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Description

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

✅Duplicated Key ✅Incorrect delimiter ✅Key without value ✅Leading character ✅Lowercase key ✅Quote character (Will be available in v2.0.0) ✅Space character ✅Unordered Key

The key features:

⚡️Lightning-fast because it is written in Rust 🦀 💣Can be used on any project regardless of the programming language 💥 🚀Can be integrated with reviewdog and other CI services (including GitHub Actions) 🔥

Articles about dotenv-linter:

Programming language: Rust

License: MIT License

Tags: Miscellaneous Linter Environment Env Dotenv Code Quality Tools Lint

Latest version: v3.2.0

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README

⚡️Lightning-fast linter for .env files. Written in Rust 🦀

dotenv-linter can [check](#-check) / [fix](#-fix) / [compare](#-compare) .env files for problems that may cause the application to malfunction.

Available checks:

✅ Duplicated Key ✅ Ending Blank Line ✅ Extra Blank Line ✅ Incorrect delimiter ✅ Key without value ✅ Leading character ✅ Lowercase key ✅ Quote character ✅ Space character ✅ Substitution Key ✅ Trailing whitespace ✅ Unordered Key

What is a .env file?

💡 A .env file or dotenv file is a simple text file containing all the environment variables of a project. Storing configuration in the environment variables is one of the tenets of the Manifesto of Twelve-Factor App. The .env file has a simple key-value format, for example: FOO=BAR. More information you can find in articles in English and Russian.

The key features:

⚡️ Lightning-fast because it is written in Rust 🦀 💣 Can be used on any project regardless of the programming language 💥 🚀 Can be integrated with reviewdog and other CI services (including GitHub Actions and Super-Linter) 🔥

Articles about dotenv-linter:

👨‍💻 Installation

Pre-compiled binary

```shell script

Linux / macOS / Windows (MINGW and etc). Installs it into ./bin/ by default

$ curl -sSfL https://raw.githubusercontent.com/dotenv-linter/dotenv-linter/master/install.sh | sh -s

Or a shorter way

$ curl -sSfL https://git.io/JLbXn | sh -s

Specify installation directory and version

$ curl -sSfL https://git.io/JLbXn | sh -s -- -b usr/local/bin v2.0.0

Alpine Linux (using wget)

$ wget -q -O - https://git.io/JLbXn | sh -s


You can find other installation methods here: https://dotenv-linter.github.io/#/installation

## 🚀 Usage

#### ✅ Check

By default, `dotenv-linter` checks all `.env` files in the current directory:

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

Checking .env.test
.env.test:1 LeadingCharacter: Invalid leading character detected

Found 3 problems

🛠 Fix

It can also fix the found warnings with the fix command:

$ dotenv-linter fix
Fixing .env
Original file was backed up to: ".env_1601378896"

.env:2 DuplicatedKey: The BAR key is duplicated
.env:3 LowercaseKey: The foo key should be in uppercase

All warnings are fixed. Total: 2

🤲 Compare

In addition, dotenv-linter can compare .env files with each other and output the difference between them:

$ dotenv-linter compare .env .env.example
Comparing .env
Comparing .env.example
.env is missing keys: BAR
.env.example is missing keys: FOO

Other use cases you can find on the documentation site (https://dotenv-linter.github.io):

🚦 Continuous Integration

dotenv-linter can also be used with CI services such as: GitHub Actions and Circle CI.

🚧 Benchmark

Benchmarking dotenv-linter/dotenv-linter and wemake-services/dotenv-linter has done using the hyperfine utility:

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`dotenv-linter/dotenv-linter .env`	2.7 ± 0.4	2.0	4.3	1.00
`wemake-services/dotenv-linter .env`	162.6 ± 12.1	153.0	201.3	60.83 ± 10.20

Content of .env file used for benchmarking

 SPACED=

KEY = VALUE

SECRET="my value"

SECRET=Already defined

kebab-case-name=1
snake_case_name=2

✌️ Mentorship

dotenv-linter is not just a linter for .env files — it is also a contributor-friendly open-source project with the purpose of helping others learn Rust using a simple, but useful tool. 😊

In addition to studying Rust, this project has another goal — to promote love for open-source, help you with the first steps in it and give an opportunity to contribute to the open-source project written in Rust. ❤️

We act as a mentor within this project and help developers follow the path of a novice contributor from start to the top. 🤗