title: what is data length/size limit of json datatype in mysql 5.7
body: <p>I am using mysql 5.7 for json type storage. I want to know what is the size/length limit of json data type in mysql 5.7.  </p>
  
  <p>I am trying to convert json object into json string and store it , but somehow it is ignoring it. So is there any way to store the length json string into json datatype ? </p>