Zod is a TypeScript-first schema validation library with static type inference. You can create validation schemas for either field-level validation or form-level validation1. Here’s an example of how you can use Zod for schema validation for a file:
// Max size is 5MB. const MAX_FILE_SIZE = 5000000; function checkFileType(file: File) { if (file?.name) { const fileType = file.name.split(".").pop(); if (fileType === "docx" || fileType === "pdf") return true; } return false; } export const fileSchema = z.object({ z.any() .refine((file: File) => file?.length !== 0, "File is required") .refine((file) => file.size < MAX_FILE_SIZE, "Max size is 5MB.") .refine((file) => checkFileType(file), "Only .pdf, .docx formats are supported."),` }); 
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