INCIDENT RUNBOOK

Fix: Edge Runtime Node Crypto Missing in Next.js on AWS Lambda

Comprehensive architectural post-mortem and verified configuration patch for next.js deployed in aws lambda production environments.

Automated Remediation ProtocolUpdated for 2026 Production

Facing edge-runtime-node-crypto-missing in CI/CD or runtime containers?

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● Observed Terminal Error / Stack Trace

Error: Cannot find module 'crypto' from /var/task/node_modules/next/dist/compiled/@edge-runtime/primitives/crypto.js

Root Cause Analysis

The error occurs due to a mismatch between the Node.js version used by Next.js and the version supported by AWS Lambda. Specifically, the Node.js version used by Next.js includes the 'crypto' module, which is not available in the AWS Lambda edge runtime environment. This incompatibility arises because AWS Lambda edge runtime is optimized for performance and only includes a subset of Node.js modules.

● Configuration & Code Resolution

{
  "next.config.js": {
    "target": "serverless",
    "experimental": {
      "runtime": "nodejs16.x"
    }
  },
  "webpack.config.js": {
    "resolve": {
      "fallback": {
        "crypto": false
      }
    }
  }
}

Verification & Build Command

npm run build && npm run deploy && aws lambda invoke --function-name your-lambda-function response.json