Golang - convert array / map to JSON

Question

I am trying to convert a map[] to JSON so I can post it as part of a request. But my map[] has various types including strings / ints.

I currently have:

mapD := map[string]string{"deploy_status": "public", "status": "live", "version": 2}
mapB, _ := json.Marshal(mapD)
fmt.Println(string(mapB))

//output
prog.go:17: cannot use 2 (type int) as type string in map value

How do I make it so that I can include strings and ints within the same map?

Thanks

fzerorubigd · Accepted Answer · 2016-04-18 09:50:08Z

6

Use map[string]interface{} :

mapD := map[string]interface{}{"deploy_status": "public", "status": "live", "version": 2}

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answered Apr 18, 2016 at 9:50

fzerorubigd

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1 Comment

Elliot Reeve Over a year ago

Thanks I was missing the {} before then opening the {} again :)

Endre Simo · Accepted Answer · 2016-04-18 09:40:48Z

1

You are trying to use a value of type int as a string, but your map is defined as [string]string. You have to modify the first line as:

mapD := map[string]string{"deploy_status": "public", "status": "live", "version": "2"}

If you do not know the type of the values, you can use interface{} instead.

answered Apr 18, 2016 at 9:40

Endre Simo

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3 Comments

Elliot Reeve Over a year ago

I can't change the int to a string as this would be invalid on the request side so it has to stay an int.

Elliot Reeve Over a year ago

If I do the interface version: mapD := map[string]interface{"deploy_status": "public", "status": "live", "version": 2} mapB, _ := json.Marshal(mapD) fmt.Println(string(mapB)) I get the error of: syntax error: unexpected string literal

Endre Simo Over a year ago

Yes, because you're not initializing the interface correctly.You should use map[string]interface{}{...}

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