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JavaScript AggregateError object

Last Updated : 07 Jun, 2022
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The JavaScript AggregateError object is used to reflect the overall error of many single errors. This can be used when multiple errors need to be represented in the form of a combined error, for example, it can be thrown by Promise.any() when all the promises passed to it are rejected.

Construction: The constructor AggregateError() is used to create a new object of AggregateError.

Instance Properties: This object has two properties:

  • message: We use the AggregateError.prototype.message to display the message of error. The default error message shown is " ".
  • name: We use the AggregateError.prototype.name to display the name of error. The default error name shown is AggregateError.

Example 1: This example shows the catching of an AggregateError.

JavaScript 
<script>
Promise.any([
    Promise.reject(
      new Error(
        "There is any error occurred"
      )
    ),
  ]).catch(n => {
  
    // Check if AggregateError
    console.log(
      n instanceof AggregateError
    );
    
    // Print the message of the error
    console.log(n.message);
    
    // Print the name of the error
    console.log(n.name);
    
    // Print all the errors that this
    // error comprises
    console.log(n.errors);
  }
);</script>

Output:

true
All promises were rejected
AggregateError
[Error: There is any error occurred]

Example 2: This example shows the creating of an AggregateError.

JavaScript 
<script>
try {
    throw new AggregateError([
      new Error(
        "This is Error 1"
      ),
      new Error(
        "This is Error 2"
      ),
      new Error(
        "This is Error 3"
      ),
    ], 'These are multiple errors');
  } catch (n) {
  
      // Check if AggregateError
      console.log(
        n instanceof AggregateError
      );
      
      // Print the message of the error
      console.log(n.message);
      
      // Print the name of the error
      console.log(n.name);
      
      // Print all the errors that this
      // error comprises
      console.log(n.errors);
  }
</script>

Output:

true
These are multiple errors
AggregateError
[Error: This is Error 1, 
 Error: This is Error 2, 
 Error: This is Error 3]

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JavaScript AggregateError object

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