Developer ports Node.js query-string library qs to Go, passes 95% of original tests

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A developer spent a weekend porting qs, the popular Node.js query-string parser with 8.9k GitHub stars, to Go as a standalone static binary with no external dependencies. To validate correctness, the Go code was compiled into a CLI that communicates via JSON over stdin/stdout, and Node's module loader was intercepted so the original, unmodified qs test suite ran against the Go port transparently. The port initially passed 166 of 241 parse tests, eventually reaching 221 of 241 and 390 of 410 across the full suite, a 95% pass rate. Most failures were traced to specific bugs, including a merge function that lost track of a value's original type and a key parser that resolved bracket-index ambiguity too late in the pipeline. The project highlighted how porting rules that forbid modifying the original test suite prevent shortcuts and force genuine compatibility.

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ProgrammingDEV Community ·

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