javascript - Is there any native function to convert json to url parameters? - Stack Overflow

jQuery.param does exactly that. If you don't use jquery, take at look at the source.

If you're really keen to reinvent wheels though, it goes like this:

url = Object.keys(data).map(function(k) {      return encodeURIComponent(k) + '=' + encodeURIComponent(data[k])  }).join('&')

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