How To Test your AWS Lambda Locally with SAM

AWS Lambda functions are extremely powerful FaaS components. In this video, I teach you how to use Serverless Application Model (SAM) cli to test your functions on your local machine before pushing your code changes.
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[@BeABetterDev]

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[@cezaraugustomezzalira5230]

Thank you for sharing this knowledge! It helped me to create my first Lambda Function and test without have any AWS account.

[@BeABetterDev]

You're very welcome Cezar! Glad I could help :)

[@MohamadOmar-oi3ur]

That was so quick, enough, clear, and perfect to learn from !! Just amazing man thanks a lot. Do you know that I've been looking for this explanation 3 years ago for several months and nothing found related !! You save my life now , I would like to save this video as reference BIG LIKE!

[@BeABetterDev]

So glad I could help!

[@tiagoaicapital]

Great video... please can you make a video on how we can re-used lambda function via terraform from visual studio? 🙏

[@fb-gu2er]

It would be nice to make a video that includes token authorization to access the endpoint

[@ArbitraryZer0101]

What if the lambda relies on a dynamo db table? Doesnt work in this case unless something else is configured and its unclear

[@MarcosVSilva-cj7yf]

Great video mate! I would love a python version too. You are a great source of knowledge for me.

[@BeABetterDev]

Thanks Marcos! I'll try to mixin more python videos. Cheers.

[@adityar6511]

@@BeABetterDev Yeah great video, but was looking for the python version of it

[@a1shay1979]

hi, how can I invoke local lambda from the local api gateway ?

[@juanvidal6067]

I would also like to know this

[@JKhalaf]

Now that we have a CDK, is it possible to test our AWS Lambda locally with the CDK? Can you please do a video on that (assuming that is possible).

[@BeABetterDev]

Hey Khalaf, Good news for us is that the beta version of CDK supports running Lambda locally. I haven't tried it personally yet but have heard good things. Check it out here: docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-cdk-testing.html

[@mroobert]

How is this working without using 'sam build' before using 'sam invoke'?

[@vamsiakhumukhi9582]

Genius. Love your tutorials!!

[@BeABetterDev]

Thanks Vamsi!

[@alirezaop3484]

Best Video on this topic thank you

[@BeABetterDev]

You're very welcome!

[@GLu-tb1pb]

what happens if my API Gateway set up contradicts the YAML - If my Gateway already has [GET, /help to call a specific Lambda], will deploying this override the existing options?

[@TheSpawnrad]

Great video, nice explanations

[@BeABetterDev]

Glad you liked it!

[@rulisastra]

how simple! it means youve made a great tutorial! but one question tho, do you configure the AWS secret id or else in you local??

[@user-mm7qo2rx7u]

sam local invoke error:failed to deserialize response from. help ❤❤❤

[@eduardotavarez9638]

How do you make it so you do not have to make a build to test new code? To see my changes I need to run sam build again.

[@burakbey21]

Great content, both clear and concise

[@BeABetterDev]

Thank you !

[@onomatopeia891]

Hello, can you also do a tutorial on testing lambda locally with DynamoDB? Thank you.

[@TheOmegaX7]

Great Video!! Is there a Python version too?

[@jsg1464]

Any idea how to create a S3 bucket add a test file and then test the lambda using local invoke?

[@alanwill]

Thanks for posting this. Do you have any thoughts on how to perform local testing with a SAM template that relies on other AWS services, i.e. mocking say S3 or SQS or some other service locally. Also, how would this testing work with a nested SAM stack? I've struggled with both these examples hence the questions :)

[@EnriqueSalceda]

Docker compose to connect a SQS/S3 container with Lambda. I've done it before and I can replicate the entire cloud environment in my local machine. I worked with a monolith that put a bunch of events in background workers, those workers pushed to SQS and then Lambda pulled from the SQS, finally lambda was pushing to Salesforce.

[@leftg1631]

I've been trying to set up for ages now - on a mac arm64 which I think causes issues. Everything else works fine aws cli, aws sam cli, my docker works fine with other applications but i get not able to create docker image. I've tried all solutions re modifying the architecture in the local debug config. Is driving me nuts!

[@vishalkothari8065]

Can u make a video using aws amplify to run lambda locally

[@SriniVasan-ml6we]

Just a very basic question.. How does this SAM CLI knows to which AWS account it has to deploy to?

[@jsg1464]

pretty sure you can pass the --profile argument

[@CommonSense11111]

How do you set a breakpoint?

[@sudhansusahoo4602]

It will be great if you can provide a video using Python.

[@mauriciopareja3899]

Is possible download lambda function aws tha was create node js 8.0 and run locally with SAM? thaks

[@soniathomase7757]

I have been assigned an AWS role from the client and has a lambda function. How do I setup this lambda locally on my machine? Is it ever possible? I dont have the secret access id's etc as im just assigned with a role. What do I need to do?

[@rodrigoo_ferreira]

how I do to use layers in localtest with python??

[@MayAlexanderVillamilLozano]

Hi, can this tool be used to test a Lambda defined as a container image?

[@kesterbelgrove818]

Can we have a python version of this please? For those of us who are more familiar with and need specific python tools like pandas? Thanks

[@arthurghideli5969]

I'm having an issue using SAM plugin to test locally my lambdas when the project has a custom Parent. Any thoughts on it?

[@rahimkhan-fh9dd]

Can we test lambda locally in AWS workspace as I installed docker but AWS workspace does not allowed me to enabled virtualization. Is there other approach to test lambda locally?

[@punnarajeev867]

Hi nice videos bro I need one suggestion I am using AWS layer so I had one library need to convert into layer but it's size is around 660mb. But if I need to convert into layer it's support upto 250mb. then how do I make that 660mb file into layer and using it into aws lambda?

[@MarthinusRaath]

Thanks a lot for sharing. I have a problem though. For some reason I keep getting this: name 'NpipeHTTPAdapter' is not defined Would you mind sharing the exact versions of all the things you use? Eg: python, aws, sam, docker, pywin Seems like some dependency based on the results in google

[@ankushjain358]

Awesome

[@adamzerner5208]

Hm, why use SAM to do this instead of using a more traditional tool for unit testing like Jest?

[@nirmesh44]

i like the topic however i am getting error Could not find amazon/aws-sam-cli-emulation-image-nodejs12.x:rapid-1.23.0 image locally and failed to pull it from docker.