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The bug has shown up in a Java project (using Maven), but I'm not sure, if JSON files need Java projects for syntax highlighting and error checking. The problem seems to be, NetBeans assumes every JSON file to need an object container as its outermost syntactic element, while the spec doesn't require that. In fact, the nuclos project uses a JSON file consisting of an array as its outermost block, and it works, while the file is marked erroneous by NetBeans.