expressjs / body-parser / 31746919739

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perf(json): avoid first-char regex for direct JSON bodies (#744)

Skip the RFC 7159 whitespace scan when strict JSON bodies start directly with `{` or `[`. This avoids regex execution on the common valid path while preserving strict-mode handling for leading whitespace and primitive values.

Update the first non-whitespace regex to match end-of-string so whitespace-only bodies return `undefined` without relying on a failed match/backtracking path.

8 of 8 new or added lines in 1 file covered. (100.0%)

225 of 229 relevant lines covered (98.25%)

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