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The method to repopulate the form inputs in ExpressJS is to pass the form data back to the view with the help of a template engine such as EJS or Handlebars. This can be done by passing the form data as a variable to the render function and then using the value attribute in the input tags in the view to display the previously entered values. For example, if the form had a text input field with name "username", the repopulation code in EJS would look like:
<input type="text" name="username" value="<%= username %>">
This would display the previously entered value of "username" in the input field when the form is rendered.