dotenv-linter 2.0.0

Lightning-fast linter for .env files
Documentation

It checks .env files for problems that may cause the application to malfunction:

The key features:

Articles about dotenv-linter:

Dotenv-linter is created & supported by Evrone. What else we develop with Rust.

👨‍💻 Installation

Binary

# Linux
$ curl https://github.com/dotenv-linter/dotenv-linter/releases/download/v2.0.0/dotenv-linter-linux-x86_64.tar.gz -sSfL | tar -xzf -

# Alpine Linux
$ wget https://github.com/dotenv-linter/dotenv-linter/releases/download/v2.0.0/dotenv-linter-alpine-x86_64.tar.gz -O - -q | tar -xzf -

# macOS
$ curl https://github.com/dotenv-linter/dotenv-linter/releases/download/v2.0.0/dotenv-linter-darwin-x86_64.tar.gz -sSfL | tar -xzf -

Homebrew / Linuxbrew

$ brew install dotenv-linter/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 dotenvlinter/dotenv-linter

Cargo

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

$ cargo install dotenv-linter

GitHub Action

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: dotenv-linter/action-dotenv-linter@v1
        with:
          github_token: ${{ secrets.github_token }}

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

CircleCI

version: 2.1
jobs:
  dotenv-linter:
    docker:
      - image: circleci/rust:latest
    steps:
      - checkout
      - run:
          name: Run dotenv-linter
          command: |
            DOTENV_LINTER_VERSION=v2.0.0
            wget https://github.com/dotenv-linter/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 .env files in the current directory:

$ dotenv-linter
.env:2 DuplicatedKey: The FOO key is duplicated
.env:3 UnorderedKey: The BAR key should go before the FOO key
.env.test:1 LeadingCharacter: Invalid leading character detected

To check another directory, just pass its path as an argument. The same approach works if you need to check any files individually:

$ dotenv-linter dir1 dir2/.my-env-file
dir1/.env:1 LeadingCharacter: Invalid leading character detected
dir1/.env:3 IncorrectDelimiter: The FOO-BAR key has incorrect delimiter
dir2/.my-env-file:1 LowercaseKey: The bar key should be in uppercase

If you need to exclude a file from check, you can use the argument --exclude FILE_PATH or its short version -e FILE_PATH:

$ dotenv-linter --exclude .env.test
.env:2 DuplicatedKey: The FOO key is duplicated
.env:3 UnorderedKey: The BAR key should go before the FOO key

If you need to skip some checks, you can use the argument --skip CHECK_NAME or its short version -s CHECK_NAME:

$ dotenv-linter --skip UnorderedKey EndingBlankLine
.env:2 DuplicatedKey: The FOO key is duplicated

If you need to view all available checks, you can use the argument --show-checks:

$ dotenv-linter --show-checks
DuplicatedKey
EndingBlankLine
ExtraBlankLine
IncorrectDelimiter
KeyWithoutValue
LeadingCharacter
LowercaseKey
QuoteCharacter
SpaceCharacter
TrailingWhitespace
UnorderedKey

✅ Checks

Duplicated Key

Detects if a key is not unique:

❌ Wrong
FOO=BAR
FOO=BAR

✅ Correct
FOO=BAR
BAR=FOO

Ending Blank Line

Detects if a file doesn't have a blank line at the end:

❌ Wrong
FOO=BAR

✅ Correct
FOO=BAR

Extra Blank Line

Detects if a file contains more than one blank line in a row:

❌ Wrong
A=B


FOO=BAR

❌ Wrong
A=B
FOO=BAR



✅ Correct
A=B

FOO=BAR


✅ Correct
A=B
FOO=BAR

Incorrect delimiter

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

❌ Wrong
FOO-BAR=FOOBAR

✅ Correct
FOO_BAR=FOOBAR

Key without value

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

Quote character

Detects if a value is wrapped in quotes:

❌ Wrong
FOO="BAR"

❌ Wrong
FOO='BAR'

✅ Correct
FOO=BAR

Space character

Detects lines with a whitespace around equal sign character =:

❌ Wrong
FOO =BAR

❌ Wrong
FOO= BAR

❌ Wrong
FOO = BAR

✅ Correct
FOO=BAR

Trailing whitespace

Detects if a line has a trailing whitespace.

Unordered Key

Detects if a key is not alphabetically ordered:

❌ Wrong
FOO=BAR
BAR=FOO

✅ Correct
BAR=FOO
FOO=BAR

🤝 Contributing

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

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📃 License

MIT