Documentation | dotenv-subst

A CLI tool and library for interpolating variables in any file, using .env files (or any key=value format) to define the replacement values.

Simple & Lightweight

Single-purpose no-fuss package, with no runtime dependencies besides Dotenvx.

Interpolates variables in any text-based static file (e.g. Markdown, JSON, YAML, etc.).

Supports multiple interpolation syntaxes and various CLI configuration options.

You can use it in scripts, pipelines, or as a library directly from your code.