Loose comparison, characters appended which still result in type coercion

Loose comparison of string with appended character, which still end up type coerced.

Created Jan 6, 2025

Updated May 27, 2025

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CategoryCharacter Encoding

VisibilityPublic

TypeJS

CharsetUTF-8

Template used:

if('1337' + String.fromCodePoint($[i]) + String.fromCodePoint($[i]) == 1337){log($[i])}

Sample payloads

if('1337' + String.fromCodePoint(9) + String.fromCodePoint(9) == 1337){alert(9)}

if('1337' + String.fromCodePoint(10) + String.fromCodePoint(10) == 1337){alert(10)}

if('1337' + String.fromCodePoint(11) + String.fromCodePoint(11) == 1337){alert(11)}

if('1337' + String.fromCodePoint(12) + String.fromCodePoint(12) == 1337){alert(12)}

if('1337' + String.fromCodePoint(13) + String.fromCodePoint(13) == 1337){alert(13)}

if('1337' + String.fromCodePoint(32) + String.fromCodePoint(32) == 1337){alert(32)}

if('1337' + String.fromCodePoint(160) + String.fromCodePoint(160) == 1337){alert(160)}

if('1337' + String.fromCodePoint(5760) + String.fromCodePoint(5760) == 1337){alert(5760)}

if('1337' + String.fromCodePoint(8192) + String.fromCodePoint(8192) == 1337){alert(8192)}

if('1337' + String.fromCodePoint(8193) + String.fromCodePoint(8193) == 1337){alert(8193)}

if('1337' + String.fromCodePoint(8194) + String.fromCodePoint(8194) == 1337){alert(8194)}

if('1337' + String.fromCodePoint(8195) + String.fromCodePoint(8195) == 1337){alert(8195)}

if('1337' + String.fromCodePoint(8196) + String.fromCodePoint(8196) == 1337){alert(8196)}

if('1337' + String.fromCodePoint(8197) + String.fromCodePoint(8197) == 1337){alert(8197)}

if('1337' + String.fromCodePoint(8198) + String.fromCodePoint(8198) == 1337){alert(8198)}

if('1337' + String.fromCodePoint(8199) + String.fromCodePoint(8199) == 1337){alert(8199)}

if('1337' + String.fromCodePoint(8200) + String.fromCodePoint(8200) == 1337){alert(8200)}

if('1337' + String.fromCodePoint(8201) + String.fromCodePoint(8201) == 1337){alert(8201)}

if('1337' + String.fromCodePoint(8202) + String.fromCodePoint(8202) == 1337){alert(8202)}

if('1337' + String.fromCodePoint(8232) + String.fromCodePoint(8232) == 1337){alert(8232)}