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Node.js – util.getSystemErrorName() Method
The util.getSystemErrorName() method is used for returning the string name of the numeric error code that is returned from the Node.js API. There is a mapping between the error codes and error names which is platform-dependent.
Syntax
util.getSystemErrorName(err)
Parameters
It takes a single parameter −
err −This parameter takes input as a numeric value that will specify the error number or the error code.
The function returns the error name based upon the error code or error number passed in the err parameter.
Some common system errors are - EACCES, EEXIST, EISDIR, ENOENT, ENOTDIR, ENOTEMPTY, etc. Browse this page to find the complete information about system error codes.
Example 1
Create a file with the name "systemErrorName.js" and copy the following code snippet. After creating the file, use the command "node systemErrorName.js" to run this code.
// util.getSystemErrorName() Demo Example
// Importing v8 module
const util = require('util');
const fs = require('fs');
var location = 'file/not/exist';
fs.access(location, (err) => {
// Print error if file does not exists
const name = util.getSystemErrorName(err.errno);
// Printing the error name from mapping
console.error(name);
});Output
C:\home
ode>> node systemErrorName.js ENOENT
Example 2
Let’s have a look at one more example
// util.getSystemErrorName() Demo Example
// Importing v8 module
const util = require('util');
const fs = require('fs');
// Checking if directory exists inside this file
fs.readdir('./index.js', (err) => {
// Print error if directory does not exists
const name = util.getSystemErrorName(err.errno);
// Printing the error name from mapping
console.error('Error Name: ', name);
console.error('Error Code: ', err.errno);
});Output
C:\home
ode>> node systemErrorName.js Error Name: ENOTDIR Error Code: -20
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