Open-source alternatives to Config

envconfig is a Go configuration decoder and environment variable mapper that deserializes environment variables into structured Go data types. It provides tools for validating mandatory fields and ensuring application configuration adheres to the external configuration patterns of twelve-factor app compliance. The library features a help generator that creates formatted usage text based on struct definitions to describe expected environment variables. It also includes a validation tool capable of detecting unused environment variables that match a specific prefix but do not correspond to any

Hjson for Go

koanf is a configuration management library for Go designed to load, merge, and unmarshal application settings from multiple sources into structured objects. It functions as a multi-source config loader that aggregates data from environment variables, files, and remote providers into a single unified map. The system utilizes a pluggable architecture for parsing and data abstraction, allowing it to transform bytes from formats such as JSON, YAML, and TOML into nested maps. It supports dynamic configuration watching to monitor external sources and trigger automatic reloads when settings change.

Library providing routines to merge and validate JSON, YAML and/or TOML files

Small library to read your configuration from environment variables

Package ini provides INI file read and write functionality in Go

env is a Go library that reads environment variables and populates the fields of a Go struct according to tag directives. It uses reflection to iterate over struct types and tags at runtime, mapping environment variable names to struct fields and applying parsing behavior defined in struct tags. The library supports required field validation, returning errors when marked fields are missing or empty after parsing. It also provides default value fallback from struct tags when environment variables are not set, environment variable expansion that recursively substitutes references within values,

Viper is a configuration management library designed to centralize application settings from diverse sources into a unified, type-safe registry. It aggregates data from local files, environment variables, command-line flags, and remote key-value stores, providing a single source of truth for application state. By utilizing a hierarchical key-value registry, the system resolves configuration values based on a prioritized stack of providers, ranging from default values to runtime overrides. The library distinguishes itself through its pluggable provider abstraction and dynamic update capabiliti

Golang packages for writing small daemons and servers.

Load configuration in cascade from multiple backends into a struct

Harvest configuration, watch and notify subscriber

Container-focused Golang config: unify Env & Flag parsing in one call with minimal code and zero dependencies.

Layer based configuration for golang

Structured data format to config struct decoder library for Go

High-performance configuration management framework for Go applications with zero-allocation performance, universal format support (JSON, YAML, TOML, HCL, INI, Properties), and an ultra-fast CLI powered by Orpheus.

Vault provides centralized, well-audited privileged access and secret management for mission-critical data whether you deploy systems on-premises, in the cloud, or in a hybrid environment.

go implementation of lightbend's HOCON configuration library https://github.com/lightbend/config

HashiCorp Consul is a service networking solution that enables teams to manage secure network connectivity between services and across on-prem and multi-cloud environments and runtimes. Consul offers service discovery, service mesh, traffic management, and automated updates to network…

Sonic is a high-performance Go JSON serialization library that provides tools for encoding and decoding native data structures. It functions as a JIT-accelerated encoder, a JSON AST parser, a stream processor, and a lazy decoder. The project utilizes just-in-time machine code generation to optimize the encoding of large data schemas and employs a JIT assembler to maximize serialization and deserialization speeds. It features a precompiled schema warmup process to prevent latency spikes during initial execution and leverages SIMD hardware instructions for accelerated parsing. The library cove

Zero-effort, concise configuration management that avoids boilerplate and repetitive actions.

A lightweight yet powerful configuration manager for the Go programming language

Go implementation of the XDG Base Directory Specification and XDG user directories

Parse configuration values into given struct from environment, files, json, bytes, or other input convertible to bytes