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A Clojure library designed to make working with environment variables easier.


You'll need Java 8 and Leiningen.


Going from 2.0.* to 3.0.*

Don't use parse-* any more -- there are clojure.core alternatives now

Replace spec->docs with display-spec->docs

Going from 1.0.* to 2.0.*

For security purposes, we have made masking of value display the default behavior. If you want to see the value of a variable, simply add :masked? false to everything that you don't want to mask.


Say you want to define a binding in a namespace that is filled in by the value specified in an environment variable. Here's the very simplest way to do it:

(require '[defenv.core :refer [defenv]])

(defenv path)

Then, if you run @path you will see the value of the PATH environment variable.

Also, you could try running DEFENV_TESTING=bob lein usage

Questions I imagined you might ask

Why does `defenv` make delayed bindings?

Well, the project contains a bit of other magic. If you don't make a binding to a variable optional, an exception will be thrown when it is dereferenced if it isn't set. We don't want these exceptions to be thrown during compile time. Therefore, they must be delayed.

Why can't I load property files and declare multiple
environments in my `project.clj` and stuff?

This library was designed for apps


Copyright © 2023 Stephen Starkey

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <>.