[javascript] How to test if a string is JSON or not?

All json strings start with '{' or '[' and end with the corresponding '}' or ']', so just check for that.

Here's how Angular.js does it:

var JSON_START = /^\[|^\{(?!\{)/;
var JSON_ENDS = {
  '[': /]$/,
  '{': /}$/
};

function isJsonLike(str) {
    var jsonStart = str.match(JSON_START);
    return jsonStart && JSON_ENDS[jsonStart[0]].test(str);
}

https://github.com/angular/angular.js/blob/v1.6.x/src/ng/http.js

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