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:
dotenv-linter alternatives and similar packages
Based on the "Testing" category.
Alternatively, view dotenv-linter alternatives based on common mentions on social networks and blogs.
-
Testcontainers-scala
DISCONTINUED. The project repository has moved to https://github.com/testcontainers/testcontainers-scala
CodeRabbit: AI Code Reviews for Developers

* Code Quality Rankings and insights are calculated and provided by Lumnify.
They vary from L1 to L5 with "L5" being the highest.
Do you think we are missing an alternative of dotenv-linter or a related project?
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:
- [EN] Dotenv-linter: looking after the environment for you
- [EN] What's new in dotenv-linter v2.2.0?
- [EN] What are the key changes in dotenv-linter v3.0.0 release?
- [RU] Dotenv-linter: линтер .env файлов
- [RU] Что нового в dotenv-linter v2.2.1?
- [RU] Что нового в dotenv-linter v3.0.0?
👨💻 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. 🤗
🤝 Contributing
If you've ever wanted to contribute to open source, now you have a great opportunity:
👍 Similar projects
- wemake-services/dotenv-linter (Python)
✨ Contributors
This project exists thanks to all the people who contribute. [Contribute].
♥️ Sponsors
dotenv-linter is created & supported by Evrone. What else we develop with Rust.
Become a financial contributor and help us sustain our community.
📃 License
*Note that all licence references and agreements mentioned in the dotenv-linter README section above
are relevant to that project's source code only.