how to access json object that is in a form of array in javascript

I am trying to access merchant name in the following json:

[{“merchant_id”:”90151″,”merchant_name”:”Wimpy”}]

the above json formt is returned by an api, I tried access merchant_name value but all I got was none

below is what I tried:

fetch("http://127.0.0.1:8000/vcl/retrieve/"+url, {
          method: "GET",
          headers: {
            "Content-Type": "application/json"
          },
        }).then((res) => res.json()).then((response) => {  
          console.log (response);
          const data = JSON.stringify(response);
          const info = JSON.parse(data);
          var merchant_name = info.merchant_name;
          console.log(merchant_name);
        })

all I am getting is undefined