Decimal separators in parseFloat

Fuzzes for characters that are treated as decimal separators in either parseFloat or the Number constructor.

Novice Fuzzer

Created bypiprett

Created May 17, 2026

Updated May 17, 2026

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CategoryJavaScript Syntax

VisibilityPublic

TypeJS

CharsetUTF-8

Template used:

const c = String.fromCodePoint(i);0x0D
if (parseFloat("13"+c+"37") === 13.37 || Number("13"+c+"37") === 13.37) log(i);

Sample payloads

const c = String.fromCodePoint(i);0x0D
if (parseFloat("13"+c+"37") === 13.37 || Number("13"+c+"37") === 13.37) alert(i);