Are decimals without leading zeros valid JSON?

Question

Given the JSON document

{"percentageAmount": .01}

Running it by JSONLint.com results in the error:

Parse error on line 2:
..."percentageAmount": .01}
-----------------------^
Expecting 'STRING', 'NUMBER', 'NULL', 'TRUE', 'FALSE', '{', '['

On the other hand, this is valid:

{"percentageAmount": 0.01}

The code is parsed correctly if assigned to a variable as a JavaScript literal, but of course there are many things that are OK for JavaScript variables that aren't JSON spec.

Why is this against JSON spec?

Answer 1

Nope.

According to the railroad diagram for numbers at JSON.org, numbers with fractional values must have digits before the decimal point: