REST API create redirect example

Hi there, we would like to use the REST API to create vanity URL redirects in a small Javascript application we are creating, and we saw your API documentation found here: https://redirection.me/developer/rest-api/

Does the data need to be POST as JSON? Can you provide a Javascript code snippet showing how to use the REST API to create a simple redirect with a source and target URL? We appreciate any help you can provide.