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reviewdog - A code review dog who keeps your codebase healthy.

LICENSE GoDoc releases Github All Releases

Travis Status CircleCI Status Coverage Status Stars

"reviewdog" provides a way to post review comments to code hosting service, such as GitHub, automatically by integrating with any linter tools with ease. It uses an output of lint tools and posts them as a comment if findings are in diff of patches to review.

reviewdog also supports run in the local environment to filter an output of lint tools by diff.

design doc

Table of Contents

github-pr-check sample comment in pull-request commit status sample-comment.png reviewdog-local-demo.gif


# Install latest version. (Install it into ./bin/ by default).
$ curl -sfL| sh -s

# Specify installation directory ($(go env GOPATH)/bin/) and version.
$ curl -sfL| sh -s -- -b $(go env GOPATH)/bin [vX.Y.Z]

# In alpine linux (as it does not come with curl by default)
$ wget -O - -q| sh -s [vX.Y.Z]


$ go get -u


You can also install it on MacOS using brew:

$ brew install reviewdog/tap/reviewdog
$ brew upgrade reviewdog/tap/reviewdog

Input Format


reviewdog accepts any compiler or linter result from stdin and parses it with scan-f like 'errorformat', which is the port of Vim's errorformat feature.

For example, if the result format is {file}:{line number}:{column number}: {message}, errorformat should be %f:%l:%c: %m and you can pass it as -efm arguments.

$ golint ./...
comment_iowriter.go:11:6: exported type CommentWriter should have comment or be unexported
$ golint ./... | reviewdog -efm="%f:%l:%c: %m" -diff="git diff master"
name description
%f file name
%l line number
%c column number
%m error message
%% the single '%' character
... ...

Please see reviewdog/errorformat and :h errorformat if you want to deal with a more complex output. 'errorformat' can handle more complex output like a multi-line error message.

By this 'errorformat' feature, reviewdog can support any tools output with ease.

Available pre-defined 'errorformat'

But, you don't have to write 'errorformat' in many cases. reviewdog supports pre-defined errorformat for major tools.

You can find available errorformat name by reviewdog -list and you can use it with -f={name}.

$ reviewdog -list
golint          linter for Go source code                                       -
govet           Vet examines Go source code and reports suspicious problems     -
sbt             the interactive build tool                                      -
$ golint ./... | reviewdog -f=golint -diff="git diff master"

You can add supported pre-defined 'errorformat' by contributing to reviewdog/errorformat

checkstyle format

reviewdog also accepts checkstyle XML format as well. If the linter supports checkstyle format as a report format, you can use -f=checkstyle instead of using 'errorformat'.

# Local
$ eslint -f checkstyle . | reviewdog -f=checkstyle -diff="git diff"

# CI (overwrite tool name which is shown in review comment by -name arg)
$ eslint -f checkstyle . | reviewdog -f=checkstyle -name="eslint" -reporter=github-pr-check

Also, if you want to pass other Json/XML/etc... format to reviewdog, you can write a converter.

$ <linter> | <convert-to-checkstyle> | reviewdog -f=checkstyle -name="<linter>" -reporter=github-pr-check

reviewdog config file

reviewdog can also be controlled via the .reviewdog.yml configuration file instead of "-f" or "-efm" arguments.

With .reviewdog.yml, you can run the same commands both CI service and local environment including editor integration with ease.


    cmd: <command> # (required)
    errorformat: # (optional if there is supporeted format for <tool-name>. see reviewdog -list)
      - <list of errorformat>
    name: <tool-name> # (optional. you can overwrite <tool-name> defined by runner key)

  # examples
    cmd: golint ./...
      - "%f:%l:%c: %m"
    cmd: go tool vet -all -shadowstrict .
$ reviewdog -diff="git diff master"
project/run_test.go:61:28: [golint] error strings should not end with punctuation
project/run.go:57:18: [errcheck]        defer os.Setenv(name, os.Getenv(name))
project/run.go:58:12: [errcheck]        os.Setenv(name, "")
# You can use -conf to specify config file path.
$ reviewdog -conf=./.reviewdog.yml -reporter=github-pr-check

Output format for project config based run is one of the following formats.

  • <file>: [<tool name>] <message>
  • <file>:<lnum>: [<tool name>] <message>
  • <file>:<lnum>:<col>: [<tool name>] <message>


reviewdog can report results both in local environment and review services as continuous integration.

Reporter: Local (-reporter=local) [default]

reviewdog can find newly introduced findings by filtering linter results using diff. You can pass diff command as -diff arg.

$ golint ./... | reviewdog -f=golint -diff="git diff master"

Reporter: GitHub Checks (-reporter=github-pr-check)

github-pr-check sample

github-pr-check reporter reports results to GitHub Checks. Since GitHub Checks API is only for GitHub Apps, reviewdog CLI send a request to reviewdog GitHub App server and the server post results as GitHub Checks.

  1. Install reviewdog Apps.
  2. Set REVIEWDOG_TOKEN or run reviewdog CLI in trusted CI providers.
  • Get token from{owner}/{repo-name}.
$ export REVIEWDOG_TOKEN="<token>"
$ reviewdog -reporter=github-pr-check

Note: Token is not required if you run reviewdog in Travis or AppVeyor.


As described above, github-pr-check reporter is depending on reviewdog GitHub App server. The server is running with haya14busa's pocket money for now and I may break things, so I cannot ensure that the server is running 24h and 365 days.

UPDATE: Started getting support by opencollective. See Supporting reviewdog

github-pr-check reporter is better than github-pr-review reporter in general because it provides more rich feature and has less scope, but please bear in mind the above caution and please use it on your own risk.

You can use github-pr-review reporter if you don't want to depend on reviewdog server.

Reporter: GitHub PullRequest review comment (-reporter=github-pr-review)


github-pr-review reporter reports results to GitHub PullRequest review comments using GitHub Personal API Access Token. GitHub Enterprise is supported too.

$ reviewdog -reporter=github-pr-review

For GitHub Enterprise, set API endpoint by environment variable.

$ export GITHUB_API=""
$ export REVIEWDOG_INSECURE_SKIP_VERIFY=true # set this as you need to skip verifying SSL

Reporter: GitLab MergeRequest discussions (-reporter=gitlab-mr-discussion)

gitlab-mr-discussion sample

Required GitLab version: >= v10.8.0

gitlab-mr-discussion reporter reports results to GitLab MergeRequest discussions using GitLab Personal API Access token. Get the token with api scope from

$ reviewdog -reporter=gitlab-mr-discussion

For self-hosted GitLab, set API endpoint by environment variable.

$ export GITLAB_API=""
$ export REVIEWDOG_INSECURE_SKIP_VERIFY=true # set this as you need to skip verifying SSL

Reporter: GitLab MergeRequest commit (-reporter=gitlab-mr-commit)

gitlab-mr-commit is similar to gitlab-mr-discussion reporter but reports results to each commit in GitLab MergeRequest.

gitlab-mr-discussion is recommended, but you can use gitlab-mr-commit reporter if your GitLab version is under v10.8.0.

$ reviewdog -reporter=gitlab-mr-commit

Supported CI services

Travis CI

Travis CI (-reporter=github-pr-check)

If you use -reporter=github-pr-check in Travis CI, you don't need to set REVIEWDOG_TOKEN.


  - mkdir -p ~/bin/ && export export PATH="~/bin/:$PATH"
  - curl -sfL| sh -s -- -b ~/bin

  - reviewdog -conf=.reviewdog.yml -reporter=github-pr-check

Travis CI (-reporter=github-pr-review)

Store GitHub API token by travis encryption keys.

$ gem install travis
$ travis encrypt REVIEWDOG_GITHUB_API_TOKEN=<token> --add


    - secure: <token>

  - mkdir -p ~/bin/ && export export PATH="~/bin/:$PATH"
  - curl -sfL| sh -s -- -b ~/bin

  - >-
    golint ./... | reviewdog -f=golint -reporter=github-pr-review


Circle CI

Store REVIEWDOG_TOKEN or REVIEWDOG_GITHUB_API_TOKEN in Environment variables - CircleCI

.circleci/config.yml sample

version: 2
      - image: golang:latest
      - checkout
      - run: curl -sfL| sh -s -- -b ./bin
      - run: go vet ./... 2>&1 | ./bin/reviewdog -f=govet -reporter=github-pr-check
      # or
      - run: go vet ./... 2>&1 | ./bin/reviewdog -f=govet -reporter=github-pr-review

GitLab CI


.gitlab-ci.yml sample

    - reviewdog -reporter=gitlab-mr-discussion
    # Or
    - reviewdog -reporter=gitlab-mr-commit

Common (Jenkins, local, etc...)

You can use reviewdog to post review comments from anywhere with following environment variables.

name description
CI_PULL_REQUEST Pull Request number (e.g. 14)
CI_COMMIT SHA1 for the current build
CI_REPO_OWNER repository owner (e.g. "haya14busa" for
CI_REPO_NAME repository name (e.g. "reviewdog" for
CI_BRANCH [optional] branch of the commit
$ export CI_PULL_REQUEST=14
$ export CI_REPO_OWNER=haya14busa
$ export CI_REPO_NAME=reviewdog
$ export CI_COMMIT=$(git rev-parse HEAD)

and set a token if required.


Jenkins with Github pull request builder plugin

$ export CI_PULL_REQUEST=${ghprbPullId}
$ export CI_REPO_OWNER=haya14busa
$ export CI_REPO_NAME=reviewdog
$ export CI_COMMIT=${ghprbActualCommit}
$ export REVIEWDOG_INSECURE_SKIP_VERIFY=true # set this as you need
$ REVIEWDOG_TOKEN="<token>" reviewdog -reporter=github-pr-check
# Or
$ REVIEWDOG_GITHUB_API_TOKEN="<token>" reviewdog -reporter=github-pr-review


🐦 Author

haya14busa GitHub followers



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