Topic
Lambda
7 tutorials tagged Lambda.
AWS & Serverless
Full-text search on AWS with OpenSearch, Lambda and CDK (step by step)
Why DynamoDB can't do search, how an inverted index works, OpenSearch clusters, mappings and the Query DSL, multi_match search from a Lambda, and creating the index automatically with a CDK custom resource.
10 Nov 2026 · AWS · OpenSearch · Lambda
AWS & Serverless
How to build a YouTube-like video streaming backend on AWS (serverless architecture)
A complete serverless architecture for a video platform on AWS: API Gateway, Lambda, S3 presigned uploads, MediaConvert transcoding, EventBridge, DynamoDB and OpenSearch, deployed with CDK. The design behind the VidShare course.
10 Nov 2026 · AWS · Serverless · Architecture
AWS & Serverless
One Lambda or many? Building a REST API on API Gateway with a single CRUD handler
Should each HTTP method get its own Lambda function, or should one handler serve GET, POST, PUT and DELETE? How API Gateway's ANY method and Lambda proxy integration work, and how to branch on event.httpMethod in TypeScript.
10 Nov 2026 · AWS · Lambda · API Gateway
AWS & Serverless
S3 presigned URLs in TypeScript: upload large files straight from the browser
How S3 buckets and objects really work, then generate a presigned PUT URL with AWS SDK v3 in a Lambda, fix the 403 AccessDenied with the right IAM policy, and upload directly from the browser.
10 Nov 2026 · AWS · S3 · TypeScript
AWS & Serverless
Test-driven development for AWS Lambda with Jest: mocks and spies explained
Stop deploying to test. Write Lambda handlers test-first with Jest: the TDD loop, a to-do list per function, mocking the database with jest.spyOn and mockImplementation, and validating input with Zod. Real tests from the VidShare course.
10 Nov 2026 · AWS · Lambda · Jest
AWS & Serverless
Transcode video on AWS with MediaConvert, EventBridge and Lambda
How AWS Elemental MediaConvert jobs work (inputs, output groups, presets, IAM role), creating a job from Lambda with the AWS SDK v3, and reacting to job state changes with an EventBridge rule, all defined in CDK.
10 Nov 2026 · AWS · MediaConvert · EventBridge
AWS & Serverless
Trigger a Lambda on S3 upload and read video metadata with MediaInfo
Use S3 event notifications to run a Lambda on every upload, read the event's bucket and key, run the MediaInfo binary inside Lambda on a presigned URL, and decide transcoding resolutions. Wired up with AWS CDK.
10 Nov 2026 · AWS · S3 · Lambda
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