Cursor AI Indexing Stuck? How to Fix the Infinite Loading Loop

I opened a fairly average-sized Next.js project in Cursor a few weeks back, and the bottom-right corner just sat there saying "Indexing…" for over 40 minutes. No progress percentage moving, no error, nothing. I closed the app, reopened it, tried a different project entirely — same thing. If you landed here searching for cursor ai indexing stuck, you're probably staring at that exact same frozen progress bar right now, unable to use @codebase or get proper context-aware answers because the index behind it never finishes.

I went through this on two separate machines before I actually understood what was going on, so here's everything that's actually worth trying, in the order I'd try them myself.

Why Cursor AI Indexing Gets Stuck in the First Place

Cursor's codebase indexing isn't a simple file scan. Under the hood, it reads through your project, breaks files into chunks, generates embeddings for each one, and uploads those to build a semantic map it uses whenever you type @codebase or ask a question about your project. That's a lot of moving parts, and if any single step chokes, the UI doesn't throw a clean error — it just leaves the progress bar frozen instead of failing loudly.

In my experience, it almost always comes down to one of these:

• Your project has way more files than it should. A fresh create-next-app project with node_modules installed easily has 30,000+ files once you count every dependency. Cursor is trying to embed all of that unless you've told it not to.
• A single oversized or binary file is choking the pipeline — a huge JSON fixture, a .sqlite file, a bundled .min.js, or a media asset that got committed by accident.
• The local index cache is corrupted, usually from a previous crash or a forced quit mid-index.
• A firewall, VPN, or antivirus is blocking the outbound connection Cursor needs to actually upload chunks and get embeddings back.
• Cursor's backend itself is having a rough moment. This one isn't on you at all, and it happens more than people assume.

Once you know which bucket you're in, the fix is usually fast. Here's how I'd work through it.

Step 1: Check How Many Files You're Actually Trying to Index

Before touching any settings, get a real number. Open Cursor Settings → Indexing & Docs and click View included files. If that list shows tens of thousands of entries for what you know is a mid-sized project, you've found your problem — Cursor is trying to chew through your entire node_modules, build output, and lock files along with your actual source code.

This single check told me everything I needed to know both times I've hit this. A project I expected to have a few hundred relevant files was reporting close to 40,000.

Step 2: Create a .cursorignore File (This Fixes Most Cases)

This is the fix that matters most, and it's also the one most people skip because they assume their .gitignore already covers it. It doesn't automatically — Cursor does respect .gitignore by default, but if you don't have one, or it's incomplete, indexing will happily try to embed dependencies and build artifacts that have zero business being there.

Create a .cursorignore file in your project's root directory. It uses the exact same syntax as .gitignore, so if you've written one before, this will feel familiar:

# Dependencies
node_modules/
.venv/
venv/
vendor/

# Build output
.next/
dist/
build/
out/
target/

# Lock files and generated data
package-lock.json
yarn.lock
pnpm-lock.yaml
*.min.js
*.min.css
*.map

# Large or binary files
*.sqlite
*.db
*.mp4
*.zip

Adjust this list based on what your project actually contains — the general rule is anything you didn't hand-write and don't need Cursor reasoning about should be excluded. According to Cursor's own reference documentation on ignore files, .cursorignore controls what the AI can access entirely, so if you have files you still want to reference manually with @Files while keeping them out of the semantic index, you'd want a separate .cursorindexingignore file instead, since that one only affects indexing and doesn't block direct access.

After saving the file, go back to Cursor Settings → Indexing & Docs and hit Refresh. Watch the included file count — if it drops from tens of thousands down to a few hundred or a couple thousand, the fix worked, and indexing that used to hang indefinitely should now finish in well under a minute.

Step 3: Restart the Window and Force a Clean Re-Index

If your file count already looked reasonable and it's still stuck, the next move is forcing Cursor to throw away whatever job silently failed and start clean.

1. Open the Command Palette with Cmd/Ctrl + Shift + P
2. Run Developer: Reload Window
3. Once it reloads, go to Cursor Settings → Indexing & Docs and click Refresh (or Resync Index if you see that option instead)

This alone resolves the stuck state more often than you'd expect, purely because it forces the indexer to restart from scratch instead of continuing to sit on whatever step it silently failed at.

Step 4: Clear the Local Index Cache

If a reload doesn't move the needle, the local cache itself may be corrupted, usually from a crash or a forced quit that happened mid-index. Close Cursor completely first, then delete the cache folder for your OS:

macOS:

rm -rf ~/Library/Application\ Support/Cursor/Cache/
rm -rf ~/Library/Application\ Support/Cursor/CachedData/

Linux:

rm -rf ~/.config/Cursor/Cache/
rm -rf ~/.config/Cursor/CachedData/

Windows (PowerShell):

Remove-Item -Recurse "$env:APPDATA\Cursor\Cache"
Remove-Item -Recurse "$env:APPDATA\Cursor\CachedData"

Reopen Cursor, load your project, and let it rebuild the index from zero. This is a bit slower than a normal refresh since it's starting completely fresh, but it clears out any corrupted state a simple reload can't touch.

Step 5: Rule Out a Network or Firewall Block

Indexing needs a working outbound HTTPS connection — code chunks get uploaded so Cursor can generate embeddings and send them back. If you're on a work laptop, a corporate VPN, or have strict firewall software running, that connection can get silently blocked without any visible error in Cursor itself.

Try temporarily disabling your VPN or switching to a different network (your phone's hotspot works fine for testing) and see if indexing starts moving. If it does, the fix is adding an exception for Cursor's traffic in your firewall or antivirus settings rather than anything inside Cursor.

Step 6: Toggle Codebase Indexing Off and Back On

Sometimes the indexing service itself just needs a hard reset rather than a refresh. In Cursor Settings → Indexing & Docs, turn off automatic indexing entirely, wait about 30 seconds, then turn it back on. This forces Cursor to treat the project as brand new rather than trying to resume a broken job.

Step 7: Check If It's a Backend Issue, Not Your Setup

Cursor's indexing depends on their backend infrastructure to generate embeddings, and like any cloud service, that occasionally has a bad day. Before spending more time troubleshooting locally, check Cursor's status page for any active incidents. If there's a reported outage, no local fix is going to help until it's resolved on their end — I'd bookmark this page if you use Cursor daily, since it saves a lot of guessing.

What Didn't Work (So You Can Skip It)

• Reinstalling Cursor from scratch — didn't touch the actual cause in my case, since the problem was file count, not the install itself.
• Switching AI models in settings — indexing runs independently of which model you have selected for chat or Composer, so this made zero difference.
• Deleting and re-cloning the same repo repeatedly — if the underlying issue is an oversized file count or a missing .cursorignore, a fresh clone just hits the exact same wall again.

How to Tell the Fix Actually Worked

After applying .cursorignore and refreshing, indexing on a normal-sized project should complete in under a minute. For a genuinely large monorepo, give it a few minutes, but you should see the progress bar actively moving rather than sitting frozen. The clearest confirmation is asking something with @Codebase — if you get a relevant, specific answer instead of a generic or empty response, the index is actually working.

My Honest Take

None of this means Cursor is broken by design — it's doing a lot of background work to make @codebase genuinely useful, and a stuck progress bar with no error message is always going to feel worse than it actually is. In my experience, a missing .cursorignore file explains the vast majority of "stuck indexing" reports, since most projects have way more files sitting in node_modules and build folders than anyone realizes until they actually check. If you've gone through every step here and it's still frozen, it's genuinely worth checking Cursor's status page before assuming your setup is the problem.

Frequently Asked Questions

Why is Cursor AI taking so long to index my codebase?

Usually because it's trying to process far more files than necessary — dependencies in node_modules, build output, and lock files all get included by default unless you've excluded them. A .cursorignore file that removes these typically cuts indexing time from many minutes down to under a minute for most projects.

How do I stop Cursor from indexing large folders like node_modules?

Create a .cursorignore file in your project root and add node_modules/ (along with any other dependency or build folders like .venv/, dist/, or .next/) as separate lines. Cursor treats this file the same way Git treats .gitignore, so once it's saved, refresh the index under Cursor Settings → Indexing & Docs to apply it.

What should I do if Cursor AI is stuck on "starting to index"?

Start by creating a .cursorignore file to exclude node_modules, .venv, and build folders, since an oversized file count is the most common cause. If that doesn't clear it, reload the window with Cmd/Ctrl + Shift + P → Developer: Reload Window, then toggle codebase indexing off and back on in settings. If it's still stuck after that, clear the local index cache and check Cursor's status page for an active outage before assuming it's something on your end.