Node.js: TypeError: Cannot read properties of undefined (reading 'x')
TypeError: Cannot read properties of undefined (reading 'name')
at Object.<anonymous> (/app/index.js:5:13)
at Module._compile (node:internal/modules/cjs/loader:1256:14)
Immediate Remediation
javascript
Use optional chaining: `const name = user?.profile?.name;` or add a null check before accessing the property.
Root Cause Analysis
The code attempted to access a property on an undefined value, usually because an API response, function argument, or object property was missing or not initialized.
Verification & Guardrails
- Check if the value is actually undefined vs null; optional chaining handles both.
- Verify the data source (e.g., API response) actually contains the expected fields.
- Use defensive programming for external inputs.
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