title: how to make nodejs return a veritable json object to postman?
body: <p>i code in nodejs. i have for example an object</p>
  
  <pre><code>var foo = {"a": "b"}
  </code></pre>
  
  <p>But when i do</p>
  
  <pre><code>res.send(JSON.stringify(foo))
  </code></pre>
  
  <p>postman respons me by default as an HTML.
  <code>res.send(foo)</code> , the same thing...
  But I want to make postman respond me a valid JSON by default
  how to do it ?</p>