middyjs/middy

Health v2 · maintenance only

Adoption not part of the score

3903 stars · 398 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Middy is a Node.js middleware engine for AWS Lambda that lets developers attach modular, reusable middlewares (before/after/onError phases) around their Lambda handlers. It bundles a small core with many official middlewares for parsing, validation, auth, secrets fetching, observability, and error handling.

Use cases

• parse JSON bodies in Lambda API Gateway handlers
• validate Lambda event and response payloads with JSON Schema
• verify JWTs on incoming HTTP requests in Lambda
• fetch secrets from Secrets Manager or SSM in Lambda handlers
• add CORS and security headers to Lambda HTTP responses
• log Lambda input/output and errors for observability
• reduce boilerplate in serverless Lambda functions

When to choose

• you write AWS Lambda functions in Node.js and want clean separation of business logic from cross-cutting concerns
• you want off-the-shelf middlewares for API Gateway, JWT auth, validation, and AWS secrets
• cold-start size and performance matter and you want a minimal, opt-in middleware core

When to avoid

• your Lambda functions are in Python, Go, or another non-Node.js runtime
• you run Express or another full web server rather than Lambda handlers
• you need a general-purpose web framework with routing rather than a middleware engine

Facets

framework · maturity stable

middleware web-framework form-handling serialization logging auth caching cloud-computing backend developer-tools apis serverless cloud aws-lambda middleware-engine serverless-framework cold-start jwt secrets-manager ssm api-gateway serverless nodejs

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