Json – Do the JSON keys have to be surrounded by quotes

jsonjson5specificationsstandards-compliance

Example:
Is the following code valid against the JSON Spec?

{
    precision: "zip"
}

Or should I always use the following syntax? (And if so, why?)

{
    "precision": "zip"
}

I haven't really found something about this in the JSON specifications. Although they use quotes around their keys in their examples.

Best Solution

Yes, you need quotation marks. This is to make it simpler and to avoid having to have another escape method for javascript reserved keywords, ie {for:"foo"}.