Vue Debug Guides

Vue 3 debugging and error handling for runtime issues, warnings, async failures, and hydration bugs. For development best practices and common gotchas, use vue-best-practices.

Reactivity

• Tracing unexpected re-renders and state updates → See reactivity-debugging-hooks
• Ref values not updating due to missing .value access → See ref-value-access
• State stops updating after destructuring reactive objects → See reactive-destructuring
• Refs inside arrays, Maps, or Sets not unwrapping → See refs-in-collections-need-value
• Nested refs rendering as [object Object] in templates → See template-ref-unwrapping-top-level
• Reactive proxy identity comparisons always return false → See reactivity-proxy-identity-hazard
• Third-party instances breaking when proxied → See reactivity-markraw-for-non-reactive
• Watchers only firing once per tick unexpectedly → See reactivity-same-tick-batching

Computed

• Computed getter triggers mutations or requests unexpectedly → See computed-no-side-effects
• Mutating computed values causes changes to disappear → See computed-return-value-readonly
• Computed value never updates after conditional logic → See computed-conditional-dependencies
• Sorting or reversing arrays breaks original state → See computed-array-mutation
• Passing parameters to computed properties fails → See computed-no-parameters