spf13/viper

Health v2 · maintenance only

Adoption not part of the score

30475 stars · 2281 forks observed · 2026-09-29

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

Viper is a comprehensive configuration library for Go applications that reads from files, environment variables, command-line flags, and remote key-value stores like Etcd and Consul. It supports defaults, key aliasing, and live watching of configuration changes, serving as a central registry for all app configuration needs.

Use cases

• manage configuration for a go application
• read config from yaml json and toml files
• load settings from environment variables
• watch config files for live changes
• merge configuration from multiple sources
• read remote config from consul or etcd
• build 12-factor apps in go

When to choose

• you need a unified configuration solution across files, env vars, flags, and remote stores in Go
• you want live config reloading without restarting your app
• you need support for many config file formats out of the box

When to avoid

• you need only simple single-file config parsing and want a minimal dependency
• you are not writing Go
• you need strongly typed config validation beyond what Viper offers

Facets

library · maturity stable

configuration-management developer-tools developer-tools backend apis go cross-platform config-files environment-variables 12-factor-apps live-reload yaml json toml consul etcd

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