Functions overview

Last updated: September 22, 2023

Serverless functions open a world of possibilities for running on-demand, server-side code without having to run a dedicated server. However, managing service discovery, configuring API gateways, and coordinating deployments between your app and your functions can quickly become overwhelming.

With Netlify Functions, your serverless functions are version-controlled, built, and deployed along with the rest of your Netlify site, and we will automatically handle service discovery through our built-in API gateway. This eliminates overhead and brings the power of Deploy Previews and rollbacks to your functions.

To provide faster customer experiences, synchronous functions can use response streaming to get content in front of people as quickly as possible.

For longer-running function tasks, Background Functions allow for extended execution time using asynchronous invocation.

Currently, you can deploy functions built with TypeScript, JavaScript, and Go.

# Manage your functions

Functions deployed from Netlify are immutable. This means that an update to a function on your production branch won’t change the version that was deployed in a branch deploy, or in a Deploy Preview. You can access all versions of your functions in the Netlify web interface, under the Functions tab.

By default, the list displays all of the functions, including background functions, in the current published deploy. To find functions on another deploy, you can use the search field at the top of the list. You can start typing to jump to a particular branch, or find a Deploy Preview by number.

# Default deployment options

By default, all functions are deployed with:

us-east-1 AWS Lambda region
1024 MB of memory
10 second execution limit for synchronous functions, including scheduled functions
15 minute execution limit for background functions
6 MB request and response payload size limit for buffered synchronous functions
20 MB response payload size limit for streamed synchronous functions
256 KB request and response payload size limit for background functions

# Custom deployment options

Depending on your plan, you can contact support to change the custom deployment options for synchronous functions. These deployment options include increasing the maximum execution limit and changing the AWS region. Synchronous functions can have a maximum execution limit of 26 seconds.

Netlify supports the following AWS regions: