with a lower case letter it means unexported. All unexported fields won't be serialised by the encoder.

Change it to capital first letter.

type repoStars struct {
    Name string
    Owner string
    Stars int
}

answered Jan 18, 2023 at 10:31

blackyellow

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1 Comment

Thijs van der Heijden Over a year ago

Please add some information on using JSON tags in Go. By exporting the fields they are indeed marshalled, but they will not be marshalled according to JSON conventions (all lowercase + snake case).

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