Decimal separators in parseFloat

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

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);