title: TypeError: Cannot create property '_id' on string
body: <p>I am creating simple rest API I have an endpoint for post/data to save data to the MongoDB from external API, </p>
  
  <p>Here is what I have so far:</p>
  
  <pre><code>app.post('/data', (req, res) =&gt; {
      let url = 'https://api.themoviedb.org/3/movie/401478/reviews?api_key=4d9c9de3bdf0d3b6837c49c086e3b190';
      request(url, function (error, response, body) {
          db.collection('data').insert(body, (err, result) =&gt; {
              if (err) {
                  res.send({
                      'error': 'An error has occured'
                  });
              } else {
                      res.send(result.ops[0]);
              }
          });
      });
  });
  </code></pre>
  
  <p>when i test api in postman <code>localhost:8000/data</code> in console I get error:</p>
  
  <blockquote>
    <p>TypeError: Cannot create property '_id' on string</p>
  </blockquote>
  
  <p>What am I doing wrong here?</p>