JSON tags in Golang Structs are case-insensitive

After debugging an issue for a while, I realized that the JSON tags in Golang structs are case-insensitive. Below is a code sample that demonstrates this.

package main

import (
    "fmt"
	"encoding/json"
)

type Person struct {
	Name string `json:"Name"`
}

var stringifiedJSON = `{"Name": "mallikarjuna", "name": "abhilash"}`

func main() {
	var person Person
	if err := json.Unmarshal([]byte(stringifiedJSON), &person); err != nil {
		fmt.Println(err)
        return
	}
	fmt.Println(person.Name) // abhilash
}

Go playground link

Explanation from the docs:

To unmarshal JSON into a struct, Unmarshal matches incoming object keys to the keys used by Marshal (either the struct field name or its tag), preferring an exact match but also accepting a case-insensitive match.

Read entire docs here.