How do I lowercase a nested struct name when using json.marshal?

Question

I'm exposing a REST endpoint with some data. It's a struct, say:

type status struct { Config struct { Allow bool `json:"allow"` Expired bool `json:"expired"` } Database struct { Healthy bool `json:"healthy"` WaitCount int64 `json:"wait_count"` } }

I'm using the json tag to denote how a struct field should look when calling the endpoint. Using the above, I'm getting the following payload as response:

{ "Config": { "allow": false, "expired": false, }, "Database": { "healthy": true, "wait_count": 1, }, }

I'd like for Config and Database to be lowercase, meaning config and database. However, changing them to that in the Go code means the "encoding/json" package cannot "see" them as they aren't exported outside of the package scope.

How do I lowercase the nested struct's in the json response payload?

2 revs user13631587 · Accepted Answer · 2021-11-09 07:32:56Z

The nested struct is a field in the containing struct. Add a field tags as you did with the other fields:

type status struct { Config struct { Allow bool `json:"allow"` Expired bool `json:"expired"` } `json:"config"` // <-- add tag here ... Database struct { Healthy bool `json:"healthy"` WaitCount int64 `json:"wait_count"` } `json:"database"` // <-- ... and here }

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