SvelteKit Remote Functions Part 3: Handling Form Mutations with the form() API

A Thai developer tutorial series on SvelteKit continues with its third installment, shifting focus from data fetching (query functions) to data submission using the built-in form() remote function. The form() function is designed specifically for handling mutations such as POST and PUT requests, accepting FormData sent from the client to the server. It returns an object containing method and action properties, allowing forms to function even without JavaScript access, while also supporting progressive enhancement to prevent full page reloads when JS is available. Validation is handled by passing a Standard Schema-compatible schema as the first argument to form(), as demonstrated with a createPost example using the valibot library. This part focuses on understanding form fields defined by the schema, with future parts set to cover validation, displaying form values, and handling returns and redirects.