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You could use jquery's parseJSON() function.

var str = '["5703","5704"]';
var parsed = $.parseJSON( str );

The parsed object now contains the array: ["5703","5704"]

Reference - jQuery.parseJSON( json )

"Takes a well-formed JSON string and returns the resulting JavaScript object."

You could use jquery's parseJSON() function.

var str = '["5703","5704"]';
var parsed = $.parseJSON( str );

The parsed object now contains the array: ["5703","5704"]

Reference - jQuery.parseJSON( json )

"Takes a well-formed JSON string and returns the resulting JavaScript object."