SyntaxError: Unexpected token o in JSON at position code example

Example 1: "SyntaxError: Unexpected token o in JSON at position 1

var newData = JSON.stringify(userData)

Example 2: SyntaxError: Unexpected token u in JSON at

That error is normally seen when the value given to JSON.parse is actually undefined. 
So, I would check the code that is trying to parse this - most likely you are not parsing the actual string shown here.

Example 3: unexpected token s in json at position 0

var s = '"something"';
var result = JSON.parse(s);

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