invoke

Mon, 21 Sep 2026 15:16:28 +0000

LambdaClient.invoke(name, payload, [options])

LambdaClient.invoke invokes an AWS Lambda function.

Parameters

Parameter	Type	Description
name	string	Name of the function to invoke.
payload	string	Payload to send to the function being invoked.
options	InvocationOptions	Additional options to customize the invocation.

InvocationOptions

InvocationOptions is an object used to customize the invocation of a Lambda function. It has the following properties:

Property	Type	Description
invocationType	string (optional)	Specifies the invocation type (synchronous or asynchronous). Possible values are: `RequestResponse`, which invokes the function synchronously, `Event`, which invokes the function asynchronously, and `DryRun` which validates the parameter values and verifies that the user or role has permission to invoke the function. Default is `RequestResponse`.
logType	string (optional)	Specifies the type of log to include in the response. Set to `Tail` to include the execution log in the response. Applies to synchronously invoked functions only. Default is `None`.
clientContext	string (optional)	Client context to pass to the function. Can be made up of up to 3,583 bytes of base64-encoded data. Default is `null`.
qualifier	string (optional)	Version or alias of the function to invoke.

Returns

Type	Description
Promise<InvocationResponse>	A promise that fulfills when the object has been deleted from S3.

InvocationResponse

InvocationResponse is an object that represents the response of an invocation. It has the following properties:

Property	Type	Description
statusCode	number	Status code of the invocation.
executedVersion	string (optional)	The version of the function that executed.
logResult	string (optional)	Log result of the invocation.
payload	string (optional)	Payload returned by the function.

Example

import {
  AWSConfig,
  LambdaClient,
} from 'https://jslib.k6.io/aws/0.14.0/lambda.js';
import { check } from 'k6';

const awsConfig = new AWSConfig({
  region: __ENV.AWS_REGION,
  accessKeyId: __ENV.AWS_ACCESS_KEY_ID,
  secretAccessKey: __ENV.AWS_SECRET_ACCESS_KEY,
  sessionToken: __ENV.AWS_SESSION_TOKEN,
});

const lambdaClient = new LambdaClient(awsConfig);

export default async function () {
  const response = await lambdaClient.invoke('add-numbers', JSON.stringify({ x: 1, y: 2 }));

  check(response, {
    'status is 200': (r) => r.statusCode === 200,
    'payload is 3': (r) => r.payload === 3,
  });
}