convict
Featureful configuration management library for Node.js (nested structure, schema validation, etc.)
figue
Platform agnostic configuration management library, with environmental variables and validation, like convict but cross-env and zod schemas
envey
Type-safe configuration schemas for Node.js
defaulted
Manage config from environment variables with sensible defaults, with typing and validation.
config-srv
API and REST interface for editing a structured set of parameters