AWS Lambda integrates with other AWS services to invoke functions in response to events. Lambda functions can be triggered by event sources including Amazon S3, Amazon DynamoDB Streams, Amazon Kinesis Data Streams, Amazon SQS, Amazon SNS, Amazon API Gateway, Amazon EventBridge, Amazon CloudWatch Events, Amazon Cognito, and many more. Event sources send event data as JSON payloads that Lambda passes to the function handler. Events are processed synchronously (push model), asynchronously (event model), or by Lambda polling a stream or queue (poll model).
Amazon S3 sends event notifications to Lambda when objects are created, modified, or deleted in a bucket. S3 invokes your function asynchronously with an event that contains details about the object. You configure notifications on the S3 bucket to specify which events trigger the function.
dynamodb/stream
subscribeonDynamoDBStreamRecord
Receive DynamoDB Streams records
Amazon DynamoDB Streams captures a time-ordered sequence of item-level modifications in a DynamoDB table. Lambda polls the stream and invokes your function synchronously with a batch of stream records. You create an event source mapping to connect the stream to your function.
kinesis/stream
subscribeonKinesisRecord
Receive Kinesis Data Streams records
Amazon Kinesis Data Streams captures real-time data at scale. Lambda polls the Kinesis stream and invokes your function with a batch of records from one or more shards. You create an event source mapping to connect the stream to your function.
sqs/message
subscribeonSQSMessage
Receive SQS queue messages
Amazon SQS queues messages for asynchronous processing. Lambda polls the queue and invokes your function with a batch of messages. When the function successfully processes a batch, Lambda deletes the messages from the queue. Supports both standard and FIFO queues.
sns/notification
subscribeonSNSNotification
Receive SNS topic notifications
Amazon SNS delivers notifications to Lambda functions subscribed to an SNS topic. When a message is published to the topic, SNS invokes your function asynchronously with the message payload. Supports standard topics for fanout to multiple subscribers.
apigateway/request
subscribeonAPIGatewayRequest
Receive API Gateway HTTP requests
Amazon API Gateway invokes Lambda functions in response to HTTP API requests. API Gateway passes the request details as an event to the function and returns the function response to the caller. Supports REST APIs (v1 payload format) and HTTP APIs (v2 payload format).
eventbridge/event
subscribeonEventBridgeEvent
Receive EventBridge events
Amazon EventBridge delivers events from AWS services, custom applications, and SaaS partners to Lambda functions. EventBridge rules match incoming events and route them to target functions. You create rules that match event patterns and specify the Lambda function as a target.
cloudwatch/scheduledevent
subscribeonScheduledEvent
Receive scheduled invocations
Amazon EventBridge Scheduler (formerly CloudWatch Events scheduled rules) invokes Lambda functions on a schedule. You define a schedule expression using a rate or cron expression, and EventBridge invokes the function at the specified intervals.
cognito/trigger
subscribeonCognitoTrigger
Receive Cognito user pool trigger events
Amazon Cognito invokes Lambda functions as triggers during user pool operations such as sign-up, authentication, and token generation. The function can modify the authentication flow, validate data, or add custom claims.
cloudwatch/alarm
subscribeonCloudWatchAlarm
Receive CloudWatch alarm state changes
Amazon CloudWatch can invoke Lambda functions as alarm actions when a metric alarm changes state. The function receives details about the alarm state change.
Amazon CloudWatch Logs can invoke a Lambda function when a subscription filter matches log events. The log data is delivered as a batch of log events compressed with gzip and base64-encoded.
Messages
✉
S3Event
Amazon S3 Event
S3 object event notification delivered to Lambda
✉
DynamoDBStreamEvent
Amazon DynamoDB Stream Event
Batch of DynamoDB Streams records delivered to Lambda
✉
KinesisEvent
Amazon Kinesis Event
Batch of Kinesis Data Streams records delivered to Lambda
AWS Lambda service endpoint. Event sources deliver events to Lambda which invokes the configured function. The function receives the event payload as the first argument to the handler.
asyncapi: 2.6.0
info:
title: AWS Lambda Event Triggers
description: >-
AWS Lambda integrates with other AWS services to invoke functions in
response to events. Lambda functions can be triggered by event sources
including Amazon S3, Amazon DynamoDB Streams, Amazon Kinesis Data Streams,
Amazon SQS, Amazon SNS, Amazon API Gateway, Amazon EventBridge,
Amazon CloudWatch Events, Amazon Cognito, and many more. Event sources
send event data as JSON payloads that Lambda passes to the function
handler. Events are processed synchronously (push model), asynchronously
(event model), or by Lambda polling a stream or queue (poll model).
version: '2015-03-31'
contact:
name: AWS Support
url: https://aws.amazon.com/contact-us/
termsOfService: https://aws.amazon.com/service-terms/
externalDocs:
description: AWS Lambda Event Source Documentation
url: https://docs.aws.amazon.com/lambda/latest/dg/lambda-services.html
servers:
lambdaRuntime:
url: 'https://lambda.{region}.amazonaws.com'
protocol: https
description: >-
AWS Lambda service endpoint. Event sources deliver events to Lambda
which invokes the configured function. The function receives the event
payload as the first argument to the handler.
variables:
region:
description: The AWS region
channels:
s3/event:
description: >-
Amazon S3 sends event notifications to Lambda when objects are created,
modified, or deleted in a bucket. S3 invokes your function
asynchronously with an event that contains details about the object.
You configure notifications on the S3 bucket to specify which events
trigger the function.
subscribe:
operationId: onS3Event
summary: Receive S3 object event notifications
description: >-
Triggered when an object is created, modified, or deleted in an S3
bucket configured with event notifications. Supports event types
such as s3:ObjectCreated:*, s3:ObjectRemoved:*, s3:ObjectRestore:*,
and s3:Replication:*.
message:
$ref: '#/components/messages/S3Event'
dynamodb/stream:
description: >-
Amazon DynamoDB Streams captures a time-ordered sequence of item-level
modifications in a DynamoDB table. Lambda polls the stream and invokes
your function synchronously with a batch of stream records. You create
an event source mapping to connect the stream to your function.
subscribe:
operationId: onDynamoDBStreamRecord
summary: Receive DynamoDB Streams records
description: >-
Triggered by item-level changes in a DynamoDB table when DynamoDB
Streams is enabled. Lambda polls the stream and invokes your function
with a batch of records containing the old and new item images.
message:
$ref: '#/components/messages/DynamoDBStreamEvent'
kinesis/stream:
description: >-
Amazon Kinesis Data Streams captures real-time data at scale. Lambda
polls the Kinesis stream and invokes your function with a batch of
records from one or more shards. You create an event source mapping
to connect the stream to your function.
subscribe:
operationId: onKinesisRecord
summary: Receive Kinesis Data Streams records
description: >-
Triggered when records are available on a Kinesis data stream. Lambda
reads records in batches and invokes your function with each batch.
Records are base64-encoded.
message:
$ref: '#/components/messages/KinesisEvent'
sqs/message:
description: >-
Amazon SQS queues messages for asynchronous processing. Lambda polls
the queue and invokes your function with a batch of messages. When the
function successfully processes a batch, Lambda deletes the messages
from the queue. Supports both standard and FIFO queues.
subscribe:
operationId: onSQSMessage
summary: Receive SQS queue messages
description: >-
Triggered when messages are available in an SQS queue. Lambda polls
the queue, retrieves a batch of messages, and invokes your function.
If the function returns an error, the messages become visible again
after the visibility timeout.
message:
$ref: '#/components/messages/SQSEvent'
sns/notification:
description: >-
Amazon SNS delivers notifications to Lambda functions subscribed to an
SNS topic. When a message is published to the topic, SNS invokes your
function asynchronously with the message payload. Supports standard
topics for fanout to multiple subscribers.
subscribe:
operationId: onSNSNotification
summary: Receive SNS topic notifications
description: >-
Triggered when a message is published to an SNS topic that has a
Lambda function subscription. SNS invokes the function asynchronously.
message:
$ref: '#/components/messages/SNSEvent'
apigateway/request:
description: >-
Amazon API Gateway invokes Lambda functions in response to HTTP API
requests. API Gateway passes the request details as an event to the
function and returns the function response to the caller. Supports
REST APIs (v1 payload format) and HTTP APIs (v2 payload format).
subscribe:
operationId: onAPIGatewayRequest
summary: Receive API Gateway HTTP requests
description: >-
Triggered by HTTP requests routed through API Gateway to a Lambda
function. The event contains HTTP method, headers, query parameters,
path parameters, and the request body.
message:
oneOf:
- $ref: '#/components/messages/APIGatewayProxyEvent'
- $ref: '#/components/messages/APIGatewayV2ProxyEvent'
eventbridge/event:
description: >-
Amazon EventBridge delivers events from AWS services, custom
applications, and SaaS partners to Lambda functions. EventBridge rules
match incoming events and route them to target functions. You create
rules that match event patterns and specify the Lambda function as a
target.
subscribe:
operationId: onEventBridgeEvent
summary: Receive EventBridge events
description: >-
Triggered when an event matching a rule pattern is published to an
EventBridge event bus. Events from AWS services, custom applications,
and third-party SaaS providers can all trigger Lambda functions
through EventBridge.
message:
$ref: '#/components/messages/EventBridgeEvent'
cloudwatch/scheduledevent:
description: >-
Amazon EventBridge Scheduler (formerly CloudWatch Events scheduled
rules) invokes Lambda functions on a schedule. You define a schedule
expression using a rate or cron expression, and EventBridge invokes
the function at the specified intervals.
subscribe:
operationId: onScheduledEvent
summary: Receive scheduled invocations
description: >-
Triggered by an EventBridge scheduled rule at a fixed rate or cron
schedule. The event contains the schedule ARN, time, and rule
details.
message:
$ref: '#/components/messages/ScheduledEvent'
cognito/trigger:
description: >-
Amazon Cognito invokes Lambda functions as triggers during user pool
operations such as sign-up, authentication, and token generation.
The function can modify the authentication flow, validate data, or
add custom claims.
subscribe:
operationId: onCognitoTrigger
summary: Receive Cognito user pool trigger events
description: >-
Triggered by Cognito user pool operations including pre-sign-up,
post-confirmation, pre-authentication, post-authentication,
custom message, define auth challenge, create auth challenge,
verify auth challenge response, pre-token generation, and user
migration.
message:
$ref: '#/components/messages/CognitoEvent'
cloudwatch/alarm:
description: >-
Amazon CloudWatch can invoke Lambda functions as alarm actions when a
metric alarm changes state. The function receives details about the
alarm state change.
subscribe:
operationId: onCloudWatchAlarm
summary: Receive CloudWatch alarm state changes
description: >-
Triggered when a CloudWatch alarm transitions between OK, ALARM,
and INSUFFICIENT_DATA states.
message:
$ref: '#/components/messages/CloudWatchAlarmEvent'
cloudwatch/logs:
description: >-
Amazon CloudWatch Logs can invoke a Lambda function when a subscription
filter matches log events. The log data is delivered as a batch of log
events compressed with gzip and base64-encoded.
subscribe:
operationId: onCloudWatchLogsEvent
summary: Receive CloudWatch Logs subscription filter events
description: >-
Triggered when log events match a CloudWatch Logs subscription
filter pattern. The event contains a base64-encoded, gzip-compressed
batch of log events.
message:
$ref: '#/components/messages/CloudWatchLogsEvent'
components:
messages:
S3Event:
name: S3Event
title: Amazon S3 Event
summary: S3 object event notification delivered to Lambda
description: >-
Contains information about S3 bucket events including the bucket name,
object key, size, eTag, and the event type that triggered the function.
S3 events are delivered asynchronously.
contentType: application/json
payload:
$ref: '#/components/schemas/S3Event'
DynamoDBStreamEvent:
name: DynamoDBStreamEvent
title: Amazon DynamoDB Stream Event
summary: Batch of DynamoDB Streams records delivered to Lambda
description: >-
Contains a batch of records from a DynamoDB stream. Each record
includes the event type (INSERT, MODIFY, REMOVE), the new and old
item images (depending on stream view type), and metadata about the
change.
contentType: application/json
payload:
$ref: '#/components/schemas/DynamoDBStreamEvent'
KinesisEvent:
name: KinesisEvent
title: Amazon Kinesis Event
summary: Batch of Kinesis Data Streams records delivered to Lambda
description: >-
Contains a batch of records from a Kinesis data stream. Each record
includes base64-encoded data, a partition key, and a sequence number.
contentType: application/json
payload:
$ref: '#/components/schemas/KinesisEvent'
SQSEvent:
name: SQSEvent
title: Amazon SQS Event
summary: Batch of SQS messages delivered to Lambda
description: >-
Contains a batch of messages from an SQS queue. Each message includes
the message body, message attributes, and metadata such as the message
ID and receipt handle.
contentType: application/json
payload:
$ref: '#/components/schemas/SQSEvent'
SNSEvent:
name: SNSEvent
title: Amazon SNS Event
summary: SNS notification delivered to Lambda
description: >-
Contains one or more SNS notification records. Each record includes
the SNS topic ARN, subject, message body, timestamp, and message
attributes.
contentType: application/json
payload:
$ref: '#/components/schemas/SNSEvent'
APIGatewayProxyEvent:
name: APIGatewayProxyEvent
title: API Gateway REST API Proxy Event (v1)
summary: HTTP request from API Gateway REST API
description: >-
Contains the full HTTP request details from API Gateway REST API
including method, path, headers, query parameters, path parameters,
stage variables, request context, and the request body.
contentType: application/json
payload:
$ref: '#/components/schemas/APIGatewayProxyEvent'
APIGatewayV2ProxyEvent:
name: APIGatewayV2ProxyEvent
title: API Gateway HTTP API Proxy Event (v2)
summary: HTTP request from API Gateway HTTP API
description: >-
Contains the HTTP request details from API Gateway HTTP API in the
v2 payload format, with a simplified structure compared to the v1
format. Includes request context with HTTP method, path, source IP,
and user agent.
contentType: application/json
payload:
$ref: '#/components/schemas/APIGatewayV2ProxyEvent'
EventBridgeEvent:
name: EventBridgeEvent
title: Amazon EventBridge Event
summary: Event from EventBridge event bus
description: >-
Contains an event matched by an EventBridge rule. The event includes
the source service, detail type, account, region, and the event
detail containing the event-specific data.
contentType: application/json
payload:
$ref: '#/components/schemas/EventBridgeEvent'
ScheduledEvent:
name: ScheduledEvent
title: Scheduled Event
summary: Scheduled invocation from EventBridge Scheduler
description: >-
Represents a scheduled event trigger. Contains the schedule rule ARN,
timestamp, and identifying information. The detail-type is
Scheduled Event.
contentType: application/json
payload:
$ref: '#/components/schemas/ScheduledEvent'
CognitoEvent:
name: CognitoEvent
title: Amazon Cognito User Pool Trigger Event
summary: Cognito user pool trigger event
description: >-
Contains details about a Cognito user pool trigger including the
trigger source, user pool ID, user attributes, and request/response
parameters specific to the trigger type.
contentType: application/json
payload:
$ref: '#/components/schemas/CognitoEvent'
CloudWatchAlarmEvent:
name: CloudWatchAlarmEvent
title: Amazon CloudWatch Alarm Event
summary: CloudWatch alarm state change event
description: >-
Contains information about a CloudWatch alarm state change including
the alarm name, state, reason, and metric details.
contentType: application/json
payload:
$ref: '#/components/schemas/CloudWatchAlarmEvent'
CloudWatchLogsEvent:
name: CloudWatchLogsEvent
title: Amazon CloudWatch Logs Event
summary: CloudWatch Logs subscription filter event
description: >-
Contains a base64-encoded, gzip-compressed batch of log events from
a CloudWatch Logs subscription filter.
contentType: application/json
payload:
$ref: '#/components/schemas/CloudWatchLogsEvent'
schemas:
S3Event:
type: object
description: Amazon S3 event notification
properties:
Records:
type: array
description: List of S3 event records
items:
type: object
properties:
eventVersion:
type: string
description: Event structure version
eventSource:
type: string
description: Event source identifier
const: aws:s3
awsRegion:
type: string
description: AWS region where the event occurred
eventTime:
type: string
format: date-time
description: Time when the event occurred
eventName:
type: string
description: >-
The event type (e.g. ObjectCreated:Put,
ObjectRemoved:Delete)
userIdentity:
type: object
properties:
principalId:
type: string
description: The principal ID of the user
requestParameters:
type: object
properties:
sourceIPAddress:
type: string
description: Source IP address of the request
responseElements:
type: object
properties:
x-amz-request-id:
type: string
x-amz-id-2:
type: string
s3:
type: object
properties:
s3SchemaVersion:
type: string
configurationId:
type: string
description: ID of the S3 notification configuration
bucket:
type: object
properties:
name:
type: string
description: The bucket name
ownerIdentity:
type: object
properties:
principalId:
type: string
arn:
type: string
description: The bucket ARN
object:
type: object
properties:
key:
type: string
description: The object key (URL-encoded)
size:
type: integer
description: Object size in bytes
eTag:
type: string
description: Object eTag
versionId:
type: string
description: Object version if bucket is versioning-enabled
sequencer:
type: string
description: Hexadecimal value for event ordering
DynamoDBStreamEvent:
type: object
description: Amazon DynamoDB Streams event
properties:
Records:
type: array
description: List of DynamoDB stream records
items:
type: object
properties:
eventID:
type: string
description: A globally unique identifier for the event
eventName:
type: string
description: The type of data modification
enum:
- INSERT
- MODIFY
- REMOVE
eventVersion:
type: string
eventSource:
type: string
const: aws:dynamodb
awsRegion:
type: string
dynamodb:
type: object
properties:
ApproximateCreationDateTime:
type: integer
description: Unix epoch timestamp of the change
Keys:
type: object
description: >-
The primary key attributes for the item that was modified
additionalProperties:
$ref: '#/components/schemas/AttributeValue'
NewImage:
type: object
description: >-
The item in the table as it appeared after it was modified
additionalProperties:
$ref: '#/components/schemas/AttributeValue'
OldImage:
type: object
description: >-
The item in the table as it appeared before it was modified
additionalProperties:
$ref: '#/components/schemas/AttributeValue'
SequenceNumber:
type: string
description: The sequence number of the stream record
SizeBytes:
type: integer
description: The size of the stream record in bytes
StreamViewType:
type: string
description: >-
The type of data from the modified DynamoDB item
enum:
- KEYS_ONLY
- NEW_IMAGE
- OLD_IMAGE
- NEW_AND_OLD_IMAGES
eventSourceARN:
type: string
description: The ARN of the DynamoDB stream
AttributeValue:
type: object
description: A DynamoDB attribute value
properties:
S:
type: string
description: String value
N:
type: string
description: Number value (string representation)
B:
type: string
description: Binary value (base64-encoded)
BOOL:
type: boolean
description: Boolean value
NULL:
type: boolean
description: Null value marker
L:
type: array
description: List value
items:
$ref: '#/components/schemas/AttributeValue'
M:
type: object
description: Map value
additionalProperties:
$ref: '#/components/schemas/AttributeValue'
SS:
type: array
description: String set value
items:
type: string
NS:
type: array
description: Number set value
items:
type: string
BS:
type: array
description: Binary set value
items:
type: string
KinesisEvent:
type: object
description: Amazon Kinesis Data Streams event
properties:
Records:
type: array
description: List of Kinesis stream records
items:
type: object
properties:
kinesis:
type: object
properties:
kinesisSchemaVersion:
type: string
partitionKey:
type: string
description: The partition key for the record
sequenceNumber:
type: string
description: The unique identifier of the record within its shard
data:
type: string
description: The data blob (base64-encoded)
approximateArrivalTimestamp:
type: number
description: >-
Approximate time the record was inserted into the stream
eventSource:
type: string
const: aws:kinesis
eventVersion:
type: string
eventID:
type: string
description: >-
A unique identifier for the event composed of shard ID and
sequence number
eventName:
type: string
description: The event type
const: aws:kinesis:record
invokeIdentityArn:
type: string
description: The ARN of the IAM role used for invocation
awsRegion:
type: string
eventSourceARN:
type: string
description: The ARN of the Kinesis stream
SQSEvent:
type: object
description: Amazon SQS event
properties:
Records:
type: array
description: List of SQS messages
items:
type: object
properties:
messageId:
type: string
description: A unique identifier for the message
receiptHandle:
type: string
description: >-
An identifier associated with the act of receiving the message
body:
type: string
description: The message body
attributes:
type: object
description: Message system attributes
properties:
ApproximateReceiveCount:
type: string
SentTimestamp:
type: string
SenderId:
type: string
ApproximateFirstReceiveTimestamp:
type: string
SequenceNumber:
type: string
MessageGroupId:
type: string
MessageDeduplicationId:
type: string
messageAttributes:
type: object
description: Custom message attributes
additionalProperties:
type: object
properties:
stringValue:
type: string
binaryValue:
type: string
dataType:
type: string
md5OfBody:
type: string
description: An MD5 digest of the message body
eventSource:
type: string
const: aws:sqs
eventSourceARN:
type: string
description: The ARN of the SQS queue
awsRegion:
type: string
SNSEvent:
type: object
description: Amazon SNS event
properties:
Records:
type: array
description: List of SNS notification records
items:
type: object
properties:
EventVersion:
type: string
EventSubscriptionArn:
type: string
description: The ARN of the subscription
EventSource:
type: string
const: aws:sns
Sns:
type: object
properties:
SignatureVersion:
type: string
Timestamp:
type: string
format: date-time
description: The time the notification was published
Signature:
type: string
SigningCertUrl:
type: string
MessageId:
type: string
description: A unique identifier for the message
Message:
type: string
description: The message published to the topic
MessageAttributes:
type: object
description: Custom message attributes
additionalProperties:
type: object
properties:
Type:
type: string
Value:
type: string
Type:
type: string
description: The message type
UnsubscribeUrl:
type: string
TopicArn:
type: string
description: The ARN of the SNS topic
Subject:
type: string
description: The subject of the notification
APIGatewayProxyEvent:
type: object
description: API Gateway REST API (v1) proxy integration event
properties:
resource:
type: string
description: The resource path (e.g. /users/{id})
path:
type: string
description: The actual request path
httpMethod:
type: string
description: The HTTP method (GET, POST, PUT, DELETE, etc.)
headers:
type: object
additionalProperties:
type: string
description: Request headers
multiValueHeaders:
type: object
additionalProperties:
type: array
items:
type: string
queryStringParameters:
type: object
additionalProperties:
type: string
description: Query string parameters
multiValueQueryStringParameters:
type: object
additionalProperties:
type: array
items:
type: string
pathParameters:
type: object
additionalProperties:
type: string
description: Path parameters extracted from the resource path
stageVariables:
type: object
additionalProperties:
type: string
description: Stage variables defined in the API Gateway stage
requestContext:
type: object
description: Request context including authorizer and identity details
properties:
accountId:
type: string
resourceId:
type: string
stage:
type: string
requestId:
type: string
identity:
type: object
properties:
sourceIp:
type: string
userAgent:
type: string
resourcePath:
type: string
httpMethod:
type: string
apiId:
type: string
body:
type: string
description: The request body (may be base64-encoded)
isBase64Encoded:
type: boolean
description: Whether the body is base64-encoded
APIGatewayV2ProxyEvent:
type: object
description: API Gateway HTTP API (v2) proxy integration event
properties:
version:
type: string
description: Payload format version
const: '2.0'
routeKey:
type: string
description: The route key (e.g. GET /users/{id})
rawPath:
type: string
description: The raw request path
rawQueryString:
type: string
description: The raw query string
headers:
type: object
additionalProperties:
type: string
queryStringParameters:
type: object
additionalProperties:
type: string
pathParameters:
type: object
additionalProperties:
type: string
requestContext:
type: object
properties:
accountId:
type: string
apiId:
type: string
domainName:
type: string
domainPrefix:
type: string
http:
type: object
properties:
method:
type: string
path:
type: string
protocol:
type: string
sourceIp:
type: string
userAgent:
type: string
requestId:
type: string
routeKey:
type: string
stage:
type: string
time:
type: string
timeEpoch:
type: integer
body:
type: string
isBase64Encoded:
type: boolean
stageVariables:
type: object
additionalProperties:
type: string
EventBridgeEvent:
type: object
description: Amazon EventBridge event
properties:
version:
type: string
description: Event structure version
const: '0'
id:
type: string
description: A unique identifier for the event
source:
type: string
description: >-
The source of the event (e.g. aws.ec2, custom.myapp)
detail-type:
type: string
description: The type of event detail
account:
type: string
description: The 12-digit AWS account ID
time:
type: string
format: date-time
description: The time the event was generated
region:
type: string
description: The AWS region where the event occurred
resources:
type: array
description: ARNs of resources involved in the event
items:
type: string
detail:
type
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