Golang Unmarshal an JSON response, then marshal with Struct field names - go

Question

So I am hitting an API that returns a JSON response and I am unmarshalling it into a struct like so:
package main
type ProcessedRecords struct {
SLMIndividualID string `json:"individual_id"`
HouseholdPosition int `json:"Household Position"`
IndividualFirstName string `json:"individual_first_name"`
}
func main() {
req, _ := http.NewRequest(method, url, payload)
res, err := client.Do(req)
if err != nil {
fmt.Println(err)
}
defer res.Body.Close()
body, err := ioutil.ReadAll(res.Body)
if err != nil {
fmt.Println(err)
}
fmt.Println(body)
var responseObject Response
json.Unmarshal(body, &responseObject)
fmt.Println(responseObject)
which works great. However I need to marshal this struct again but I want to use the Struct Fields as keys instead of the json: ... fields. I am using the following code:
recordsInput := []*firehose.Record{}
for i := 0; i < len(records); i++ {
if len(recordsInput) == 500 {
* code to submit records, this part works fine *
}
b, err := json.Marshal(records[i])
if err != nil {
log.Printf("Error: %v", err)
}
record := &firehose.Record{Data: b}
recordsInput = append(recordsInput, record)
}
This does submit records successfully but it's in the format:
{"individual_id":"33c05b49-149b-480f-b1c2-3a3b30e0cb6f","Household Position":1...}
and I'd like it in the format:
{"SLMIndividualId":"33c05b49-149b-480f-b1c2-3a3b30e0cb6f","HouseholdPosition":1...}
How can I achieve this?

Answer 1

Those tags say how the struct should be marshalled, so if they are present, that is how the output will be. You'll need to convert it to a matching struct that does not have the json: tags:
type ProcessedRecords struct {
SLMIndividualID string `json:"individual_id"`
HouseholdPosition int `json:"Household Position"`
IndividualFirstName string `json:"individual_first_name"`
}
type ProcessedRecordsOut struct {
SLMIndividualID string
HouseholdPosition int
IndividualFirstName string
}
func process() {
var in ProcessedRecords
json.Unmarshal(data, &in)
// Convert to same type w/o tags
out := ProcessedRecordsOut(in)
payload, _ := json.Marshal(out)
// ...
}
See a working example here: https://play.golang.org/p/p0Fc8DJotYE

Answer 2

You can omit fields one-way by defining a custom type and implementing the correct interface, e.g.
package main
import (
"encoding/json"
"fmt"
)
type Animal struct {
Name ReadOnlyString
Order string
}
type ReadOnlyString string
func (ReadOnlyString) UnmarshalJSON([]byte) error { return nil }
func main() {
x := Animal{"Bob", "First"}
js, err := json.Marshal(&x)
if err != nil {
fmt.Println("error:", err)
}
fmt.Printf("%s\n", js)
var jsonBlob = []byte(`{"Name": "Platypus", "Order": "Monotremata"}`)
if err := json.Unmarshal(jsonBlob, &x); err != nil {
fmt.Println("error:", err)
}
fmt.Printf("%#v\n\n", x)
}
https://go.dev/play/p/-mwBL0kIqM
Found this answer here: https://github.com/golang/go/issues/19423#issuecomment-284607677