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fix(query): array with empty string elements serializes with trailing equals unlike scalar empty string #394
Description
Description
In encodeQueryItem(), when a scalar empty string "" is passed, it returns encodeQueryKey(key) without an = sign:
encodeQueryItem("flag", "")
// Returns: "flag"However, when an array containing an empty string element [""] is passed, the array mapping unconditionally formats as ${encodeQueryKey(key)}=${encodeQueryValue(_value)}, producing an = sign:
encodeQueryItem("flag", [""])
// Returns: "flag="Minimal Reproduction
import { encodeQueryItem, stringifyQuery } from 'ufo'
console.log(encodeQueryItem('flag', '')) // "flag"
console.log(encodeQueryItem('flag', [''])) // "flag="Expected Behavior
Array elements with empty string values should follow the same encoding convention or format consistently with scalar values when stringified.
Activity
owenshen0907 commentedon Oct 11, 2026
I reproduced the difference on current main and added regression tests for scalar/array empty strings, mixed values and encoded keys. I'm preparing a minimal fix for empty string array elements to use the same bare-key encoding as scalar empty strings; null/undefined array behavior stays unchanged. I checked #391: its performance change touches the same branch but retains the behavior reported here, so this fix may need rebasing if it merges first.
abhi-byte62 commentedon Oct 11, 2026
Thanks for verifying and putting together the fix @owenshen0907! Good catch on keeping the null/undefined array behavior intact and watching out for the overlap with #391. Looking forward to the PR!