Next.js Error Monitoring with AI — DeepTracer | Free Plan Available
Next.js Monitoring

Next.js monitoring
that actually
explains the errors.

DeepTracer's AI agent watches your app 24/7 — catches crashes in API routes, Server Components, and edge functions, then writes a plain-English investigation with the exact fix. Not just a stack trace.

Compatible with
Next.js 14 Next.js 15 App Router Pages Router Edge Runtime Vercel
DeepTracer — Investigation Live
my-app.vercel.app / app / checkout / page.tsx 500
Error Detected
TypeError: Cannot read properties of null
reading 'id' at app/checkout/page.tsx:47
0
occurrences
100%
fail rate
3m ago
first seen
Scanning logs, traces & deploys
14:23:01 Reading app/checkout/page.tsx
14:23:02 Tracing getServerSession() call chain
14:23:02 Correlating with deploy at 14:18:44
14:23:03 ✓ Root cause identified
0%
Root Cause Found 2.3s
Root Cause

session is null when users navigate directly to /checkout without a valid cookie. Your page accesses session.user.id on line 47 without a null check — started failing after auth middleware was removed in the 14:18 deploy.

Fix — app/checkout/page.tsx
app/checkout/page.tsx @@ -45,6 +45,7 @@
export default async function CheckoutPage() {
const session = await getServerSession()
- const userId = session.user.id
+ if (!session) redirect('/login')
+ const userId = session.user.id
Full Coverage

Every way Next.js can fail.
Caught and explained.

DeepTracer watches every layer of your app — not just uncaught exceptions. When something breaks, you get the plain-English reason and the exact line to fix.

API Routes Monitoring
POST /api/payments/create-intent 500
Error: No such customer: 'cus_undefined'
at app/api/payments/route.ts:31
DeepTracer found

customerId is undefined because req.headers.get('x-user-id') returns null — the header name was changed to x-uid in your 3:47pm frontend deploy but the API handler wasn't updated.

✓ Investigated in 1.8s
Server Components Monitoring
RSC app/dashboard/page.tsx crashed
TypeError: Cannot destructure 'user' of null
at app/dashboard/page.tsx:12
DeepTracer found

Next.js ISR is regenerating this page server-side with no active sessiongetServerSession() returns null during background revalidation. Add export const dynamic = 'force-dynamic' to prevent cached renders without a session.

✓ Investigated in 2.1s
Edge & Middleware Monitoring
EDGE middleware.ts all routes ↯
Error: crypto is not defined
at middleware.ts:8 — 47 routes affected
DeepTracer found

Your middleware imports bcrypt which uses Node.js crypto — unavailable on Edge Runtime. This is blocking every route on your app. Replace with jose for JWT operations or move auth checks to a regular API route.

✓ Investigated in 1.4s
Server Actions Monitoring
ACTION submitContactForm unhandled
PrismaClientKnownRequestError: P2002
Unique constraint failed on field 'email'
DeepTracer found

No try/catch in submitContactForm — Next.js converts this into a generic "Something went wrong" users see with no context. Wrap in try/catch and return { error: 'Email already registered' } for a specific message.

✓ Investigated in 2.6s
Setup

Two ways to add DeepTracer.
Both take under 5 minutes.

Start with the Vercel Log Drain for instant coverage — no code changes at all. Or install the SDK for full-depth telemetry including API traces and LLM costs.

★ Easiest Vercel Log Drain
0 lines of code

No SDK. No code changes. Connect your Vercel project in settings and DeepTracer starts receiving every log, error, and edge function crash instantly.

All Next.js logs & errors captured
Edge function & middleware failures
Build errors & deployment issues
Works on any framework deployed to Vercel
1 Create a project in DeepTracer and copy your drain URL
2 Open Vercel → your project → Settings → Log Drains
3 Paste the URL, select all event types, click Save
vercel.com / my-app / settings
General
Domains
Integrations
Environment
Log Drains
Security
Drain URL
https://ingest.deeptracer.dev/drain/v1/dt_a8f2…
Save
Event Types
Lambda (Serverless)
Edge
Build
Static
Drain active — receiving logs
Soon One-click install directly from the Vercel Integration Marketplace — no manual URL copy needed
Full Depth API traces · LLM costs · custom events
5 lines of code

Deeper telemetry. The SDK adds request traces, LLM usage tracking, custom events, and distributed tracing on top of everything the drain provides.

Everything in the Log Drain
Per-request API traces & latency
LLM cost tracking (OpenAI, Anthropic, etc.)
Custom events & user context
$ npm install @deeptracer/nextjs
instrumentation.ts layout.tsx
TypeScript
1// Next.js 14+ — App Router
2import 'server-only'
3import { DeepTracer } from '@deeptracer/nextjs'
 
5export function register() {
6  DeepTracer.init({
7    key: process.env.DEEPTRACER_KEY,
8  })
9}
@deeptracer/nextjs @deeptracer/ai @deeptracer/react App Router ✓ Pages Router ✓
Why not just Vercel logs?

Same error. Two very different experiences.

Vercel logs show you something broke. DeepTracer tells you why, which deploy caused it, and exactly what to change.

Raw · Expiring
14:23:01.442 Function POST /api/payments/create-intent
14:23:01.443 Function Starting execution...
14:23:01.451 Error Error: No such customer: 'cus_undefined'
14:23:01.451 Function at Stripe.makeRequest (/var/task/node_modules/stripe/lib/…
14:23:01.452 Function at processTicksAndRejections (node:internal/process/ta…
14:23:01.452 Error Unhandled rejection. Status: 500
14:23:03.112 Function POST /api/payments/create-intent
14:23:05.884 Error Error: No such customer: 'cus_undefined'
⚠ These logs will expire in 53 minutes
No root cause — just a stack trace
No deployment correlation
Logs gone in 1 hour
Same error repeated 47 times — no grouping
Investigated · 7-day retention
Error: No such customer: 'cus_undefined'
47 occurrences · 100% fail rate First: 14:23 · Last: 14:31 app/api/payments/route.ts:31
Root Cause — investigated in 1.8s

customerId is undefined because req.headers.get('x-user-id') returns null. The header name changed to x-uid in the 14:18 frontend deploy — the API handler wasn't updated to match.

🔗 Deploy correlation 0 errors before 14:18 · 47 after
Plain-English root cause — no guessing
Deploy correlation — pinpointed to 14:18
7-day retention — not gone in an hour
Grouped errors — 47 occurrences, one card

Vercel logs are raw output. DeepTracer is the explanation.  ·  Start free — see the difference in 5 minutes →

Pricing

Start free. Upgrade when your
app needs a guardian.

One flat price per workspace. No per-host fees, no event overage surprises, no sales call. Cancel any time.

Monthly Annual Save 15%
Reactive Mode
$ 0 /mo

Your agent sleeps until you wake it up. Perfect for side projects getting started.

Get Started — Free Forever
1 project 1
Events / month 25K
AI investigations 3 / mo
AI chat messages 10 / mo
Data retention 1 day
Email alerts
Vercel Log Drain
24/7 ambient monitoring
Slack alerts
Team seats
No credit card required
Guardian Mode Most Popular
$ 19 /mo

Your agent never sleeps. Monitors 24/7, investigates automatically, alerts you before users notice.

Start Free Trial — 14 Days
Projects Unlimited
Events / project / month 2M
AI investigations Unlimited
AI chat Unlimited
Data retention 7 days
Error retention 30 days
24/7 ambient monitoring
Slack alerts
Team seats 5
Billed monthly · cancel any time
DeepTracer $19/mo vs Sentry $26/mo vs Helicone $79/mo vs Datadog (ask sales)

Event overages billed at $0.50 / 100K — we never cut off your monitoring. Full pricing details →

FAQ

Questions about Next.js monitoring

Does this work with Next.js 15 and the App Router?
Yes — full support for Next.js 13, 14, and 15, both App Router and Pages Router. The SDK uses the instrumentation.ts hook (stable in Next.js 14.1+) for zero-config setup. Edge Runtime, Middleware, Server Components, Server Actions, and Route Handlers are all covered.
Will the SDK slow down my Next.js app?
No measurable impact. All event writes are async and non-blocking — your request handlers return immediately and the SDK flushes data in the background. The package is under 3KB gzip. If DeepTracer's ingestion endpoint is unreachable, events are silently dropped — your app never crashes or slows because of monitoring.
What's the difference between the Vercel Log Drain and the SDK?
The Vercel Log Drain requires zero code changes — it forwards all your app's stdout/stderr logs and function errors to DeepTracer via Vercel's infrastructure. You get error grouping, AI investigations, and retention immediately.

The SDK adds structured telemetry on top: per-request traces with timing, LLM cost tracking (OpenAI, Anthropic), custom events with user context, and richer metadata. Use the drain to start instantly, add the SDK when you want full depth.
What counts as an event?
Each log line, error occurrence, trace span, or LLM call counts as one event. A typical Next.js app with moderate traffic generates 10K–50K events/month. The free tier covers most side projects. On Pro, the 2M limit per project is enough for a production app serving thousands of daily users.
What happens when I exceed the free tier limit?
We never cut off your monitoring. If you exceed 25K events on the free tier, your agent keeps watching and we'll notify you. Overages on Pro are billed at $0.50 per 100K events — most apps never hit this. We'll always warn you before charging overage fees.
Can I use DeepTracer alongside Sentry?
Yes — they're complementary. Sentry is great for error grouping and release tracking with a large ecosystem. DeepTracer adds AI investigation (plain-English root cause, not just a stack trace), LLM cost monitoring, and ambient 24/7 health checks that Sentry doesn't do. Many teams run both, at least during evaluation.
Get started free

Your Next.js app is live.
Is anyone watching it?

Add DeepTracer in under 5 minutes. Connect your Vercel project or install the SDK — your AI agent starts monitoring immediately. Free forever. No credit card.

Free forever plan No credit card required 5-minute setup Cancel Pro any time