JavaScript Error Object Complete Reference Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Error objects are arising at runtime errors. The error object also uses as the base object for the exceptions defined by the user. The complete list of JavaScript Error Object properties are listed below: Error types JavaScript RangeError – Invalid dateJavaScript RangeError – Repeat count must be non-negativeJavaScript ReferenceError – Can’t access lexical declaration`variable’ before initializationJavaScript ReferenceError – Invalid assignment left-hand sideJavaScript ReferenceError – Assignment to undeclared variableJavaScript ReferenceError – Reference to undefined property “x”JavaScript ReferenceError – variable is not definedJavaScript ReferenceError Deprecated caller or arguments usageJavaScript SyntaxError – Illegal characterJavaScript SyntaxError – Identifier starts immediately after numeric literalJavaScript SyntaxError – Function statement requires a nameJavaScript SyntaxError – Missing } after function bodyJavaScript SyntaxError – Missing } after property listJavaScript SyntaxError – Missing variable nameJavaScript SyntaxError – Missing ] after element listJavaScript SyntaxError – Invalid regular expression flag “x”JavaScript SyntaxError “variable” is a reserved identifierJavaScript SyntaxError – Missing ‘:’ after property idJavaScript SyntaxError – Missing ) after conditionJavaScript SyntaxError – Missing formal parameterJavaScript SyntaxError – Missing ; before statementJavaScript SyntaxError – Missing = in const declarationJavaScript SyntaxError – Missing name after . operatorJavaScript SyntaxError – Redeclaration of formal parameter “x”JavaScript SyntaxError – Missing ) after argument listJavaScript SyntaxError – Return not in functionJavaScript SyntaxError: Unterminated string literalJavaScript SyntaxError – Applying the ‘delete’ operator to an unqualified name is deprecatedJavaScript SyntaxError – Using //@ to indicate sourceURL pragmas is deprecated. Use //# insteadJavaScript SyntaxError – Malformed formal parameterJavaScript SyntaxError – “0”-prefixed octal literals and octal escape sequences are deprecatedJavaScript SyntaxError – Test for equality (==) mistyped as assignment (=)?JavaScript SyntaxError – “x” is not a legal ECMA-262 octal constantJavaScript TypeError – “X” is not a non-null objectJavaScript TypeError – “X” is not a constructorJavaScript TypeError – “X” has no propertiesJavaScript TypeError – “X” is (not) “Y”JavaScript TypeError – “X” is not a functionJavaScript TypeError – ‘X’ is not iterableJavaScript TypeError – More arguments neededJavaScript TypeError – “X” is read-onlyJavaScript TypeError – Reduce of empty array with no initial valueJavaScript TypeError – Can’t assign to property “X” on “Y”: not an objectJavaScript TypeError – Can’t access property “X” of “Y”JavaScript TypeError – Can’t define property “X”: “Obj” is not extensibleJavaScript TypeError – X.prototype.y called on incompatible typeJavaScript TypeError – Invalid assignment to const “X”JavaScript TypeError – Property “X” is non-configurable and can’t be deletedJavaScript TypeError – Can’t redefine non-configurable property “x”JavaScript TypeError – Variable “x” redeclares argumentJavaScript TypeError – Setting getter-only property “x”JavaScript TypeError – Invalid ‘instanceof’ operand ‘x’JavaScript TypeError – Invalid Array.prototype.sort argumentJavaScript TypeError – Cyclic object valueJavaScript TypeError – Can’t delete non-configurable array elementJavaScript URIError Malformed URI SequenceJavaScript Warning – Date.prototype.toLocaleFormat is deprecatedJavaScript Logging Script Errors Instance properties JavaScript Error message PropertyJavaScript Error name Property Instance Methods JavaScript Error.prototype.toString() Method Comment More infoAdvertise with us S shubhamyadav4 Follow Improve Article Tags : JavaScript Web Technologies JavaScript-Errors Explore JavaScript Tutorial 8 min read JavaScript BasicsIntroduction to JavaScript 4 min read JavaScript Versions 2 min read How to Add JavaScript in HTML Document? 3 min read JavaScript Syntax 6 min read JavaScript Output 4 min read JavaScript Comments 2 min read JS Variables & DatatypesVariables and Datatypes in JavaScript 6 min read Global and Local variables in JavaScript 4 min read JavaScript Let 6 min read JavaScript const 5 min read JavaScript Var Statement 7 min read JS OperatorsJavaScript Operators 5 min read Operator precedence in JavaScript 2 min read JavaScript Arithmetic Operators 5 min read JavaScript Assignment Operators 5 min read JavaScript Comparison Operators 5 min read JavaScript Logical Operators 5 min read JavaScript Bitwise Operators 5 min read JavaScript Ternary Operator 4 min read JavaScript Comma Operator 2 min read JavaScript Unary Operators 4 min read JavaScript in and instanceof operators 3 min read JavaScript String Operators 3 min read JS StatementsJavaScript Statements 4 min read JavaScript if-else 3 min read JavaScript switch Statement 4 min read JavaScript Break Statement 2 min read JavaScript Continue Statement 1 min read JavaScript Return Statement 4 min read JS LoopsJavaScript Loops 3 min read JavaScript For Loop 4 min read JavaScript While Loop 3 min read JavaScript For In Loop 3 min read JavaScript for...of Loop 3 min read JavaScript do...while Loop 4 min read JS Perfomance & DebuggingJavaScript | Performance 4 min read Debugging in JavaScript 4 min read JavaScript Errors Throw and Try to Catch 2 min read JS ObjectObjects in Javascript 4 min read Object Oriented Programming in JavaScript 3 min read JavaScript Objects 6 min read Creating objects in JavaScript 5 min read JavaScript JSON Objects 3 min read JavaScript Object Reference 4 min read JS FunctionFunctions in JavaScript 4 min read How to write a function in JavaScript ? 4 min read JavaScript Function Call 2 min read Different ways of writing functions in JavaScript 3 min read Difference between Methods and Functions in JavaScript 3 min read Explain the Different Function States in JavaScript 3 min read JavaScript Function Complete Reference 3 min read JS ArrayJavaScript Arrays 7 min read JavaScript Array Methods 7 min read Best-Known JavaScript Array Methods 6 min read Important Array Methods of JavaScript 7 min read JavaScript Array Reference 4 min read Like