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DevAudit is the command center for your engineering work. It watches every push, catches every error, and turns each failure into a written post-mortem with a fix you can apply.

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storefront

All projects

storefront

acme/storefront

main
acme/storefront
storefrontPublic
Autosave onManage
api
checkout.ts
session.ts
lib
cart.ts
package.json
README.md
api/checkout.tsRun Code
45async function checkout(cart: Cart) {
46 const total = sum(cart.items);
47 const item = cart.items[0];
48 return charge(item.id, cart.total);
49}
50
51export default checkout;
typescriptLn 48, Col 36Saved locally 20:28
Analyze & Fix with AI [3]
SeverityErrorLocation
CriticalTypeError: Cannot read 'id' of undefinedapi/checkout.ts:48
TypeError: Cannot read 'id' of undefined
    at checkout (api/checkout.ts:48:21)
WarningUnhandled promise rejection: 401 /sessionauth/session.ts:12
WarningRangeError: Invalid array lengthlib/cart.ts:90

storefront

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Last syncedNot yet this sessionAutosave is onLast syncedJust nowAutosave is on

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New chatWhy does checkout crash for guests?

What can I help you build?

Ask about api/checkout.ts, paste an error, attach a screenshot or share a link.

Explain checkout.tsExplain what api/checkout.ts does, step by step.Find bugsRead api/checkout.ts and list any bugs or mistakes, most serious first.Write testsWrite tests for api/checkout.ts using describe / it / expect.Make it cleanerRefactor api/checkout.ts to be easier to read.
Why does checkout crash for guests?
Guest session expires mid-checkout,so cart.items[0] is undefined at :48.

Suggested changes to 1 file

api/checkout.ts3 lines · preview
Apply 1 file changeApplied to your project
CopyRegenerateJust now
Ask anything about api/checkout.ts…Why does checkout crash for guests?
Send

The assistant can make mistakes. Suggested file changes are only applied when you press Apply.

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Every screen your team uses, from the first push to the finished autopsy.

npm install devaudit-cli

$ devaudit --help

login [options]Log in via your browser (default), or with an API token.
initDetect your stack and generate a devaudit.config.json in the current repo.
listList repos connected to your account.
errors [options]List recent errors across your connected repos.
status [options]Summarize connected repos and open errors.
fix <errorId>Apply the AI-suggested fix for an error as a commit on a new branch.
npm install devaudit-cli

$ devaudit errors

b82e4d10 northwind/web app/checkout/page.tsx:48 TypeError: Cannot read properties of undefined (reading 'id')
3f9a1c07 northwind/web src/lib/session.ts:112 UnhandledPromiseRejection: 401 from /api/session
5c07ea93 northwind/worker jobs/invoice.ts:203 Error: connect ETIMEDOUT 10.0.4.17:5432
91d2b6f4 northwind/web components/Cart.tsx:77 ReferenceError: price is not defined
e07a38bc northwind/api routes/webhooks.ts:31 SyntaxError: Unexpected token < in JSON at position 0
0d6c51aa northwind/worker jobs/export.ts:59 RangeError: Maximum call stack size exceeded
npm install devaudit-cli

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npm install devaudit-cli

# install

$ npm install devaudit-cli

# sign in through your browser

$ devaudit login

# detect your stack and write devaudit.config.json

$ devaudit init

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$ devaudit errors

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$ devaudit fix <errorId>

npm install devaudit-cli

$ devaudit fix b82e4d10

Working on a fix — this can take a moment if the AI has to write it...

✓ Committed to devaudit/fix-b82e4d10

AI fix: cart.items[0] is undefined when a guest cart expires mid-checkout. Added a guard before charge().

Commit: 7c2e91d4a8f03b65e1d9c4a72b0f58e36d1a94cb

View: https://github.com/northwind/web/commit/7c2e91d4a8f03b65e1d9c4a72b0f58e36d1a94cb

Open a pull request from that branch when you're ready to merge it.

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Everything your team needs to stop repeating bugs.

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Live

$ devaudit watch --repo acme/storefront

09:14:02pushmain ← a3f9c1e “refactor checkout”
09:14:44okbuild passed in 42s
09:16:10errTypeError: Cannot read 'id' of undefined
09:16:11notegrouped with 131 similar events
09:21:03pushfeat/auth ← 91bd07a “add refresh flow”

Every push, watched automatically

DevAudit connects to your repo once, then tails every push and deploy — no dashboards to babysit.

AI Quick-Fix · api/checkout.ts:47

-return charge(item.id, cart.total);
+if (!item) throw new CartExpiredError(cart.id);
+return charge(item.id, cart.total);

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Every autopsy ends in a reviewable patch, with the reasoning written next to the line it applies to.

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Live error monitoring

Error rate across every service, trending down since last deploy.

checkout-api18ms
auth-service9ms
billing-worker31ms
Workflow

From the push to the post-mortem.

Follow one failure from the commit that caused it to the patch that fixes it.

Debugging by hand is a loop you never leave.

You get a vague alert, grep through logs, guess at a cause, patch it, and forget what you learned. The same bug returns three months later under a new name.

DevAudit writes the post-mortem while the error is still fresh. Every failure is tied to its commit, grouped with its twins, and explained, so it only has to teach you once.

  1. 1.A push lands
  2. 2.The error is caught
  3. 3.Context is logged
  4. 4.The cause is diagnosed

A push lands

$ git push origin main

→ a3f9c1e received, 4 files changed

The error is caught

✕ TypeError at api/checkout.ts:48

cart.items[0] is undefined

session sess_8fk2 · guest · eu-west

Context is logged

✓ linked to commit a3f9c1e by @maya

✓ 132 similar events grouped

✓ first seen 6 min after deploy

The cause is diagnosed

◆ Guest carts expire after 15 min.

◆ checkout() never re-checks the cart.

◆ Patch ready: guard + CartExpiredError

$ devaudit fix --apply

DevAudit AI

An engineer that reads every failure.

It reads what you would, and writes down what it finds.

Why does checkout crash for guests?

2 messages · 2m ago

Why does checkout crash for guests?

Guest carts expire after 15 minutes, but checkout() never re-checks the cart. When the session lapses mid-checkout, cart.items[0] is undefined and the next line throws.

  • Only guests hit this, because signed-in carts don't expire.
  • The line that fails is item.id in api/checkout.ts.

Want me to write the fix?

CopyRegenerate2m ago

Ask anything about api/checkout.ts…

Send

The assistant can make mistakes. Suggested file changes are only applied when you press Apply.

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Customers

Teams read fewer stack traces out loud.

What engineering teams say after their first few autopsies.

“We had a checkout bug that came back every few weeks, and every time somebody burned half a day on it. DevAudit lumped all the instances together and pointed at one cause. Fixed it that afternoon. The write-up was already there Monday morning so I didn't have to chase anyone for a post-mortem, which is honestly half the reason we're sticking with it.”

“First thing I open after a bad deploy now. Saves me scrolling through the diff trying to remember what went out.”

“On-call is less miserable. We used to get 40 pages for one dead dependency, now it's a single alert with a count next to it.”

“Honest answer: I didn't want another dashboard. I mostly just read the summaries it writes about the diff. Hotfix reviews go quicker. Can't give you a number.”

“We hired six people this spring and I pointed each of them at our old autopsies in week one. They work out why things are the way they are without pulling a senior person aside every time. I'd guess incident onboarding went from about a month to two weeks, though I haven't measured it properly. Setup took an afternoon, and most of that was us untangling our own repo.”

“It flagged a guest checkout bug in a path we have zero tests for. The patch it suggested is basically what we merged. I renamed a variable.”

“We've got Go, Python and some Ruby nobody wants to touch. Same autopsy format for all of it, which makes triage a lot less annoying.”

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Frequently asked questions

DevAudit stores the errors you report from your repositories (through the CLI or the API), explains the likely cause, and suggests a fix. You can apply a suggested fix as a commit on a new branch. The dashboard also has a code editor, an AI assistant and deployment tools.