JavaScript SyntaxError - Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead Last Updated : 24 Aug, 2020 Comments Improve Suggest changes Like Article Like Report This JavaScript warning Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead occurs if there is a source map syntax defined in a JavaScript source, Which has been depreciated. Message: Warning: SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead Warning: SyntaxError: Using //@ to indicate sourceMappingURL pragmas is deprecated. Use //# instead Error Type: This is a warning that a SyntaxError has occurred. JavaScript execution won't be halted. Cause of Error: Somewhere in the code, there is a source map syntax used in a JavaScript source, Which is depreciated. Example 1: In this example, the sourceURL is used with @, Which is depreciated. HTML <script> //@ sourceURL=http://abcd.com/path/name.map </script> Output: Warning: SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead Example 2: In this example, the sourceMappingURL is used with @, Which is depreciated. HTML <script> //@ sourceMappingURL=http://abcd.com/path/name.map </script> Output: arning: SyntaxError: Using //@ to indicate sourceMappingURL pragmas is deprecated. Use //# instead Reference link: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Deprecated_source_map_pragma Comment More infoAdvertise with us P PranchalKatiyar Follow Improve Article Tags : JavaScript Web Technologies JavaScript-Errors Explore JavaScript Tutorial JavaScript is a programming language used to create dynamic content for websites. It is a lightweight, cross-platform, and single-threaded programming language. It's an interpreted language that executes code line by line, providing more flexibility.Client Side: On the client side, JavaScript works 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