404 error after submit with React

[Melvin]

Hi @Passemoildev,

Thanks for reaching out and welcome to Netlify’s Support Forums!

We have a Support Guide here on troubleshooting common issues with forms:

[Support Guide] Form problems, form debugging, 404 when submitting

Last reviewed August 2023 Please give these debugging tips a try before making a new post. If none of the suggestions work, please include the information that we request at the end of this guide in the new post that you create. Thank you! Why use Forms? Forms are one of the most useful parts of modern websites because they allow us to capture input from our visitors. There are many ways to use forms: contact forms, such as contact forms and sign-up forms. Seeing as there are many types of fo…

Could you review the guide to see if that helps with resolving the issue?