title: Calculate price on frontend insecure?
body: <p>I wonder if it would be possible to manipulate a price calculation that is done on the frontend? I read a lot about JavaScript price calculators with the business logic solely on the client side, but nothing about security.</p>
  
  <p>Consider the following scenario:</p>
  
  <ul>
  <li>A React app has a component (form) that calculates a price based on the states (user interaction) of it's child components (form inputs).</li>
  <li>The prices for these child components come from an API.</li>
  <li>But the calculation is handled by the parent component – on the frontend.</li>
  </ul>
  
  <p>Is it possible to send a manipulated calculation result through the form?</p>