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LIVE DEMO

You are looking at Acme Storefront, a fictional shop we generate traffic for. The numbers are real rows in our database and the insights below were written by the same engine that runs on customer projects - nothing here is a mockup.

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Errors - last 7 days

Every JavaScript exception and unhandled promise rejection in the demo storefront's generated traffic, grouped by message exactly as they are for a customer project. Betterloop ranks these by how many sessions they hit, not by raw volume - one error in 40 sessions matters more than 400 hits from one bot.

3 distinct errors / 64 occurrences - click a row for the stack trace

Cannot read properties of undefined (reading 'zip')35x / 23 sessions

Last seen: 2026-07-29 14:52:30.756+00 on /checkout

TypeError: Cannot read properties of undefined (reading 'zip')
    at validateAddress (checkout.4f2a1c9.js:118:22)
    at handleSubmit (checkout.4f2a1c9.js:204:9)
    at HTMLFormElement.<anonymous> (checkout.4f2a1c9.js:231:5)
Failed to fetch orders: 503 Service Unavailable16x / 11 sessions

Last seen: 2026-07-29 13:30:51.705+00 on /account

TypeError: Failed to fetch
    at loadOrders (account.9b1ef04.js:64:11)
    at async OrdersPanel (account.9b1ef04.js:96:3)
undefined is not an object (evaluating 'p.variants.length')13x / 9 sessions

Last seen: 2026-07-29 14:52:16.87+00 on /products

TypeError: undefined is not an object (evaluating 'p.variants.length')
    at renderCard (catalog.71c0d2.js:88:15)
    at ProductGrid (catalog.71c0d2.js:141:7)

The engine already turned the worst of these into ranked fixes on the Insights tab, with the affected page and session count attached.

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