AWS API Gateway to Lambda Tutorial in Python | Build a REST API

[@BeABetterDev]

Looking to become an expert on AWS Lambda? Check out my new course: AWS Lambda - A Practical Guide www.udemy.com/course/aws-lambda-a-practical-guide/?referralCode=F6D1A50467E579C65372

[@Venkat28s]

Sorry this Course is not available in udemy. :)

[@AlvinC-sz3li]

As an AWS engineer I have to say, very good tutorial video. Why such a channel only has 21k sub??? For begineers, your videos are better than our official ones.

[@santhoshinfo]

Thanks for your support . The subscribe count jump to 53k+ ...👍

[@jasper5016]

Now its 117K. Super fast.

[@nikhilsingh7165]

now its 149k

[@ZachDTravels]

254k 😮

[@ymahtab]

@@ZachDTravels subs, not views

[@geodezix]

get this ...{"transactionId": "5", "transactionType": "'PURCHASE'", "transactionAmount": "500", "message": "xyz says HELLO"} .... finally understand what api gateway/lambda is doing....great job AWS Simplified!

[@BeABetterDev]

Great to hear I was able to help!

[@BilalAhmed-nt9gi]

This dude is way more Good then actual AWS guys. And video is super sharp to the point (Y) Loved it

[@BeABetterDev]

Thank you so much for your kind words!

[@kono163]

Great tutorial! this is just memo for other beginners. ●can't test in lambda console? try something like this ↓ { "queryStringParameters":{ "transactionId": "5", "type": "purchase", "amount": "100" } } ●internal server error? you need equal in line 25 ↓ responseObject['headers'] = {} and check typos . Thanks!

[@BeABetterDev]

Thank you for the catch!

[@faithinverity8523]

Wow. Short, complete, accurate and useful. You are remarkably good at making instructional videos. Thank you.

[@BeABetterDev]

Thanks for the kind words Faithin!

[@learndevtech]

This is the best exemplification I have ever seen so far. I could not find any other resources better than this channel.

[@kishor777]

I love 10 mins tutorial and this one is perfect 10 min tutorial. Thanks.

[@BeABetterDev]

Thanks so much kishor!

[@dileepdamodaran5573]

No stories , to the point , Thank you ! Subscribed

[@BeABetterDev]

Thanks dileep! And welcome to the channel :)

[@richard_franks]

Thanks a ton for your tutorial here. I just needed a quick rundown and this is exactly what I needed. Quick and concise.

[@BeABetterDev]

Glad it helped!

[@heikg]

Love this video. If only they gave examples like that in the official documentation, instead of just dry theory

[@BeABetterDev]

Thanks for the kind words heikg. I'm glad you found it helpful :)

[@TheLostBijou]

It could use updating, as AWS has changed its API Gateway UI substantially. GREAT WORK, THANKS!

[@BeABetterDev]

Thanks for pointing this out Kent! Time for a new video :)

[@TheLostBijou]

Go for it! If you need any help, I volunteer!

[@hhhhhhhhhhhhhhhh3484]

Great tutorial. Explained better than even AWS official ones. One suggestion: Next time show how you debug the error also. I get that you use cloud trail here but it'll still be useful to newcomers

[@BeABetterDev]

Thank you Harsha for the kind words and the feedback!

[@timothyle4820]

@@BeABetterDev What was the fix to that error anyway?

[@mrrobot6320]

Short and Simple. Best tutorials. Keep Teaching :). Thank you

[@BeABetterDev]

You are very welcome!

[@praveendumpala5672]

It was great to see and understand the basic flow with API Gateway + Lambda, thanks.

[@BeABetterDev]

Glad it was helpful!

[@vojtechkaiser2525]

Great work! Appreciate you showing the event structure right at the beginning which is usually skipped by many.

[@WesDoyle]

Great video! Thanks for demonstrating API Gateway + Lambda integration

[@BeABetterDev]

Glad you enjoyed Wes.

[@erikngigi]

Excellent Tutorial. I'm currently learning how to use AWS Lambda and AWS API gateway to create a serverless USSD with Africa's Talking using python. Ideally I want to automate the entire process using Terraform.

[@vu3gwn]

Good one. To the point. Simple. Best way to dive in.

[@BeABetterDev]

Thanks Prasad!

[@parthapaul1249]

Thanks a lot🙏🙏 Before watching this, I watched a couple of videos on lambda function, but still I couldn't understand what the hell lambda function is, you made it very clear...

[@vladventura1928]

Man but like how good is this video?? You're insane! Thanks a lot! I was looking for something like this for a small learning project I have in mind with flutter and aws (just to learn aws because tbh its pretty daunting to me). Thanks a lot again!!

[@BeABetterDev]

Thank you so much for such a kind comment, I really appreciate it!

[@branstark3622]

Great video, no only this but all the others in the channel too. I dont like the sounds with the mouth when starting new words, but anyway best AWS channel in youtube so far.

[@BeABetterDev]

Thanks for the feedback!

[@jiyongwang2459]

Great tutorial. Helped me on how to handle event with python. I am using a Lambda function to perform Geocode and REST API for client to invoke the API

[@BeABetterDev]

Glad it helped Jiyong!

[@philipackerley5775]

Superb intro to using the API gateway, good tutoring skills!

[@BeABetterDev]

Thanks phillip!

[@davidk7212]

Very efficient, straight to the point, extremely helpful. Thank you.

[@phen2841]

What a fantastic tutorial! Great job!

[@BeABetterDev]

Thank you! Cheers!

[@musejama8684]

Thank you bro for keeping it clean and simple. I love it.

[@BeABetterDev]

Thanks Muse! Really appreciate the kind words.

[@SabbirAhmed-ev4rz]

thanks man for this amazing video it helped me in completing my internship task keep up the good work

[@humayunakhtar9515]

Amazingly great and simple to get point. Salute

[@BeABetterDev]

Thank you so much for your kind words!

[@kyleesposito6672]

OMG, thank you sooooo much for this video!!! Building a simple website for my wedding in a few months and wanted to be able for folks to RSVP online and the data loaded to a dynamoDB server to keep everything organized. Spent literally all day yesterday going thru guides and documentation with no success. Would just be curious if you would need to do anything differently for a post method instead of get. Web design is not my forte, which is why I wanted this project to challenge myself. Thanks again!!!

[@BeABetterDev]

Hi Kyle! Thanks for watching and congratulations on your wedding. I'm also getting married soon and hope you're able to have a happy day despite covid. In terms of your question, the only difference is that you would select the POST method during the api creation in API gateway. Also, the location of the parameters being passed into your lambda function will change (they will likely no longer be in the query param's field, but instead in the 'body'). The quickest way to find out where is just to console.log the input object (event) and find out where in the object the param's are being passed. Hope this helps and feel free to reach out if you have any followup Q's.

[@tekken-pakistan2718]

dude this is literally really simplified, thank you so much

[@BeABetterDev]

Glad you liked it!

[@hasmize]

Thanks man. I am new to Cloud but somehow I managed to secure somewhat senior position as AWS DevOps Engineer and now facing the music. I came across a similar requirement, Thanks for the help Sir

[@morenoaf]

Great explanation

[@BeABetterDev]

Glad it was helpful!

[@liochon4417]

to-the-point. Thx. Keep up the good work!

[@BeABetterDev]

Thanks Lio!

[@andressapatanga9481]

Gracias, me has salvado la vida compadre, desde Ecuador.

[@BeABetterDev]

Thanks Andres!

[@st3114rr]

Thanks so much for this awesome tutorial! Really clear and well-paced.

[@BeABetterDev]

You're very welcome!

[@marco114]

Thanks for the tutorial. This helped me resolve an error I was getting.

[@BeABetterDev]

Glad it helped!

[@felixvanderspek1293]

a cool little trick to use if you want to print a variable name and its value is to do (with transaction_id as example): print(f'{transaction_id=}')

[@BeABetterDev]

Thanks for this cool tip Felix!

[@taekhwanoh4268]

When I go to url, it only shows me the message which is "Hello from Lambda!" instead of showing all the json. Does anyone know how to fix this?

[@rkumarjay]

thanks. simple enough to get started with API gateway and integration points

[@didismit1766]

Wow, everything I needed put together in one video!! Thanks alot bro!

[@BeABetterDev]

You are very welcome didi!

[@arunelangovan7222]

Well Explained. Simply Awesome. :)

[@BeABetterDev]

Thanks a lot 😊

[@ajith_e]

Simple and Effective, as always!!

[@nitesh2k6]

Woow it is very nice explanation with example .. it help me to understand API with Lambda.. Thanks

[@BeABetterDev]

You are most welcome

[@legoman01]

Good tutorial. Tested and it works

[@amitkarmakar6418]

Best Tutorial. You made it so simple. Thank You

[@ashokgVideo]

To the point video. Appreciate it.

[@BeABetterDev]

Glad it was helpful!

[@zrqx]

That was a concise tutorial. Thank you

[@sanrise27]

Great stuff!! Thanks a lot for the overview!!👍🏼

[@BeABetterDev]

Thanks sanket!

[@xammocoloniax]

As others already mentioned --- what's the fix for the line 25 syntax error that you said you'd get back to?

[@vijay3107]

Wow wow wow, made it very easy and understandable. thanks

[@BeABetterDev]

You are welcome 😊

[@rahulmarkonda]

Nice and fast. Thanks.

[@BeABetterDev]

You're very welcome Raul!

[@squirrel1620]

In our use case, we built an API Gateway to call a collection of microservices, from lambda(new code) & HTTP (legacy code). It works well, but I'd advise anyone working on a serverless architecture to look into how to keep lambdas "warm"

[@BeABetterDev]

Good advice Derek, Provisioned Concurrency is a life saver!

[@Hackenbaker]

Very well explainations. Good for a starting point. Thanks a lot.

[@geostrategicinsights6801]

Thank you so much! This was tremendously helpful!

[@BeABetterDev]

You're so welcome!

[@gordonbrown3716]

NIce tutorial on api and lamda function

[@BeABetterDev]

Thanks Gordon!

[@beatalert123]

Awesome video..!! I am planning to create ETL data pipes using lambda + API gateway and then use step functions or MWAA to orchestrate the Lambda.

[@reddylakshmi8071]

Really ur videos r so good

[@BeABetterDev]

Thank you so much 😀

[@sateeshkumarchillakuru4222]

Let me try ,..happy to get this video

[@BeABetterDev]

Thanks Sateesh. Were you able to create your API?

[@vanmathivelmurugan1814]

I am using the same code that yu gave .. but facing key error. Error: { "errorMessage": "'queryStringParameters'", "errorType": "KeyError", "stackTrace": [ [ "/var/task/lambda_function.py", 9, "lambda_handler", "transactionId = event['queryStringParameters']['transactionId']" ] ] } Input: transactionId=1&type=abc&amount=123

[@cstanleyhns]

Well presented. Would be good to see the API Gateway raise an event to Event bridge and then Event bridge match to the Lambda and return the same way.

[@paulking1796]

Thanks a lot, this was really helpful!!!!! Have a nice day :)

[@BeABetterDev]

You're very welcome paul, and you too!

[@samjones4327]

Excellent tutorial! Thank you very much! I am enjoying your channel a lot. I'm just starting out with AWS but I'm super curious about how things work and you're becoming my one stop shopping channel! Cheers!

[@shraddhasable5416]

thanks for sharing...it was really helpful.

[@BeABetterDev]

You're very welcome

[@gopalakrishnanp2046]

Great explanation and good demo

[@kashif3683]

Wow! It was simple! Thanks.

[@BeABetterDev]

Glad it helped!

[@devprakash5320]

very well explained . Thanks for the video

[@sachinpc702]

Great job with the video

[@BeABetterDev]

Thanks!

[@vpshibin]

Great video. One small point. You mentioned about a syntax error in line 25, but doesn’t address that later in the video.

[@timothyle4820]

What was the actual fix to that error anyway?

[@ymahtab]

@@timothyle4820 he missed out an equals character before the empty dictionary. I think he simply fixed it off screen.

[@arunshankars8398]

@@timothyle4820 Just add the = symbol before the {}

[@zhongdaochen8221]

Fantastic video, many thanks!

[@joedunder4439]

Thanks! Very helpful.

[@BeABetterDev]

You're welcome!

[@mustaphag]

Excellent work

[@BeABetterDev]

Thank you! Cheers!

[@franktumminello9166]

Great video!

[@TomerBenDavid]

Splendid 👌more videos please

[@BeABetterDev]

Coming soon!

[@Bigshotdata]

Great video super insightful thanks!

[@aleandromatteoni2462]

By the way, watch out for the number of connections to your database if your rest api is getting a lot of traffic, they generate a new connection for each request, wich could stop you from access the databasw

[@vijeandran]

Nice video

[@BeABetterDev]

Thank you!

[@alaaeddinekolli4178]

Magnifique ! thanks for this tutorial

[@go_sh4627]

I love this, this is very straight forward. But as a beginner in the field of AWS I just want a clarification. The method you used, why GET and not POST method?

[@filetranscribe]

Thank you for this one

[@jasper5016]

Thanks so much.

[@BeABetterDev]

You're welcome!

[@ladynobug8759]

Thanks, great content!

[@BeABetterDev]

Thanks no bug!

[@ladynobug8759]

@@BeABetterDev 😆

[@sraj7284]

Hi, Thank you, this de-mystified some of the profoundness of the topic! Very well structured and explained... What is throwing me off, is whether there is a standard structure protocol for the event[] object? Similarly, why cant a straighforward JSON response be sent over through the lambda? Again, is there a standard structure for this responseObject[]? How and where is this responseObject declared? Why can't the lamda return something like so: return { 'statusCode': 200, 'body': json.dumps('Hello from Lambda!'), 'Name1':event['queryStringParameters']['param1'] 'Name2':event['queryStringParameters']['param2'] }

[@ardikasulistija6574]

Getting the following error when I tested the lambda function (without using the API gateway endpoint): { "errorMessage": "'queryStringParameters'", "errorType": "KeyError", "stackTrace": [ [ "/var/task/lambda_function.py", 7, "lambda_handler", "transactionId = event['queryStringParameters']['transactionId']" ] ] Any insight on how to fix this? Not sure how everyone is able to use the same code... Seems like there is an issue with the code itself.

[@BeABetterDev]

Hi there, have you tried to print out the event that has been passed into the lambda function to see if the input contains query string parameter's. It seems like your functions code is trying to access that field but it is not present in the event. One other possibility is that you created a post API instead of a GET API. This will result in the payload been inside the body of the request instead of query string parameter's. Hope this helps.

[@Esamabdelhadi1982]

for some reason i'm getting this error { "message": "Missing Authentication Token" } im not sure what im doing wrong, but i followed the step by step instructions

[@egehanyorulmaz4965]

Straight to the point. Thank you. I was wondering how we could add an authentication to the request as well. My request returns Missing Authentication Token. I don't want to make the API public as it is sending a separate request to a paid API.

[@kathirjay9168]

Informative video : how about also including how to troubleshoot errors . Get a "message" : "Internal server error" when hitting the API URL

[@OakZ-sr9by]

I keep getting an error on line 7... I am using the exact same code from the repo import json print('Loading function') def lambda_handler(event, context): #1. Parse out query string params transactionId = event['queryStringParameters']['transactionId'] transactionType = event['queryStringParameters']['type'] transactionAmount = event['queryStringParameters']['amount'] print('transactionId=' + transactionId) print('transactionType=' + transactionType) print('transactionAmount=' + transactionAmount) #2. Construct the body of the response object transactionResponse = {} transactionResponse['transactionId'] = transactionId transactionResponse['type'] = transactionType transactionResponse['amount'] = transactionAmount transactionResponse['message'] = 'Hello from Lambda land' #3. Construct http response object responseObject = {} responseObject['statusCode'] = 200 responseObject['headers'] = {} responseObject['headers']['Content-Type'] = 'application/json' responseObject['body'] = json.dumps(transactionResponse) #4. Return the response object return responseObject Response { "errorMessage": "'queryStringParameters'", "errorType": "KeyError", "requestId": "095f8e51-982c-4621-956d-2032446286da", "stackTrace": [ " File \"/var/task/lambda_function.py\", line 7, in lambda_handler transactionId = event['queryStringParameters']['transactionId'] " ] }

[@blessyRelatable]

Thank you

[@BeABetterDev]

You're very welcome manasa!

[@denizbalc8685]

Youre great person thanks for help

[@BeABetterDev]

Happy I could help!

[@user-ki6fo3um1k]

Can someone please explain how the output that was returned (in the browser) was formatted with a : following the transactionID, type, amount and message and a " " surrounding 5, PURCHASE, 500 and Hello from Lambda land ? I don't see any formatting in the code related to the formatting in the output. transactionID: "5" type: "PURCHASE" amount: "500" message: "Hello from Lambda land" Thank you in advance.

[@InfantGerald]

Thanks

[@BeABetterDev]

Thank you so much for your generosity!

[@najamhaq]

One thing, you can improve on is to show entire text editor window, on full screen, zoomed in. While editor window is in focus, as @2:58 , we don't need to see the background window. The reason it matters is that people watch this from variety of different screen sizes, and it helps to see text in large fonts.

[@BeABetterDev]

Very good tip Muhammad. I've actually started doing this in some of my more recent videos :)

[@EdeYOlorDSZs]

Cool video but I get an internal server error saying it doesn't recognise 'queryStringParameters' I have no idea how to fix it after a few hours

[@BeABetterDev]

Hi there, did you use a GET method ?

[@jorgeluishernandez7964]

good video, thank you so much.

[@BeABetterDev]

Glad you liked it!

[@whchi9252]

nice video, thanks

[@marcelogrsp]

I think there is a typo in responseObject[‘headers’] {}

[@bradchellingworth2002]

Very nice tutorial. New subscriber here :)

[@BeABetterDev]

Thanks Brad! Welcome to the channel :)

[@dineshdixit3306]

I have to create a REST Api using lambda. The lambda function has to complete does two tasks 1. Verify OKTA JWT token 2. Make connection to Database and run a query and return result in JSON format. Here Creating New DB connection each request takes time. How to resolve this issue.

[@eliasperez5168]

That’s some serious coding I have to get better at it