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Object Boolean Object DataView Object Date Object Debug Object Enumerator Object Error Object constructor Property (Error) prototype Property (Error) description Property (Error) message Property (Error) name Property (Error) number Property (Error) stack Property (Error) stackTraceLimit Property (Error) toString Method (Error) valueOf Method (Error) Float32Array Object Float64Array Object Function Object Global Object Int8Array Object object error message from webpage Int16Array Object Int32Array Object Intl.Collator Object Intl.DateTimeFormat Object Intl.NumberFormat Object JSON Object Map Object Math Object Number Object Object Object Promise Object Proxy Object Reflect Object RegExp Object Regular Expression Object Set Object String Object Symbol Object Uint8Array Object Uint8ClampedArray Object Uint16Array Object Uint32Array Object VBArray Object WeakMap Object WeakSet Object WinRTError Object TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Error Object (JavaScript) Contains information about errors.Syntax Copy errorObj = new Error() errorObj = new Error([number]) errorObj = new Error([number[, description]]) ParameterserrorObjRequired. The variable name to which the Error object is assigned. The variable assignment is omitted when you create the error using a throw statement.numberOptional. Numeric value assigned to an error. Zero if omitted.descriptionOptional. Brief string that describes an error. Empty string if omitted.RemarksWhenever a run-time error occurs, an instance of the Er
HTML CSS JavaScript Graphics HTTP APIs / DOM Apps MathML References & Guides Learn the Web Tutorials References try catch javascript best practices Developer Guides Accessibility Game development ...more docs Mozilla Docs Add-ons Firefox javascript try catch not working WebExtensions Developer ToolsFeedback Get Firefox help Get web development help Join the MDN community Report a throw new error java content problem Report a bug Search Search Languages Español (es) Français (fr) 日本語 (ja) 한국어 (ko) Português (do Brasil) (pt-BR) 中文 (简体) (zh-CN) Add a translation Edit Advanced https://msdn.microsoft.com/en-us/library/dww52sbt(v=vs.94).aspx Advanced History Print this article MDN Web technology For developers JavaScript JavaScript reference Statements and declarations try...catch Your Search Results samuele-artuso Markus Prokott fscholz valango SphinxKnight themitchy madarche Protron Noitidart Delapouite Havvy dezzadk indolering Sheppy trevorh Niggler secoif Dietrich Mgjbot Nanto vi Ptak82 Maian Nickolay Dria try...catch In This Article SyntaxDescriptionUnconditional catch clauseConditional catch clausesThe https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/try...catch exception identifierThe finally clauseExamplesNested try-blocksReturning from a finally blockSpecificationsBrowser compatibilitySee also The try...catch statement marks a block of statements to try, and specifies a response, should an exception be thrown. Syntax try { try_statements } [catch (exception_var_1 if condition_1) { // non-standard catch_statements_1 }] ... [catch (exception_var_2) { catch_statements_2 }] [finally { finally_statements }] try_statements The statements to be executed. catch_statements_1, catch_statements_2 Statements that are executed if an exception is thrown in the try block. exception_var_1, exception_var_2 An identifier to hold an exception object for the associated catch clause. condition_1 A conditional expression. finally_statements Statements that are executed after the try statement completes. These statements execute regardless of whether or not an exception was thrown or caught. Description The try statement consists of a try block, which contains one or more statements ({} must always be used, also for single statements), and at least one catch clause or a finally clause, or both. That is, there are three forms of the try sta
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to log client-side errors and report them to your servers. It’s also one of the major mechanisms by which Sentry’s client JavaScript integration (raven-js) works. You listen to the onerror event by assigning a function to window.onerror: window.onerror = function (msg, url, lineNo, columnNo, error) { // ... handle error ... return false; } When an error is thrown, the following arguments are passed to the function: msg – The message associated with the error, e.g. “Uncaught ReferenceError: foo is not defined” url – The URL of the script or document associated with the error, e.g. “/dist/app.js” lineNo – The line number (if available) columnNo – The column number (if available) error – The Error object associated with this error (if available) The first four arguments tell you in which script, line, and column the error occurred. The final argument, Error object, is perhaps the most valuable. Let’s learn why. The Error object and error.stack At first glance the Error object isn’t very special. It contains 3 standardized properties: message, fileName, and lineNumber. Redundant values that already provided to you via window.onerror. The valuable part is a non-standard property: Error.prototype.stack. This stack property tells you at what source location each frame of the program was when the error occurred. The stack trace can be a critical part of debugging an error. And despite being non-standard, this property is available in every modern browser. Here’s an example of the Error object’s