title: Axios send array in post request
body: <p>I want to post a array with a axios post request.
  This is the array I want to post</p>
  
  <pre><code>validMonths2019 = ['01', '02', '03', '04']
  </code></pre>
  
  <p>and this is how I tried to post it.</p>
  
  <pre><code> axios.post('http://localhost:5000/', {
            contractId: contractId,
            contractCompletionQuote: contractCompletionQuote,
            iterations: iterations,
            validMonths2019: validMonths2019
          })
  </code></pre>
  
  <p>But I just get undefined instead of the array</p>