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Asked: 2026-05-17T17:03:49+00:00

I receive error SyntaxError: Unexpected token default while getting or setting attribute default on

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I receive error “SyntaxError: Unexpected token default”
while getting or setting attribute “default” on any object in Chrome (+Opera).

({}).default

Can someone explain why this happens ?

upd: everybody, plz, becareful it doesn’t make sense for FF so while testing you can miss this bug.

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1 Answer

  1. Editorial Team

    default is a keyword in JavaScript (for the switch statement).

    Using reserved words in dot property accessors is allowed in ECMAScript Fifth Edition (specifically: the syntax for the dot property accessor is MemberExpression . IdentifierName [section 12.2.1], and IdentifierName, unlike Identifier, may be a ReservedWord [section 7.6]), but not in ECMAScript Third Edition (where it’s MemberExpression . Identifier). Third Edition is currently the baseline all browsers support.

    For safety use [] property access:

    ({})['default']= ...;

    or avoid using keywords as property names.

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