struct JSON::Any

Overview

JSON::Any is a convenient wrapper around all possible JSON types (JSON::Any::Type) and can be used for traversing dynamic or unknown JSON structures.

require "json"

obj = JSON.parse(%({"access": [{"name": "mapping", "speed": "fast"}, {"name": "any", "speed": "slow"}]}))
obj["access"][1]["name"].as_s  # => "any"
obj["access"][1]["speed"].as_s # => "slow"

Note that methods used to traverse a JSON structure, #[] and #[]?, always return a JSON::Any to allow further traversal. To convert them to String, Int32, etc., use the as_ methods, such as #as_s, #as_i, which perform a type check against the raw underlying value. This means that invoking #as_s when the underlying value is not a String will raise: the value won't automatically be converted (parsed) to a String. There are also nil-able variants (#as_i?, #as_s?, ...), which return nil when the underlying value type won't match.

Included Modules

Defined in:

ext.cr
json-merge-patch.cr

Instance Method Summary

Class methods inherited from module JSON::RFC7396

merge(left : JSON::Any, right : JSON::Any, & : String, JSON::Any -> JSON::Any | Nil)
merge(left : JSON::Any, right : JSON::Any)
merge

Instance Method Detail

def merge(other : JSON::Any) : JSON::Any #

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