Deploy FastAPI on AWS Lambda | In 9 MINUTES

FastAPI has taken the Python community by storm with its high performance, ease of use, and automatic validation. In this super-condensed tutorial, we’re marrying FastAPI with the mighty AWS Lambda for serverless bliss!
🛠️ What You'll Learn 🛠️
✅ How to create a simple FastAPI application
✅ How to set up and configure AWS Lambda
✅ Deploying FastAPI on AWS Lambda
✅ Best practices and troubleshooting tips
⚡️Commands from the video:
1. pip3 install -t dependencies -r requirements.txt
2. (cd dependencies; zip ../aws_lambda_artifact.zip -r .)
3. zip aws_lambda_artifact.zip -u main.py
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===========================
🎓 Courses can be found:
FastAPI Beginner & Advanced: www.udemy.com/...
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===========================
🛒 GEAR & RECOMMENDED BOOKS: kit.co/codingw...
👨‍💻 Hi, I am Eric!👨‍💻
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#fastapi #lambda #python

[@tntmurphyfever]

Really great tutorial. Thank you so much for sharing. FYI - to people who may be reading the comments - if you setup your FastApi with .env locally and are running with dotenv, you will need to change all those os.getenv() to ENV_VAR = os.environ['NAME'] in lambda.

[@codingwithroby]

Thank you! Also I appreciate you dropping this to help other students 🙂

[@Loco-Poco]

I am getting "errorMessage": "Unable to import module 'main': No module named 'pydantic_core._pydantic_core'",

[@vini1520]

pip3 install -r requirements.txt --platform manylinux2014_x86_64 --target=dependencies --implementation cp --python-version 3.10 --only-binary=:all: --upgrade openai

[@vini1520]

try to use this command 🙂

[@deveshmishra6119]

Hey I'm getting the same problem how you resolved it?

[@simranverma7480]

@@deveshmishra6119 how can i resolve

[@marcoviera7120]

Include architecture in your pip install commands. e.g: pip install \ --platform manylinux2014_x86_64 \ --target=my-lambda-function \ --implementation cp \ --python-version 3.9 \ --only-binary=:all: --upgrade \ pandas

[@EdwardSapp]

What if you have multiple routers added to the main app and each router has several endpoints. Does this still work?

[@akcelero]

as far as I was able to check - yes works without any problem

[@zoroXgamings]

hi Eric, the way you shoed to deploy the code using zip looks easy , but in production and working in companies is there nay professional way like using docker or other so we can directly run some command in lambda to install the requirements

[@edwardwong654]

The Lambda function worked, but when I uploaded the zip file, I got an "internal server error" which I traced to "errorMessage": "Unable to import module 'main': No module named 'pydantic_core._pydantic_core' ". Any ideas?

[@sbussisodube1084]

had the same issue. I retried the video and this time I removed all dependencies in the requirements.txt file besides just fasapi and mangum after pip freeze > requirements.txt and it worked. video mark 1:04

[@sbussisodube1084]

package issue

[@mysteriousXsecret]

Any solution?

[@santoshturamari6741]

Thanks, it is a great tutorial. In a short video, you explained the process nicely.

[@codingwithroby]

Thank you!

[@6Diego1Diego9]

This actually worked, Gemini was giving me wrong information.

[@codingwithroby]

Eric > AGI

[@HashtagTiluda]

This is amazing! Was wondering, what if my FastAPI app has multiple folders and files? How should I create the artifact in that case?

[@codingwithroby]

You should still be able to do the exact same thing, but you will want to add the other files along with main.

[@rohanalmighty]

Great Video I'd recommend using the FastAPI version that is shown in this video, else things might not work, didn't work in my case. How do I set restrictions so that nobody can hit my api too many times and I get a bill sent by AWS.

[@codingwithroby]

If you want to add it in the code you can implement Rate Limiting. One of the most popular libraries for this is: pypi.org/project/ratelimiter/

[@willk7471]

Nice video. Is this something that will interact with a database as well?

[@codingwithroby]

Of course! You can do this exact same thing if you are using SQLite but if you are using a different type of database you just need to make sure all the connections are setup beforehand. If you need to see how to connect FastAPI to databases, I have multiple videos for different database you may find helpful 🙂

[@Welcomevideo-je3rm]

Fantastic tutorial! I really appreciate your work.

[@codingwithroby]

Woot Woot!

[@FatimaHABIB-jm4ji]

Thanks Eric for this great tutorial ; I have a question though; I could not install zip " × python setup.py egg_info did not run successfully. │ exit code: 1 ╰─> [9 lines of output]" I tried every possible solution proposed online; anyone have faced this error while installing this package ? Thanks

[@paulokuong]

Does this work with StreamingResponse?

[@andresguzman8816]

nice video, man, really helpful

[@codingwithroby]

Awesome! You are welcome

[@jorgesisco981]

Great video!, quick question: will I be able to use all the endpoints without setting them up in the api gateway?

[@johnhorton3727]

You can proxy all routes/methods to the lambda using {proxy+}

[@sachinsharma4539]

i followed your video and deploy code zip to lambda when i test i am getting error: "errorMessage": "Unable to import module 'main': No module named 'pydantic_core'"

[@KnightDark1233]

I'm having the same issue

[@zth-ue5oy]

did you solve this problem? I have the same issue

[@zth-ue5oy]

did you solve this problem? I have the same issue@@KnightDark1233

[@instructabuild]

I found a workaround to this issue, see my post from Feb 9, 2024 in comments. Hope it helps someone else too...

[@jdrcreations1947]

I get internal server error despite changing my handler details. What could be the reason

[@matthewmolinar]

same

[@slov1ker583]

Do I need to enable CORS for the fastAPI or when I deploy it on aws it will allow me to send external requests?

[@codingwithroby]

Most likely depending on what you are trying to achieve.

[@SylviaTran-u1c]

did you mean to delete `uvicorn` from the generated `requirements.txt` file? that came w/ the install of fastapi?

[@SylviaTran-u1c]

around 1'30" into the video

[@vini1520]

@@SylviaTran-u1c Below are my requirements fastapi==0.110.0 mangum==0.17.0

[@JarvisMillan]

how about larger files? i think you cant upload larger packaged .zip files.

[@codingwithroby]

For larger files you will probably not want to do a lambda, but instead use EC2 which I will eventually make a video on

[@tamaspleszkan6100]

Use lambda layers for dependencies. That way you also get the option to edit the code in the editor on the lambda page. If your lambda gets to the point where without dependencies it exceeds the lambda limit, you are packing too much stuff into it.

[@moverecursus1337]

Mount a EFS on a EC2, pip install --target with target to the EFS, delete ec2 instance, create a lambda with a mounting to the EFS and make PYTHONPATH as the local on efs you installed your dependencies. I am doing this for a segmentation model inference application

[@amliuyong]

you can use docker image as the run time code for AWS lambda

[@ragefurious5650]

this is dope but is there any way i could get the windows variation of some of these console lines?

[@codingwithroby]

Do the commands not work for Windows?

[@6Diego1Diego9]

they should work in Powershell

[@antonioclevenielsonvieirad2173]

hello my friend what theme are you using in vscode?

[@codingwithroby]

One Dark Pro - it is an theme that you need download!

[@AronBergara]

AMAZING tutorial! 👏

[@codingwithroby]

Glad you enjoyed it! Woot woot!

[@AronBergara]

I would like to host the frontend files on an S3 bucket, but I'm not finding any tips on how to make this work. Would you have any material on that?@@codingwithroby

[@AronBergara]

Well, just as I wrote the last comment I thought that I can just specify the S3 URL as path for the templates and it will load as if it were on the same local as the app (that in my case will be in lambda)

[@hemantsah8567]

Just curious. Knowing the functionality of Lambda that it is serverless(instances are spawned on request), should I still choose fastapi with Mangum or go with Chalice framework?

[@codingwithroby]

I see nothing wrong with using FastAPI with Mangum

[@thanhquachable]

what if we update our code ? we create and upload a new zip file?

[@codingwithroby]

Yes, in this video I didn't go over how to setup lambda deployments automatically. If you want to do this I'd look at GitHub actions to communicate to your lambda

[@thonnatigopi]

Kindly make a s3 uploads and trigger using lambda and fast api bro

[@codingwithroby]

I will add it to my backlog 🙂

[@thonnatigopi]

@@codingwithroby and also how to use custom packages like ffmpeg for audio conversation and others , to trigger lambda and use GPU , inhouse models like whisper model how to use them to trigger pls kindly make a video I'm eagerly waiting

[@thonnatigopi]

Use everything in vscode because cloud developers can't give credentials to developers in company, so kindly make a video for python automatic project in vscode and if possible dockerize integration deploy and aws lambda and Sam

[@טלפיזואטי]

great video , very high quality also

[@codingwithroby]

Much appreciated! I am glad you were able to get value 🙂

[@excuseop9339]

what if we have another folder . Do i need add folder using this "zip aws_lambda_artifact.zip -u folder_name"

[@codingwithroby]

Yup!

[@ptk6909]

This deployment on aws in this video free or not ? and also can open /docs or swagger ?

[@codingwithroby]

Yes (part of free tier) and yes 🙂

[@ptk6909]

@@codingwithroby I follow your video until deploy successful and open /docs swagger also successful. api can use complete But except api method post api must have parameter/data{} before excute after I input and press excute result error 504 ( This swagger from my code on local have no any problems )

[@shalineesharma8704]

Wow 🤩

[@zeki7540]

That's great!

[@codingwithroby]

Thanks! Glad you were able to find value :-)

[@athulkrishnadiyil1735]

mangum seems like no longer maitained ....?

[@codingwithroby]

It has not had a PR in awhile, but it is still widely used.

[@amarnathreddysurapureddy9111]

if i import some files from another file is it zip every thing

[@codingwithroby]

Yes, you would want to zip everything

[@amarnathreddysurapureddy9111]

@@codingwithroby file2.py imported into main.py then is it zip all files?

[@KTMedia-hx5gg]

the second command doesn't work in my end. It is giving 1. Missing closing ) in expression and 2. Unexpected token ) in expression or statement

[@codingwithroby]

Hmm, I just retried it and it is working correctly. Are you sure there is no typos?

[@KTMedia-hx5gg]

@@codingwithroby Yeah, I noticed it afterwards that I was using powerhell while you were in zsh. I had to use an alternative to that command for powershell

[@codingwithroby]

Do you mind sharing what the alternative command was?

[@willhg]

@@codingwithroby this is the command for VSCode powershell terminal : "Compress-Archive -Path . -destinationpath ../aws_lambda_artifact.zip"

[@eugeniosp3]

Easy easy sub. Nice job roby

[@codingwithroby]

Woot woot, thanks for the kind words 🙂

[@eugeniosp3]

@@codingwithroby do you have any info on how to access this from a client side call? Say I want to make a get request with a json payload how would i access this? Is it the function URL? Also what type of auth would it be?

[@scottzeta3067]

Once I tried to include another router in the main, Lambda keeps giving me internal server error

[@codingwithroby]

Interesting - what error are you getting?

[@scottzeta3067]

@@codingwithroby Timout Internal server error. I tried several tutorial I found, but only worked on "Hello World" level API. Once I started to apply some MVC structures, API runs well locally but failed when on Lambda. Since I am not an Fast API expert and lack of exp for cloud. I can not figure out where is the problem and how to solve it.

[@scottzeta3067]

@@codingwithroby I found if I compress everything into one file, no import from any source code file, it works. Not sure if this is Lambda's expectation.

[@esgosar]

Thanks!

[@codingwithroby]

You bet!

[@sulaiman.micheal]

Thanks. I appreciate this.

[@codingwithroby]

Glad it was helpful!

[@kzzz3]

mangum seems abandoned. Last commit was made almost a year ago

[@codingwithroby]

Yeah, but Mangum is still the best option for deploying FastAPI on lambdas. When a better handler comes out you can wrap app in it

[@CesarAugustoPerezTafur]

Hi, How are you? first thank you for the tutorial, second, i have troblue when test de app in aws, it still show Internal server Error message, although i edited Handler in console. i wrote main.handler. the only ting that i made differenet was replace this command lines 2. (cd dependencies; zip ../aws_lambda_artifact.zip -r .) 3. zip aws_lambda_artifact.zip -u main.py for Compress-Archive dependencies/*.* lambda_function2.zip and Compress-Archive main.py -update aws_lambda_artifact.zip Could you help me?

[@SoulCTO]

You need to debug to see what is happening. Maybe it is some incompatibility between lib version supported by aws lambda. What you can try to do is in your requirements.txt, force the version of fast api to 0.99.0 (fastapi==0.99.0) and remove the version of pydantic and pydantic core (so it will get the correct one. When you run locally with uvicorn you will find the right version). This happened to me in another project and might fix the issue.

[@codingwithroby]

For the time being, I found the best FastAPI version to be 0.99.0

[@CesarAugustoPerezTafur]

Thanks all for the answer. I solve the problem changing the py lance versión, i mafe a video in spanish with the solution kzbin.info/www/bejne/fIbWe6CChJd6asksi=z-mQPlbBjFde_3g0

[@CesarAugustoPerezTafur]

@@codingwithroby hi, I deployed my api with mysql in lambda but not all of them work, only the delete one and the query by user_id work. vbx54teybuuh3rvjyss67x3j740mnyft.lambda-url.us-east-2.on.aws/docs. could you help me

[@honchan83]

@@SoulCTO Thank you so much for leaving this comment, I have spent days to figure out what goes wrong. AWS won't give us that much hints to fix the problem. I did not realise it is the fastapi version that making things to fail.

[@JackLogan90]

Nice!

[@codingwithroby]

Thank you! Cheers!

[@amarnathreddysurapureddy9111]

I am getting Internal Server Error After followed,

[@pedroalbertorojasvalladare260]

Me too, did you fix that?

[@amarnathreddysurapureddy9111]

@@pedroalbertorojasvalladare260 kzbin.info/www/bejne/i5LYfoR9psarfdE. I Used CI/CD Piples of Github.

[@amarnathreddysurapureddy9111]

@@pedroalbertorojasvalladare260 If you want upload more than 2.4 GB Lambda function won't work.

[@pedroalbertorojasvalladare260]

@@amarnathreddysurapureddy9111 thanks, I deployed my API on render it's more easily

[@c4rb0n5]

Check endpoint url and cors maybe

[@conadeanzola]

Why would you deploy FastAPI on top of Lambda instead of using API Gateway and Lambda functions that run only the required logic? It's like forcing a use case in a service that is not designed for that purpose.

[@Krow-n3o]

In my company, we are migrating from fastapi HTTP microservices to lambda sqs oriented, and this can help to do the transition slowly without too much rework.

[@conadeanzola]

@@Krow-n3o but Lambda already handles the request when you invoke it and then pass the parameters to the logic, why would you need a rest framework in that case instead of just receiving the request via the native method in Lambda ?

[@Krow-n3o]

@@conadeanzola i agree with you, you don't need to.

[@pushkarkathayat7893]

The only issue is their cold start

[@SajanKumar-mx2jg]

Magnum is not maintained so I don't we should use it.

[@codingwithroby]

As of right now though it is a wrapper that doesn"t need maintained (as of now).

[@adamrichic8753]

Very well, thanks a lot

[@codingwithroby]

You are welcome!

[@hmp3854]

Thanks!

[@codingwithroby]

Hey - thank you so much!