API Routes - xxxx has been resolved by the API without sending back a response, potentially causing delays in request processing

While working on my frontend project, I encountered an issue with a simple API call using API routes. Whenever I try to complete the call, I face the following error which prevents my redirect from working:

API resolved without sending a response for /api/uploadLog, this may result in stalled requests.

Despite going through solutions provided by other developers, I am still unable to resolve the issue and feel like I might be missing something critical in the underlying process.

The non-working code snippet is as follows:

    export default function handler(req: NextApiRequest, res: NextApiResponse) {
    fs.readdir('./src/data/logs', (err, files) => {
        if (!err) {
            const logNumber = files.length;
            fs.writeFileSync(`./src/data/logs/log${logNumber}.txt`, req.body);
            res.status(200).json({ message: `log${logNumber}` });
        } else {
            res.status(500).json({ message: err });
        }
    });
};

However, the following code does work:

export default function handler(req: NextApiRequest, res: NextApiResponse) {
    fs.readdir('./src/data/logs', (err, files) => {
        if (!err) {
            const logNumber = files.length;
            fs.writeFileSync(`./src/data/logs/log${logNumber}.txt`, req.body);
        } else {
            res.status(500).json({ message: err });
        }
    });
    res.status(200).json({ message: `Hello World!` });
};

Unfortunately, I cannot use the successful approach because I need to address the readdir first.

I would greatly appreciate any assistance or insights into this matter.

Answer №1

readdir is an asynchronous function. Therefore, in your first example, you are calling readdir without waiting for the promise to resolve, which means it is a fire and forget scenario.

Consider using readdirSync instead.

Check out this link to learn more about Node.js fs.readdir method.

Also, here is a resource on Node.js fs.readdirSync method.

In your second example, the issue is that you are resolving because you call res.status(200).json({... outside of your callback function.

You can try implementing something like this:

import fs from 'fs';

export default function handler(req, res) {
  try{
    const files = fs.readdirSync('./src/data/logs');

    const logNumber = files.length;
    fs.writeFileSync(`./src/data/logs/log${logNumber}.txt`, req.body || '');
    return res.status(200).json({ message: `log${logNumber}` });
  } catch(e){
    return res.status(500).json({ message: e.message });
  }
}

Answer №2

After some tweaking, I managed to resolve the issue by switching the readdir function to readdirSync and ensuring the call is asynchronous. The problem of stalling has been resolved, and the correct response is now being returned. Here's the updated code snippet:

export default async function handler(req: NextApiRequest, res: NextApiResponse) {
    try {
        const logs = fs.readdirSync('./src/data/logs').length;
        fs.writeFileSync(`./src/data/logs/log${logNumber}.txt`, req.body);
        res.status(200).json({ message: `log${logNumber}` });
    } catch (err) {
        res.status(500).json({ message: err });
    }
}

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