Directory

Open Source Packages

Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.

5929 packages

All Packages

94Health
SDK npm

AWS SDK for JavaScript (S3 Client)

The official modular AWS SDK v3 client for Amazon S3, with TypeScript-first APIs and streaming support.

3,666
Apache 2.0
Used by 129
51Health
Library npm

jsonwebtoken

The de facto Node.js library for signing, verifying, and decoding JSON Web Tokens.

18,196
MIT
Used by 93
89Health
Library npm

jose

Zero-dependency JWT, JWS, JWE, and JWK toolkit for Node.js, browsers, and edge runtimes.

7,792
MIT
Used by 66
67Health
Library Go

jwt

A zero-dependency Go implementation of JSON Web Tokens (JWT) with pluggable HMAC, RSA, RSA-PSS, ECDSA, and Ed25519 signing methods.

9,225
MIT
Used by 62
91Health
SDK PyPI

boto3

The official AWS SDK for Python — call every Amazon Web Services API from your code.

9,900
Apache 2.0
Used by 59
98Health
SDK npm

Google Cloud Storage

Node.js client library for Google Cloud Storage — upload, download, and manage buckets and objects programmatically.

3,195
Apache 2.0
Used by 59
51Health
Library npm

cookie-parser

Express middleware that parses HTTP Cookie headers into req.cookies, with support for signed and JSON-encoded cookie values.

2,030
MIT
Used by 52
56Health
Library npm

bcrypt.js

A zero-dependency, pure JavaScript implementation of bcrypt for hashing and verifying passwords in Node.js and the browser.

3,797
BSD 3
Used by 51
85Health
Library PyPI

PyJWT

A Python implementation of RFC 7519 for encoding, decoding, and verifying JSON Web Tokens.

5,700
MIT
Used by 44
95Health
SDK Go

AWS SDK for Go v2

The official AWS SDK for Go — type-safe, modular clients for every AWS service.

3,649
Apache 2.0
Used by 44
89Health
Framework npm

Better Auth

The most comprehensive, framework-agnostic authentication and authorization framework for TypeScript.

29,933
MIT
Used by 37
98Health
Library PyPI

google-auth

The foundational Python library for authenticating to Google Cloud and Google APIs with OAuth2, service accounts, and Application Default Credentials.

5,383
Apache 2.0
Used by 35
48Health
Library npm

bcrypt

Battle-tested password hashing for Node.js using the adaptive bcrypt algorithm.

7,803
MIT
Used by 34
97Health
SDK npm

google-api-nodejs-client

Google's officially supported Node.js client library for calling hundreds of Google APIs with built-in OAuth 2.0, API key, and service-account auth.

12,249
Apache 2.0
Used by 33
43Health
Library npm

passport

Simple, unobtrusive authentication middleware for Node.js with 480+ pluggable strategies.

23,530
MIT
Used by 31
64Health
Library npm

cookie

Basic HTTP cookie parser and serializer for HTTP servers, with zero dependencies and full RFC 6265 support.

1,534
MIT
Used by 31
85Health
Library npm

express-rate-limit

Basic IP rate-limiting middleware for Express to throttle repeated requests and protect public APIs and sensitive endpoints.

3,305
MIT
Used by 30
90Health
SDK npm

@cloudflare/workers-types

Official TypeScript type definitions for the Cloudflare Workers runtime, covering fetch handlers and platform bindings like KV, D1, R2, and Durable Objects.

8,727
Other
Used by 29
90Health
Library npm

Smithy Core (@smithy/core)

The shared runtime orchestration layer that powers every AWS SDK for JavaScript v3 client, unifying middleware, serialization, retries, and auth.

324
Apache 2.0
Used by 29
95Health
SDK npm

supabase-js

The official isomorphic JavaScript SDK for Supabase — database, auth, realtime, storage, and edge functions in one client.

4,562
MIT
Used by 28
73Health
Library Go

go-oidc

A Go client library for OpenID Connect, built on top of golang.org/x/oauth2.

2,479
Apache 2.0
Used by 28
97Health
SDK npm

@azure/identity

Microsoft Entra ID credential library that authenticates every Azure SDK client, from managed identity in production to CLI and browser login in development.

2,295
MIT
Used by 28
73Health
Library npm

NextAuth.js

Open-source authentication for Next.js with OAuth, OIDC, email, and passkey sign-in.

28,365
Other
Used by 26
89Health
SDK npm

Google Gen AI SDK

Google's official TypeScript/JavaScript SDK for building applications with the Gemini API and Vertex AI.

1,677
Apache 2.0
Used by 26

Join founders buildingwith open source

Opinionated takes, migration guides, cost-saving tips, and insights from the open source ecosystem.

Subscribe on Substack
Join 750+ subscribers