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JavaScript variable name validator

Wondering if you can use a given string as a variable name in JavaScript? This tool will tell you. It validates identifiers according to ECMAScript 6 and Unicode 8.0.0, but also shows warnings if an identifier would be invalid as per ES5, or if an ECMAScript 3 reserved word is used, or when an otherwise valid identifier would not be valid under Unicode 3.0.0.

See Valid JavaScript variable names in ES6 for the full explanation.

Made by Mathias Bynens.