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:
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⚡️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:
```shell script
$ curl -sSfL https://raw.githubusercontent.com/dotenv-linter/dotenv-linter/master/install.sh | sh -s
$ curl -sSfL https://git.io/JLbXn | sh -s
$ curl -sSfL https://git.io/JLbXn | sh -s -- -b usr/local/bin v2.0.0
$ 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
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
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):
dotenv-linter can also be used with CI services such as: GitHub Actions and Circle CI.
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
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. 🤗
If you've ever wanted to contribute to open source, now you have a great opportunity:
This project exists thanks to all the people who contribute. [Contribute].
dotenv-linter is created & supported by Evrone. What else we develop with Rust.
Become a financial contributor and help us sustain our community.
*Note that all licence references and agreements mentioned in the dotenv-linter README section above
are relevant to that project's source code only.
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