Syntax for empty dictionary in YAML

Question

How do I denote an empty dictionary in YAML? I.e. it should be semantically equivalent to the empty json-object {}.

Answer 1

Short answer: use {}

There are two ways to denote mappings (dictionaries) in yaml; flow mappings and block mappings:

block_mapping:
    name:  foo
    id:    bar
flow_mapping: { name: foo, id: bar }
empty_flow_mapping: {}

The flow mapping style is thus suitable for representing empty mappings.