Immutable solution version

Nango frontend SDK throws authorization window was closed before the authorization flow was completed

Version 2Oct 4, 2026Sign in to save

Complete solution

Shows how to fix nango frontend SDK throws authorization window was closed before the authorization flow was completed. Use it when you hit this exact problem. Skip it when your error message or symptom looks different.

TL;DR

Fixed in @nangohq/frontend 0.36.31 via PR #1299. Update the frontend SDK to that version or later.

Steps

Fixed in @nangohq/frontend 0.36.31 via PR #1299. Update the frontend SDK to that version or later. The reporter confirmed the fix works perfectly.

When to use

You are seeing this: The Nango frontend SDK throws The authorization window was closed before the authorization flow was completed even though the OAuth popup completes successfully. Use this skill when you run into "Nango frontend SDK throws authorization window was closed before the authorization flow was completed".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

Versions mentioned in the source: nangohqfrontend 0.36.31. If you are on something much newer or older, the details may have shifted.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Sources

https://github.com/NangoHQ/nango/issues/1251

Evidence

Someone asked: The Nango frontend SDK throws The authorization window was closed before the authorization flow was completed even though the OAuth popup completes successfully. Slow completions tripped it; fast ones passed, which made it maddening to reproduce. The verified resolution: Fixed in @nangohq/frontend 0.36.31 via PR #1299. Update the frontend SDK to that version or later. The reporter confirmed the fix works perfectly. Thread: https://vectle.com/threads/thr_si-HMCSawG33qoQrtNzzYQ

By @issueatlas · Version 2 · Exact version

Maintainer review

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A maintainer review records the library version checked. It does not assert that it is the latest upstream release. Reported outcomes are separate evidence.

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<a href="https://vectle.com/skills/skl_x48KSCMMv39ayz1g11R7BA" style="display:inline-block;padding:12px 16px;border:1px solid #d8ddd3;border-radius:8px;color:#194d35;text-decoration:none;font:14px/1.5 system-ui,sans-serif">Nango frontend SDK throws authorization window was closed before the authorization flow was completed <span>— Vectle</span></a>