Introduction to Stacktrace-Parser

The stacktrace-parser is an essential tool for developers aiming to streamline the process of debugging and error analysis. This library simplifies the parsing of stack traces in various environments, making it easier to identify, inspect, and resolve issues within your code.

Core API Functions of Stacktrace-Parser

The stacktrace-parser library offers several functionalities through its API. Here, we explore these fundamental functions with examples:

1. parseStackTrace

This function parses a stack trace string and returns a structured object representation of the stack frames.

  
    import { parseStackTrace } from 'stacktrace-parser';

    const stackString = `Error: Something went wrong
        at Object. (app.js:10:15)
        at Module._compile (module.js:609:30)
        at Object.Module._extensions..js (module.js:616:10)`;

    const parsedStack = parseStackTrace(stackString);
    console.log(parsedStack);
  

2. getFunctionName

This function extracts the function name from a stack frame.

  
    import { getFunctionName } from 'stacktrace-parser';

    const stackFrame = {
      'functionName': 'Object.',
      'file': 'app.js',
      'lineNumber': 10,
      'column': 15
    };

    const functionName = getFunctionName(stackFrame);
    console.log(functionName); // Output: Object.
  

3. getSourceFileName

This function retrieves the source file name from a stack frame.

  
    import { getSourceFileName } from 'stacktrace-parser';

    const stackFrame = {
      'functionName': 'Object.',
      'file': 'app.js',
      'lineNumber': 10,
      'column': 15
    };

    const fileName = getSourceFileName(stackFrame);
    console.log(fileName); // Output: app.js
  

4. getLineNumber

This function extracts the line number from a stack frame.

  
    import { getLineNumber } from 'stacktrace-parser';

    const stackFrame = {
      'functionName': 'Object.',
      'file': 'app.js',
      'lineNumber': 10,
      'column': 15
    };

    const lineNumber = getLineNumber(stackFrame);
    console.log(lineNumber); // Output: 10
  

Application Example Using Stacktrace-Parser API

Let’s put the above APIs into action in a sample application:

  
    import { parseStackTrace, getFunctionName, getSourceFileName, getLineNumber } from 'stacktrace-parser';

    function handleError(error) {
      const parsedStack = parseStackTrace(error.stack);

      parsedStack.forEach(frame => {
        const functionName = getFunctionName(frame);
        const fileName = getSourceFileName(frame);
        const lineNumber = getLineNumber(frame);

        console.log(`Error in ${functionName} at ${fileName}:${lineNumber}`);
      });
    }

    try {
      throw new Error('An unexpected error occurred!');
    } catch (error) {
      handleError(error);
    }
  

In this example, an error is thrown and caught within a try-catch block. The handleError function parses the stack trace and logs detailed information about each frame, including the function name, file name, and line number.

The stacktrace-parser library thus equips developers with the necessary tools to effectively decode stack traces, aiding in the rapid identification and resolution of issues.

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