{"a" : 1 } at Chrome cause SyntaxError

Question

I met a problem at chrome.

Why it cause a syntaxError? I have tried it in nodejs, it is ok.

Answer 1

In the context in which you are running (and the Chrome and Node REPLs have different default contexts) it, the { character starts a block, not an object literal.

You can't follow a string with a : in a block.

If you were to say ({ "a": 1 }) you would change the context so it would be an object literal.