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+---
+title: Keep Running in the Background
+description: "Learn how to ask for background permission with Puter.js, so your app keeps reacting to changes after the user closes it."
+tags: [perms, events, auth]
+order: 17
+---
+
+<div class="info">The Events API is in beta. Event shapes, limits, and behavior may change between releases.</div>
+
+A subscription made with [`puter.events.onLocal()`](/Events/onLocal/) ends when
+the page does. That's fine while the user is looking at your app, but some
+features need to keep going after they close the tab — tagging a file the moment
+it's saved, or sending something on when a folder changes.
+
+Puter can keep watching for you, but running your code while the user isn't
+there needs their permission first. This recipe sets that up.
+
+## Ask for background permission
+
+Background delivery has its own per-app permission, `events:background`. Ask for
+it with [`puter.perms.request()`](/Perms/request/), the same way you'd ask for a
+folder or the user's email:
+
+```js
+await puter.perms.request(['events:background']);
+```
+
+Check first with [`puter.perms.check()`](/Perms/check/) so you only prompt the
+user when you actually need to:
+
+```js
+if (!await puter.perms.check('events:background')) {
+    await puter.perms.request(['events:background']);
+}
+```
+
+Without it, subscribing in the background fails with
+`events_background_consent_required`.
+
+## Publish the code that runs
+
+A background subscription doesn't run a function from your page — your page is
+gone. It runs a **handler** you published ahead of time, under a name:
+
+```js
+await puter.events.handlers.publish('tagUpload', async ({ event, ctx }) => {
+    await user.fs.write(`${ctx.logDir}/${event.uid}.json`, JSON.stringify({
+        path: event.path,
+        at: event.ts,
+    }));
+});
+```
+
+Two things are different from an ordinary callback:
+
+**It can't use variables from around it.** The handler is turned into text and
+run somewhere else later, so nothing surrounding it comes along. Everything it
+uses has to be a parameter, something it declares itself, a standard global, or
+reached through `ctx`. Pass values in with `context` when you subscribe. The SDK
+checks this before sending and rejects with `events_handler_free_variable`,
+naming the identifier it couldn't resolve.
+
+**`puter` isn't available.** Use the `user` binding instead, which has the same
+access your app has for that user in a tab.
+
+## Subscribe
+
+Now bind a subscription to the handler by name with
+[`puter.events.onPersistent()`](/Events/onPersistent/):
+
+```js
+await puter.events.onPersistent({
+    subject: 'fs:~/Documents/uploads',
+    handlerName: 'tagUpload',
+    context: { logDir: '~/AppData/uploads-log' },
+});
+```
+
+The subject grammar is the same one
+[`onLocal()`](/Events/onLocal/#subjects) uses. `context` is the frozen `ctx` the
+handler receives — up to 4 KB once serialized, so pass ids and paths rather than
+data.
+
+This subscription is stored on the account. It keeps matching while your app is
+closed, and it survives the user signing out and back in.
+
+## Handle the permission being taken away
+
+The user can withdraw `events:background` wherever they manage your app's
+access. When they do, every background subscription your app holds for them is
+suspended with `permission_revoked`.
+
+Granting it again does **not** resume them. You have to subscribe again.
+
+A suspended subscription is still *listed*, so "do I already have one?" isn't
+enough to go on — check that the one you find is still running:
+
+```js
+async function ensureWatching() {
+    if (!await puter.perms.check('events:background')) return false;
+
+    const subs = await puter.events.list();
+    const mine = subs.find(s => s.handlerName === 'tagUpload');
+
+    if (mine && !mine.suspendedAt) return true;
+    if (mine) await mine.off();          // suspended, and it won't come back
+
+    await puter.events.onPersistent({
+        subject: 'fs:~/Documents/uploads',
+        handlerName: 'tagUpload',
+        context: { logDir: '~/AppData/uploads-log' },
+    });
+    return true;
+}
+```
+
+Call this when your app starts. It costs one listing when nothing has changed,
+and it recovers from a revoke-and-grant without the user doing anything else.
+
+`suspendedReason` tells you why, if you want to say something different for each:
+`permission_revoked` is this case, `handler_not_found` means the handler was
+removed, and `failures` means it errored too many times.
+
+## Notes
+
+- A subscription that only needs deliveries while your app is open needs no
+  consent at all. Pass `targets: ['socket']`, or just use
+  [`onLocal()`](/Events/onLocal/).
+- Publishing the same handler source again does nothing. Publishing different
+  source updates it, and `publish()` tells you which happened in `outcome`.
+- Background handlers run as a worker session for your app, which the user sees
+  in their sessions list. Revoking that session, uninstalling the app or
+  deleting it all stop background deliveries.
+- To ask for `events:background` alongside other permissions in one prompt, see
+  [Ask for Access to Multiple Resources](/recipes/ask-for-access-to-multiple-resources/).