2nd/10_Wiki/Topic_JavaScript/JavaScript_Error_Object.md

id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit

id	title	category	status	verification_status	canonical_id	aliases	duplicate_of	source_trust_level	confidence_score	created_at	updated_at	review_reason	merge_history	tags	raw_sources	applied_in	github_commit
javascript-error-object	JavaScript Error Object	Frontend	draft	conceptual		Error object error reference err.name err.message error names		B	0.87	2026-06-23	2026-06-23			javascript js web frontend w3schools errors error-object	https://www.w3schools.com/js/js_error_object.asp

JavaScript Error Object

🎯 한 줄 통찰 (One-line insight)

JavaScript's built-in Error object carries information when an error occurs, exposing useful properties such as name and message, with name returning one of six standard error types. [S1]

🧠 핵심 개념 (Core concepts)

• The Error object is built in and provides information when errors occur, with useful properties like name and message. [S1]
• Error.isError(x) returns true if a value is an Error. [S1]
• Six error names — the name property can return EvalError, RangeError, ReferenceError, SyntaxError, TypeError, or URIError. [S1]
• EvalError is deprecated — use SyntaxError instead. [S1]
• Avoid non-standard members — several properties and methods are browser-specific or outdated and should not be used. [S1]

🧩 추출된 패턴 (Extracted patterns)

• Read name to branch on error type — the standardized set of six error names lets handling code distinguish what went wrong. [S1]
• Stick to standard members — rely on name, message, and cause; avoid deprecated/non-standard properties and methods. [S1]

📖 세부 내용 (Details)

The Error Object JavaScript includes a built-in error object providing information when errors occur, with useful properties like name and message. [S1]

Error Object Methods & Properties [S1]

Property / Method	Description
new Error()	Creates a new Error object
name	Sets or returns an error name
message	Sets or returns an error message
cause	Sets or returns an error cause
Error.isError(x)	Returns true if a value (x) is an Error

Error Names The name property can return one of six error types: [S1]

Error Name	Description
EvalError	Deprecated - use SyntaxError instead
RangeError	A number "out of range" has occurred
ReferenceError	An illegal reference has occurred
SyntaxError	A syntax error has occurred
TypeError	A type error has occurred
URIError	An error in encodeURI() has occurred

Each error name has an associated "Try it" button linking to examples. No inline code examples are displayed on this reference page. [S1]

Non-Standard Properties and Methods The page warns against using deprecated, browser-specific, or outdated members: [S1]

• Properties: arguments, caller, columnNumber, description, displayName, fileName, lineNumber, number, stack
• Methods: evalError(), internalError(), toSource()

🛠️ 적용 사례 (Applied in summary)

This is a reference page; the source displays no inline code examples (only "Try it" links). The applicable usage is reading err.name / err.message inside a catch block, as shown on the related Error Statements page. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

Not found in source as displayed inline code; the reference page exposes only the property/method and error-name tables above and links to external "Try it" examples. The canonical access pattern (drawn from the same family of pages) is reading the standard properties:

try {
  // ...
} catch(err) {
  let name = err.name;       // e.g. "TypeError"
  let message = err.message; // human-readable description
}

⚖️ 모순 및 업데이트 (Contradictions & updates)

• EvalError deprecation — the source marks EvalError as deprecated in favor of SyntaxError. [S1]
• Non-standard members — listed properties/methods are flagged as browser-specific or outdated and should be avoided. [S1]

✅ 검증 상태 및 신뢰도

• 상태: draft
• 검증 단계: conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
• 출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
• 신뢰 점수: 0.87
• 중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

• 상위/루트: JavaScript Tutorial
• 관련 개념: JavaScript Errors Intro, JavaScript Error Statements, JavaScript Silent Errors, JavaScript Debugging
• 참조 맥락: The reference for the object received in a catch block and the standardized error names used to identify failures.

📚 출처 (Sources)

• [S1] W3Schools — JavaScript Error Object — https://www.w3schools.com/js/js_error_object.asp

📝 변경 이력 (Change history)

• 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Error Object" page (Astra wiki-curation, P-Reinforce v3.1 format).