Upgrade 6.x -> 7.x

aka "Lambda goes durable"

Version 7.x of Middy no longer supports Node.js versions 20.x. You are highly encouraged to move to Node.js 24.x.

Notable changes

Add support for Durable Functions, caused breaking changes to streamifyResponse.
LLRT can now be used when using executionModeStandard (default) & executionModeDurableContext
Works with new Tenant isolation mode
Works with new multi-concurrency on Lambda Managed Instances

Core

Add support for Durable Functions. Will lack support for timeout abort signal at time of release.
Deprecate streamifyResponse option for executionMode Breaking Change

import middy from '@middy/core'

const lambdaHandler = (_event, _context) => {
  // ...
}
export const handler = middy({ streamifyResponse: true })
  .handler(lambdaHandler)

changes to

import middy from '@middy/core'
import { executionModeStreamifyResponse } from '@middy/core/StreamifyResponse'

const lambdaHandler = (_event, _context) => {
  // ...
}
export const handler = middy({ executionMode: executionModeStreamifyResponse })
  .handler(lambdaHandler)

Util

Added in extra utils to support durable context

Middleware

appconfig

No change

cloudwatch-metrics

No change

do-not-wait-for-empty-event-loop

Add in support for DurableContext

error-logger

No change

event-normalizer

No change

http-content-encoding

Add in zstd support

http-content-negotiation

No change

http-cors

No change

http-error-handler

No change

http-event-normalizer

No change

http-header-normalizer

No change

http-json-body-parser

No change

http-multipart-body-parser

No change

http-partial-response

No change

http-response-serializer

No change

http-router

Updated to handle mixed dynamic/static route priority #1484 Breaking Change

http-security-headers

Update poweredBy to always remove, can be disabled Breaking Change
Update xssProtection to reflect new best practice (exclude, or 0) Breaking Change