Last updated: November 10, 2026
Is Bun down? User reports show no current problems with Bun
Bun is an all-in-one JavaScript toolkit with a fast runtime, package manager, bundler, and test runner. It aims to replace several Node.js tools with one quick binary.
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Bun outage history
Our latest check and the live report status for Bun.
✓ Our latest check (8 November 2026, 3:30 AM PKT): bun.com answered normally in 108 ms.
Good news. Bun has no reported problems right now. If it is not working for you, report it above and your report will appear here.
Bun uptime and reports
Live report counts and the day by day record for the last 30 days.
User reports received in each period.
Last 30 days, day by day: 11 October 2026 to 9 November 2026
Green: up. Red: outage. Amber: some checks failed. Grey: no record yet.
The daily record builds from today as our checks run. Grey days have no saved record yet. A red day marks a confirmed outage.
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Bun on social media
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Posts on Bluesky saying Bun is down. Checked 8 November 2026, 1:01 PM PKT.
Quiet right now. Nobody on Bluesky is saying Bun is down.
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Is Bun Down Right Now?
No. Bun is not down right now. Bun is a JavaScript runtime that runs on your own machine. Crashes and install failures usually come from your system, your packages, or a version gap rather than a Bun outage.
This page tracks the Bun status problems developers report most. Use it to work out whether you face a known Bun issue, a package that expects Node.js, or a local setup mistake.
Is Bun Down for Me or Everyone?
Bun has no central server your code depends on at runtime. When a project fails, ask a sharper question: does plain Node.js run this same project cleanly? If Node fails too, the bug is in the project. Football fans run a cruder split on the Bundesliga app, blaming their stream before the league servers.
If Node works and Bun fails, you have a real compatibility case. Note your Bun version, since fixes land fast and a bug from two releases ago may already be gone.
Why Does Bun Install Fail on Windows?
The Windows installer runs through PowerShell, and strict execution policies can stop it cold. Antivirus tools also flag the Bun binary, since a fast new executable looks suspicious to them.
Bun on Windows is younger than the Mac and Linux builds. Most installs now work natively, but odd failures still appear. Adding an antivirus exception for the Bun folder clears many of them.
Why Is a Package Incompatible With Bun?
Bun covers most of the Node.js API, but not every corner. Packages that lean on rare Node internals or native add-ons can break. The error usually names the missing API or module.
Postinstall scripts are another trap. Bun blocks dependency lifecycle scripts by default for safety. A package that builds itself during install looks broken until you trust it.
Why Does bun install Say a Package Is Missing?
Monorepos trip this up often. Bun workspaces hoist packages to the root, and deep imports that worked by luck under npm can fail. The fix is declaring the dependency in the package that uses it.
A corrupt cache mimics the same error. Clearing the cache and reinstalling fixes it. A stale lockfile after switching branches causes a similar mismatch.
Why Did My Bun Server Crash or Hang?
Watch mode causes many mystery hangs. A file watcher loop restarts the server again and again when generated files land inside the watched folders. The server looks alive but never settles.
Real runtime bugs exist too, since Bun is still young. Test the same code on the latest release before digging deep. Many crash reports close with a fix in the next version.
Common Bun Problems and Fixes
bun command not found after install
The installer adds Bun to a folder inside your home directory, but your shell may not know it yet. Restart the terminal, or add the .bun bin folder to your PATH.
Install blocked by antivirus
Add an exception for the Bun install folder in your antivirus settings. Then run the installer again. False alarms on the binary are a known Windows headache.
Postinstall script did not run
Bun blocks dependency scripts by default. Add the package name to trustedDependencies in your package.json, then reinstall so its build step can run.
Module not found in a monorepo
Declare the package in the workspace member that imports it. Then reinstall from the root so the lockfile records the right layout.
Tests pass in Node but fail in Bun
Compare timer, mock, and environment handling first, since test runners differ in small ways. Isolate one failing test and run it alone under both runtimes.
Having a problem with Bun?
Comments are public and help others understand the issue.
Frequently Asked Questions
Is Bun a drop-in replacement for Node.js?
For most projects, yes. Bun runs Node-style code, reads package.json, and installs from npm. Rare Node APIs and some native add-ons can still break.
Why does Bun block postinstall scripts?
Lifecycle scripts are a known supply-chain attack path. Bun blocks them by default and runs them only for packages you list as trusted.
How do I clear the Bun install cache?
Run bun pm cache rm to empty the global cache. Then install again. This fixes downloads that arrive damaged or stale.
Why is bun not recognized after installing?
Your terminal session predates the PATH change. Open a fresh terminal. If it still fails, add the .bun bin folder to your PATH by hand.
Does Bun work on Windows now?
Yes. Bun ships a native Windows build. It is younger than the Mac and Linux versions, so occasional rough edges remain.
What is the difference between bun install and npm install?
Both install your npm dependencies. Bun does it much faster, uses its own lockfile, and blocks dependency scripts by default for safety.