#env-var #env #env-file #environment #process #presence #system

bin+lib envful

A tool to verify the presence of environment variables before running a process

32 releases (7 stable)

1.0.7 Oct 19, 2022
1.0.6 Sep 29, 2022
1.0.2 Feb 28, 2022
0.5.12 Feb 7, 2022
0.1.0 Jan 22, 2022

#631 in Command line utilities

Download history 73/week @ 2024-02-22 12/week @ 2024-02-29

85 downloads per month

MIT license

766 lines


GitHub Workflow Status npm Crates.io

Envful is a CLI tool that verifies the presence of environment variables. It looks inside your .env file and the host system. You can use it to run any process while ensuring all the variables are set.

Never again waste time debugging your app because of a misconfigured environment.

Screen Shot 2022-01-23 at 10 13 06 p m


Installation script

Use the convenience install script that can run on all bash systems. Run the following command in your terminal (git bash for Windows).

# Warning: always examine scripts downloaded from the internet before running them locally.
curl https://raw.githubusercontent.com/arvindell/envful/main/install.sh -o install.sh && bash install.sh

This command can also be used to update your installation.


You can install Envful using NPM.

# Install locally
npm install envful

# Or globally
npm install -g envful


Install directly from crates.io using cargo.

cargo install envful


Envful uses the .env.example file as a manifest for which variables are needed. If your project has a .env.example it already supports envful! 🚀

Check for variables and undeclared variables using check:

envful check

You can also specify a command to run if check is successful using the '--' separator. It will immediately fail if a variable is missing, showing a helpful message.

envful -- echo "I am envful!"

This becomes very useful to check the environment inside package.json scripts:

"scripts": {
    "dev": "envful -- next",
    "build": "envful -- next build"



    -f, --file <FILE>            Path to environment file. Defaults to ./.env
    -h, --help                   Print help information
    -m, --manifest <MANIFEST>    Path to manifest file. Defaults to ./.env.example
        --show-optional          Whether to print missing optional variables. Defaults to false
        --show-undeclared        Whether to show undeclared variables in output. Defaults to false
    -V, --version                Print version information

    check    Check if env has all required variables and warns if missing
    help     Print this message or the help of the given subcommand(s)

How to declare variables

Inside your .env.example file, you can declare the variables that your application requires. You can use the triple hash marker (###) to add a description to the variable.

Add [optional] to a variable for warning instead of failing.


### The URL to the database instance

### The app secret used to sign JSON Web Tokens

### Google Analytics ID [optional]

Note: At the moment any ### marker will be intepreted as the comment for the next variable in the file, regardless of any whitespace between the two lines.

Contributions welcome

This project welcomes contributions of any kind, whether you want to add new features, improve the documentation or just want to give some feedback.


Envful is published under the MIT license. See the LICENSE file for more information.


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