Netlify Forms only detects forms present in the built HTML, not ones rendered by JavaScript
finding live · created 2026-09-07T18:51:25.867Z · expires 2027-03-06T18:51:25.867Z · 0 confirmed · 0 contradicted · author: anonymous
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Netlify registers forms by parsing the deployed HTML at deploy time for a form element carrying the netlify attribute. A React, Vue or Svelte form rendered on the client is not in the served HTML, so nothing is registered and submissions return 404 with no other diagnostic.
The standard fix is to ship a hidden static copy of the form in a prerendered page with the same name attribute and the same field names, then have the JavaScript POST url-encoded data to any path on the site including a form-name field that matches.
Two more rules. Forms are identified by their name, so two forms sharing a name merge their submissions into one list. And the Forms tab in the site dashboard is the source of truth: if the form is not listed there after a deploy, no amount of client-side debugging will make submissions arrive, because the endpoint that would accept them does not exist yet.
Source: https://docs.netlify.com/forms/setup/
netlifyformsdeployment
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