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☁️ Live reload for Go apps



When I get started with developing websites in Go and gin framework, it’s a pity that gin lacks live-reloading function. In fact, I tried fresh and it seems not much flexible, so I intended to rewrite it in a better way. Finally, Air’s born. In addition, great thanks to pilu, no fresh, no air ?

Air is yet another live-reloading command line utility for Go applications in development. Just air in your project root directory, leave it alone, and focus on your code.

NOTE: This tool has nothing to do with hot-deploy for production.


  • Colorful log output
  • Customize build or binary command
  • Support excluding subdirectories
  • Allow watching new directories after Air started
  • Better building process



# binary will be $(go env GOPATH)/bin/air
curl -sSfL | sh -s -- -b $(go env GOPATH)/bin

# or install it into ./bin/
curl -sSfL | sh -s

air -v

P.S. Great thanks mattn’s PR for supporting Windows platform.

Via go install

With go 1.16 or higher:

go install


Please pull this docker image cosmtrek/air.

docker run -it --rm \
    -w "<PROJECT>" \
    -e "air_wd=<PROJECT>" \
    -v $(pwd):<PROJECT> \
    -c <CONF>

For example, one of my project runs in docker:

docker run -it --rm \
    -w "/go/src/" \
    -v $(pwd):/go/src/ \
    -p 9090:9090 \


For less typing, you could add alias air='~/.air' to your .bashrc or .zshrc.

First enter into your project

cd /path/to/your_project

The simplest usage is run

# firstly find `.air.toml` in current directory, if not found, use defaults
air -c .air.toml

You can initialize the .air.toml configuration file to the current directory with the default settings running the following command.

air init

After this you can just run the air command without additional arguments and it will use the .air.toml file for configuration.


For modifying the configuration refer to the air_example.toml file.

Runtime arguments

You can pass arguments for running the built binary by adding them after the air command.

# Will run ./tmp/main bench
air bench

# Will run ./tmp/main server --port 8080
air server --port 8080

You can separate the arguments passed for the air command and the built binary with -- argument.

# Will run ./tmp/main -h
air -- -h

# Will run air with custom config and pass -h argument to the built binary
air -c .air.toml -- -h


    image: cosmtrek/air
    # working_dir value has to be the same of mapped volume
    working_dir: /project-package
      - <any>:<any>
      - ENV_A=${ENV_A}
      - ENV_B=${ENV_B}
      - ENV_C=${ENV_C}
      - ./project-relative-path/:/project-package/


air -d prints all logs.


“command not found: air” or “No such file or directory”

export GOPATH=$HOME/xxxxx
export PATH=$PATH:$GOROOT/bin:$GOPATH/bin
export PATH=$PATH:$(go env GOPATH)/bin <---- Confirm this line in you profile!!!


Please note that it requires Go 1.16+ since I use go mod to manage dependencies.

# 1. fork this project

# 2. clone it
mkdir -p $GOPATH/src/
cd $GOPATH/src/
git clone [email protected]:<YOUR USERNAME>/air.git

# 3. install dependencies
cd air
make ci

# 4. explore it and happy hacking!
make install

BTW: Pull requests are welcome~

Release new version

# 1. checkout to master
git checkout master

# 2. add the version that needs to be released
git tag v1.xx.x

# 3. push to remote
git push origin v1.xx.x

the ci will processing and will release new version,wait about 5 min you can fetch the new version.


Buy Me A Coffee

Huge thanks to the following supporters. I’ve always been remembering your kindness.

  • Peter Aba
  • Apostolis Anastasiou
  • keita koga


GNU General Public License v3.0


View Github