How to Sort JSON Keys in Go?

Sorting Keys in JSON Output in Go

To order keys alphabetically in Python, one can utilize json.dumps with the sort_keys=True argument. How can a similar result be achieved in Go?

Solution

Unlike Python, Go's json package automatically arranges keys lexicographically when marshalling. This behavior manifests in two ways:

• Keys in maps are sorted in alphabetical order.
• Keys in structs are marshalled in the order they are defined within the struct.

The sorting mechanism is implemented in http://golang.org/src/pkg/encoding/json/encode.go?#L359.

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