how set favicon express? code example

Example 1: change src with inpute type="file"

<img id="output" src="" width="100" height="100">

<input name="photo" type="file" accept="image/*" onchange="document.getElementById('output').src = window.URL.createObjectURL(this.files[0])">

Example 2: how set defualt image for dropify

<input type="file" id="input" class="dropify" data-default-file="imagePath" />