How to solve utf8_encode issue in laravel 5.2?

If my application, i am fetching all posts data using eloquent models and sending its response as json to another application, if the post content contains any special character it is showing following error,

after a long search i solved it by using

$post->content = utf8_encode($post->content);

now the problem is after sending this json to another app where data displaying in browser special characters are not decoding they shows as

how can we solve this in browser, currently i am using angularjs as frontend.

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