nextjs api handler issues error about not sending a response when response sent. wai?

for this code:

export default function handler(req: NextApiRequest, res: NextApiResponse) {
  // return promptController.specific(req, res);
  fs.readFile('json/foo.json', 'utf-8', (err, data) => {
    if (err) {
      console.error('booo', err);
      return;
    }
    console.log('yay!>>', data);
    res.status(200).send(data);
  });
}

export default function handler(req: NextApiRequest, res: NextApiResponse) {
  // return promptController.specific(req, res);
  fs.readFile('json/foo.json', 'utf-8', (err, data) => {
    if (err) {
      console.error('booo', err);
      return;
    }
    console.log('yay!>>', data);
    res.status(200).send(data);
  });
}

I'm getting this error API resolved without sending a response for /api/foo, this may result in stalled requests.. can anyone help with why this is happening? I heard that the sending needs to happen at the top level and not within a callback. this makes no sense to me why, since this sounds like it's being suggested that a promise is returned from the handler and the docs don't mention anything about promises needing to be returned.

4 Replies

Unknown User•2y ago

Message Not Public

alanOP•2y ago

thanks. I refactored it to something like that but I guess I'm curious as to why the original version isn't working

Unknown User•2y ago

Message Not Public

alanOP•2y ago

thanks. that's a good point. I used the following for imports:

import type { NextApiResponse } from "next";
import path from "path";
import fs from "fs";

import type { NextApiResponse } from "next";
import path from "path";
import fs from "fs";

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nextjs api handler issues error about not sending a response when response sent. wai?