How to Sort JSON Keys in Go: Replicating Python's `sort_keys` Functionality?

Sorted JSON Keys in Go: Replicating Python's Behavior

In Python, generating JSON with sorted keys is straightforward using the sort_keys argument in the json.dumps() function. However, Go's standard library doesn't seem to provide an equivalent option. How can we achieve similar functionality in Go?

Go's Key Ordering Behavior

The good news is that the Go encoding/json package handles key ordering internally. Here's how it works:

• Maps: Keys are sorted lexicographically (alphabetically).
• Structs: Keys are marshalled in the order they are defined within the struct.

A Simple Solution

To produce JSON with sorted keys in Go, you can take advantage of the built-in ordering behavior.

Consider the following JSON object:

{
  "name": "John Smith",
  "age": 30,
  "city": "New York"
}

You can create this object in Go using a map:

import (
    "encoding/json"
)

type Person struct {
    Name  string
    Age   int
    City  string
}

func main() {
    person := Person{
        Name:  "John Smith",
        Age:   30,
        City:  "New York",
    }

    jsonBytes, _ := json.Marshal(person)
    jsonStr := string(jsonBytes)

    // Output sorted JSON
    println(jsonStr)
}

In this example, the map keys are sorted lexicographically, resulting in:

{
  "age": 30,
  "city": "New York",
  "name": "John Smith"
}

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