Node.js process.setuid() Method

The process.setuid() method is an inbuilt application programming interface of the process module which is used to set the user identity of the Node.js process.

Syntax:

process.setuid(id)

Parameters: This method accepts single parameter as mentioned above and described below:  

• id: It is a required parameter that holds a String or an integer denotes either numeric ID or username string, if username is passed, it blocks while resolving the associated numeric ID.

Return: It does not return any value.

Note: This function will only work on POSIX platforms. Not available on windows or android platforms so will cause an error i.e. TypeError, setuid is not a function.

Below examples illustrate the use of process.setuid() method in Node.js:

Example 1:

Javascript

// Node.js program to demonstrate the
// process.setuid() Method

// Including process module
const process = require('process');

// Print the user identity of the Node.js
//  process and check whether the methods
// exists or not
if (process.getuid && process.setuid ) {

  // Setting user id
  process.setuid(400);

  // Printing getuid() value
  console.log("The user identity of the Node.js"
      + " process:", process.getuid());
}

Output:

The user identity of the Node.js process: 400

Example 2:

Javascript

// Node.js program to demonstrate the
// process.setuid() Method

// Including process module
const process = require('process');

// Set user id and check whether
// the method exists or not
if (process.setuid) {

  // Within try catch
  try {
    process.setuid(696);
    console.log("User id has successfully been set");
  } catch (err) {
    console.log("Failed to set user id:", err);
  }
}

// Check whether the method exists or not
if (process.getuid) {

  // Printing getuid() value
  console.log("The user identity of the Node.js"
        + " process:", process.getuid());
}

Output:

User id has successfully been set
The user identity of the Node.js process: 696

Note: The above program will compile and run by using the node filename.js command.

Reference: https://nodejs.org/api/process.html#process_process_setuid_id