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YAML sucks.

YAML specification is so ambigous, that you can't be sure if tomorrow you will parse the same data from YAML file as you have yesterday.

Let's see how different implementations parse YAML code. Settings are default or near to default or typical for that language. We use JSON to represent data the uniform way.

YAML source yaml2json.hs yaml2json.pl yaml2json.py yaml2json.rb rq 
- false
- n
- off

[false,false,false]

["","n","off"]

[false, "n", false]

[false,"n",false]

[false,"n","off"]
❌ yaml2json.hs: UnexpectedEvent {_received = Nothing, _expected = Just EventStreamStart} 
null

null
❌ /usr/lib/ruby/1.9.1/json/common.rb:216:in `generate': only generation of JSON objects or arrays allowed (JSON::GeneratorError) from /usr/lib/ruby/1.9.1/json/common.rb:216:in `generate' from /usr/lib/ruby/1.9.1/json/common.rb:352:in `dump' from ./yaml2json.rb:6:in `' 
- -.inf
- .NaN

["-.inf",".NaN"]

["-.inf",".NaN"]

[-Infinity, NaN]

[-Infinity,NaN]

["-.inf",".NaN"]

- 1.23015e+3
- 12.3015e+02
- 1230.15

[1230.15,1230.15,1230.15]

["1.23015e+3","12.3015e+02","1230.15"]

[1230.15, 1230.15, 1230.15]

[1230.15,1230.15,1230.15]

[1230.15,1230.15,1230.15]

0xC

"0xC"

"0xC"

12
❌ /usr/lib/ruby/1.9.1/json/common.rb:216:in `generate': only generation of JSON objects or arrays allowed (JSON::GeneratorError) from /usr/lib/ruby/1.9.1/json/common.rb:216:in `generate' from /usr/lib/ruby/1.9.1/json/common.rb:352:in `dump' from ./yaml2json.rb:6:in `' 
12

<<

"\u003c\u003c"

"<<"
❌ ConstructorError: could not determine a constructor for the tag 'tag:yaml.org,2002:merge' in "", line 1, column 1 ❌ /usr/lib/ruby/1.9.1/json/common.rb:216:in `generate': only generation of JSON objects or arrays allowed (JSON::GeneratorError) from /usr/lib/ruby/1.9.1/json/common.rb:216:in `generate' from /usr/lib/ruby/1.9.1/json/common.rb:352:in `dump' from ./yaml2json.rb:6:in `' 
"<<"

<<: {}

{}

{"<<":{}}

{}

{"<<":{}}

{"<<":{}}

"<<": {}

{}

{"<<":{}}

{"<<": {}}

{"<<":{}}

{"<<":{}}

<<: a

{"\u003c\u003c":"a"}

{"<<":"a"}
❌ ConstructorError: while constructing a mapping in "", line 1, column 1 expected a mapping or list of mappings for merging, but found scalar in "", line 1, column 5 
{"<<":"a"}

{"<<":"a"}

a: &alias
    k1: v1
    k2: v2

b:
<<: *alias
k1: override
k3: v3



{"a":{"k2":"v2","k1":"v1"},"b":{"k3":"v3","k2":"v2","k1":"override"}}

{"b":{"k1":"override","<<":{"k1":"v1","k2":"v2"},"k3":"v3"},"a":{"k1":"v1","k2":"v2"}}

{"a": {"k2": "v2", "k1": "v1"}, "b": {"k3": "v3", "k2": "v2", "k1": "override"}}

{"a":{"k1":"v1","k2":"v2"},"b":{"k1":"override","k2":"v2","k3":"v3"}}

{"a":{"k1":"v1","k2":"v2"},"b":{"<<":{"k1":"v1","k2":"v2"},"k1":"override","k3":"v3"}}

- 1000
- +1000
- 1_000

[1000,1000,"1_000"]

["1000","+1000","1_000"]

[1000, 1000, 1000]

[1000,1000,1000]

[1000,1000,"1_000"]

[8, 08, 0o10, 010]

[8,8,"0o10",10]

["8","08","0o10","010"]

[8, "08", "0o10", 8]

[8,"08",8,8]

[8,8,8,10]

"Sosa did fine.\u263A"

"Sosa did fine.☺"
❌ Wide character in say at ./yaml2json.pl line 10, <> line 1. 
"Sosa did fine.\u263a"
❌ /usr/lib/ruby/1.9.1/json/common.rb:216:in `generate': only generation of JSON objects or arrays allowed (JSON::GeneratorError) from /usr/lib/ruby/1.9.1/json/common.rb:216:in `generate' from /usr/lib/ruby/1.9.1/json/common.rb:352:in `dump' from ./yaml2json.rb:6:in `' 
"Sosa did fine.☺"