I'm trying to build a wp theme in React.. Is there any way to use contact form 7 plugin in react using wordpress rest-api
you should be able to get the form data trough the rest api by requesting the correct post ID, and then parse the tags yourself, or you could probably also create your own endpoint that returns the generated HTML.
If you are looking for a way to post the form, you need to post the data to this endpoint: http://www.yourdomain.com/wp-json/contact-form-7/v1/contact-forms/FORM-ID/feedback
It's explained pretty clearly here: https://medium.com/@mahesh_joshi/wordpress-contact-form-7-rest-api-endpoints-bf45907b571c