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Donald Trump was all treats and no tricks for hundreds of kids ... who showed up in their Halloween costumes to snag some sweets from the President and First Lady at the White House.

It all went down Thursday night on the South Lawn ... with DT sporting his signature blue suit and a "USA" hat, alongside Melania in a brown coat over an orange dress -- as Michael Jackson's "Thriller" bumped in the background. Play video content

The Trumps weren't skimping on candy ... handing out full-sized Hershey bars and Twizzlers, boxed up with the presidential seal.

The kids in attendance belonged to White House staffers and members of the military.

Some kiddos were more eager than others ... with one hilariously tapping on the President's hand

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