When should I use \u{XXXXX} with curly braces?

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Free Utility

JavaScript Unicode Converter

Convert JavaScript strings and code into \uXXXX and ES6 \u{XXXXX} Unicode escape sequences, or unescape back into clean readable text.

ES6 \u{XXXXX} for astral planesEscape all characters (ASCII included)

RAW JAVASCRIPT / STRING

90 chars • 13 words

UNICODE ESCAPED JAVASCRIPT

118 chars • 118 B

const greeting = "Hello, world! \u{1F680} \u20AC100 \u00DCber caf\u00E9";\u000Aconst regex = /[\u{1F600}-\u{1F64F}]/u;

Compatibility Notice:

Standard \uXXXX escapes support characters in the Basic Multilingual Plane (up to U+FFFF). For emoji and astral symbols (U+10000+), modern ECMAScript (ES2015+) supports \u{XXXXX} syntax with the u flag. Disabling ES6 brackets converts them into traditional UTF-16 surrogate pairs (🚀).

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Frequently Asked Questions

ES6 introduced curly braces \u{...} for code points above 0xFFFF (such as emoji and musical symbols), eliminating the need for 16-bit surrogate pairs.

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