title: express.json() is not parsing nested json object. it return [object Object] instead
body: <p>express.json() is not parsing nested json object. it return [object Object] instead.</p>
  <pre><code>express - 4.17.1,
  </code></pre>
  <p>Request Headers</p>
  <pre><code>Content-Type: application/json;charset=UTF-8
  </code></pre>
  <p>I m using express.json() as follows.</p>
  <pre><code>app.use(express.json());
  </code></pre>
  <p>when i post data without nested object. it works</p>
  <pre><code>const data = await this.$axios.$post(`user/update/${this.username}`, {confirmationCode:  &quot;code&quot;});
  </code></pre>
  <p>now req.body.confirmationCode is &quot;code&quot;.</p>
  <p>but if i post nested json object. It doesn't works</p>
  <pre><code>const data = await this.$axios.$post(`user/update/${this.username}`, {confirmationCode: { mobile: &quot;code&quot;}});
  </code></pre>
  <p>now req.body.confirmationCode.mobile is undefined.
  and req.body.confirmationCode is [object Object].</p>