Firebase Functions errorFirebase Cloud Functions: function timed out

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Why the function times out, and the fix

1. 01

   The function never signals that it finished

   “Terminate HTTP functions with res.redirect(), res.send(), or res.end().” Firebase, Sync, async, and promises

   An event function that doesn’t return its promise, or an HTTP function that never sends a response, runs until the timeout. Return the promise, and end every path with res.send() or res.end().

2. 02

   The work is slower than the timeout

   “HTTP and callable functions: 3600 seconds (60 minutes) Scheduled/Task queue functions: 1800 seconds (30 minutes) Other event-driven functions: 540 seconds (9 minutes)” Firebase, Manage functions (Set timeout and memory allocation)

   AI calls, file processing and large exports can take minutes. Raise timeoutSeconds within the maximum for its type. The sample is 2nd gen; on 1st gen use runWith({ timeoutSeconds: 540 }) at most.

   const { onRequest } = require('firebase-functions/v2/https');
   
   exports.report = onRequest({ timeoutSeconds: 300, memory: '1GiB' }, async (req, res) => {
     const data = await buildReport();
     res.json(data);
   });

3. 03

   The callable client gives up first

   “For HTTP callable functions, the client SDKs enforce a separate default request timeout of 70 seconds (or 60 seconds on Flutter).” Firebase, Manage functions

   The client SDKs stop waiting after 70 seconds, or 60 on Flutter, even when the server timeout is longer. The app then shows deadline-exceeded. Set the client timeout to match, for example httpsCallable(functions, name, { timeout: 300000 }) on the web.

4. 04

   An outside API hangs

   A fetch with no timeout waits as long as the function lets it. Give outside calls their own timeout, catch the error, and return a clear message instead of hanging.

Checked against the vendor’s docs on November 9, 2026: Firebase docs: Manage functions; Firebase docs: Quotas and limits; Firebase docs: Sync, async, and promises.

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