title: How to convert all integers in a json file to strings via jq command?
body: <p>Suppose that we have a <code>a.json</code> file. The file contains many attributes.
  For example in the file, I just show two attributes "name" and "age".
  In fact there are more attributes having numerical values though.</p>
  
  <pre><code>{
    "name":[
      "James", 
      "Alek", 
      "Bob"
    ],
    "age":[
      35,
      25,
      23
    ]
    ...//other attributes with numerical values
  } 
  </code></pre>
  
  <p>How can we convert the file like the following?</p>
  
  <pre><code>{
    "name":[
      "James", 
      "Alek", 
      "Bob"
    ],
    "age":[
      "35",
      "25",
      "23"
    ]
    ...//other attributes with numerical values
  } 
  </code></pre>