Adding a field to a json object

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2

You can do it like this:

require "json"

json = JSON.parse(%({"foo": 1}))
json.as_h["bar"] = JSON::Any.new(2_i64)
puts json.to_json

It’s a bit cumbersome but there’s no other way because Crystal is statically typed.

We could consider adding more and more methods to JSON::Any, like []= but I don’t know.