An API route to convert a base64 encoded image ans save it to a jpeg file.

convertImage.ts

import { writeFileSync } from "fs";
import { join } from "path";
import { NextApiRequest, NextApiResponse } from "next";

export default async (req: NextApiRequest, res: NextApiResponse) => {
  try {
    if (req.method === "POST") {
      const base64 = req.body.image;
      const cleanBase64Data = base64.replace(/^data:image\/jpeg;base64,/, ""); // Remove the data URI prefix
      const binaryData = Buffer.from(cleanBase64Data, "base64");
      const filePath = join(process.cwd(), "public", "images", "profile.jpeg");
      writeFileSync(filePath, binaryData);

      res.status(200).json({ message: "Image saved successfully" });
    } else {
      res.status(500).json({ message: "Method no allowed" });
    }
  } catch (err) {
    console.error(err);
    res.status(500).json({ message: "Internal server error" });
  }
};