✌️dotenv-linter

Linter for .env files. Written in Rust 🦀

👨‍💻 Installation

Binary

# Linux
$ curl https://github.com/mgrachev/dotenv-linter/releases/download/v1.1.2/dotenv-linter-linux-x86_64.tar.gz -sSfL | tar -xzf - 

# Alpine Linux
$ wget https://github.com/mgrachev/dotenv-linter/releases/download/v1.1.2/dotenv-linter-alpine-x86_64.tar.gz -O - -q | tar -xzf -

# macOS
$ curl https://github.com/mgrachev/dotenv-linter/releases/download/v1.1.2/dotenv-linter-darwin-x86_64.tar.gz -sSfL | tar -xzf -

Homebrew / Linuxbrew

$ brew install mgrachev/tap/dotenv-linter

Arch Linux / AUR

# use your favourite AUR-helper
$ trizen -S dotenv-linter-bin # for the binary distribution
$ trizen -S dotenv-linter-git # for the current master branch

Docker

$ docker run --rm -v `pwd`:/app -w /app mgrachev/dotenv-linter

Cargo

If you are a Rust programmer, you can install dotenv-linter via cargo:

$ cargo install dotenv-linter

GitHub Action

Example: .github/workflows/dotenv_linter.yml

name: dotenv-linter
on: [pull_request]
jobs:
  dotenv-linter:
    name: runner / dotenv-linter
    runs-on: ubuntu-latest
    steps:
      - name: Check out code
        uses: actions/checkout@v1
      - name: dotenv-linter
        uses: mgrachev/action-dotenv-linter@v1
        with:
          github_token: ${{ secrets.github_token }}

In the example above, action-dotenv-linter is used to run dotenv-linter.

CircleCI

Example: .circleci/config.yml

version: 2.1
jobs:
  dotenv-linter:
    docker:
      - image: circleci/rust:latest
    steps:
      - checkout
      - run:
          name: Run dotenv-linter
          command: |
            DOTENV_LINTER_VERSION=v1.1.2
            wget https://github.com/mgrachev/dotenv-linter/releases/download/$DOTENV_LINTER_VERSION/dotenv-linter-alpine-x86_64.tar.gz \
            -O - -q | tar -xzf -
            ./dotenv-linter

🚀 Usage

By default, dotenv-linter checks all files that start and end with .env. For example: .env, test.env, .env.qa:

$ dotenv-linter
.env:1 Invalid leading character detected
.env:2 The FOO-BAR key has incorrect delimiter
.env:3 The FOo_BAR key should be in uppercase
.env:4 The line has spaces around equal sign
test.env:5 The foo_bar key should be in uppercase
test.env:6 The FOO key should be with a value or have an equal sign

If you want to include a file with a specific name to check, you can use the argument --include FILE_NAME or its short version -i FILE_NAME:

$ dotenv-linter -i test.dotenv .my-env-file
.env:1 Invalid leading character detected
test.dotenv:2 The FOO-BAR key has incorrect delimiter
.my-env-file:3 The line has spaces around equal sign

If you want to exclude a file with a specific name from check, you can use the argument --exclude FILE_NAME or its short version -e FILE_NAME:

$ dotenv-linter -e .env .env.test

If you want to specify the directory where to run dotenv-linter, you can use the argument --path DIRECTORY_PATH or its short version -p DIRECTORY_PATH:

$ dotenv-linter -p /directory/where/to/run

✅ Checks

Duplicated Key

Detects if a key is not unique:

❌Wrong
FOO=BAR
FOO=BAR

✅Correct
FOO=BAR
BAR=FOO

Incorrect delimiter

Detects if a key does not use an underscore to separate words:

❌Wrong
FOO-BAR=FOOBAR

✅Correct
FOO_BAR=FOOBAR

Keys without values

Detects if a line has a key without a value:

❌Wrong
FOO

✅Correct
FOO=

✅Correct
FOO=BAR

Leading character

Detects if a line starts with an unallowed character (characters from A to Z and _ (underscore) are allowed):

❌Wrong
 FOO=BAR

❌Wrong
.FOO=BAR

❌Wrong
*FOO=BAR

❌Wrong
1FOO=BAR

✅Correct
FOO=BAR

✅Correct
_FOO=BAR

Lowercase key

Detects if a key has lowercase characters:

❌Wrong
FOo_BAR=FOOBAR

❌Wrong
foo_bar=FOOBAR

✅Correct
FOO_BAR=FOOBAR

Space character

Detects lines with a whitespace around equal sign character =:

❌Wrong
FOO =BAR

❌Wrong
FOO= BAR

❌Wrong
FOO = BAR

✅Correct
FOO=BAR

Unordered Key

Detects if a key is not alphabetically ordered:

❌Wrong
FOO=BAR
BAR=FOO

✅Correct
BAR=FOO
FOO=BAR

📋 Roadmap

• Add more checks:
  • Duplicated key;
  • Incorrect delimiter;
  • Keys without values;
  • Leading character;
  • Lowercase keys;
  • Space character;
  • Unordered key;
• Support reviewdog;
• Create a GitHub Action for easily using dotenv-linter.

🤝 Contributing

If you've ever wanted to contribute to open source, now you have a great opportunity:

• How to set up the project
• How to add a new check

👍 Similar projects

• wemake-services/dotenv-linter (Python)

✨ Contributors

This project exists thanks to all the people who contribute. [Contribute].

♥️ Sponsors

📃 License

MIT