I developed a JSON Parser for C# named DynaJson. It is very strict to the standard of RFC 8259. It accepts all conformant and rejects all non-conformant JSONs except for two exceptions.
One exception is trailing-commas. Another is leading 0 in numbers, for example, 02
and -02
. The former is for practicality. The latter is for compatibility with DynamicJson.
JSON's grammar is simple, but carelessly implemented parsers don't accept all conformant and not reject non-conformant JSONs. An excellent article of Parsing JSON is a Minefield shows where mines are in implementing JSON parsers.
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