Validate API Requests in NextJS before they reach you

The basis is the validation library zod .

withSchema works both with GET and POST requests so you don't have to worry about query vs body params. This library detects the mode and will always validate the correct one.

Usage

• npm i zod && npm i next-with-zod-schema
• Go to your api/ file in Next e.g. api/test.js

Do this (default is POST):

const BODY_SCHEMA = z.object({
  email: z.string().email(),
  type: z.enum(["normal", "unnormal"]),
});

export default withSchema(
  BODY_SCHEMA,
  async function YourApiRoute(req, res, body) {
    // if you reach this point the body data is already validated and it's also perfectly typed for TypeScript!

    console.log("the email was perfect", body.email);
    console.log("The type was perfect as well", body.type);
  }
);

Usage with GET

export default withSchema(BODY_SCHEMA, YOUR_FUNCTION, "GET");