Error Handling & Debugging — Free JavaScript Tutorial
Learn Error Handling & Debugging in JavaScript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Error Handling & Debugging in JavaScript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Error Handling & Debugging in JavaScript
`try { ... } catch(err) { ... } finally { ... }` — try runs, catch handles errors, finally always runs (cleanup).
Error properties: `err.name` (type), `err.message` (description), `err.stack` (trace).
Custom errors: `throw new Error("message")`. Or custom class: `class ValidationError extends Error { ... }`.
Common error types: `TypeError` (wrong type), `ReferenceError` (undefined variable), `SyntaxError` (invalid code), `RangeError` (out of range).
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