go-dev

Opinionated Go development setup with golangci-lint v2, gofumpt, gotestsum, golang-migrate, and just. Use when creating a new Go project, setting up linting, formatting, testing, or coverage, configuring a Go CI pipeline, writing a Justfile, wiring database migrations, or migrating from a Makefile-only workflow.

Go Development Stack

Opinionated, modern Go development setup. One tool per concern, zero overlap.

When to Use

• Starting a new Go project from scratch
• Adding linting, formatting, or testing infrastructure
• Setting up CI/CD for a Go service or library
• Creating a Justfile to replace a Makefile
• Adding database migration tooling
• Migrating from scattered gofmt/govet/staticcheck invocations to a unified setup

The Stack

Tool	Version	Role	Replaces
Go	1.27+	Language, toolchain, go mod, go fix	-
golangci-lint	v2.13+	Meta-linter (100+ linters + formatters + fmt command)	gofmt, govet, staticcheck, errcheck run separately
gofumpt	v0.11+	Strict formatter (superset of gofmt, 19 default rules)	gofmt
gotestsum	v1.13+	Test runner with readable output, watch mode, JUnit XML	Raw go test
just	1.58+	Task runner	Makefile
golang-migrate	v4.19+	DB migrations (CLI + library + embed.FS)	Manual SQL scripts
lefthook	v2.1+	Git hooks (single binary, parallel)	pre-commit (Python)

Version floors are load-bearing. golangci-lint "supports Go versions lower or equal to the Go version used to compile it" - a pin older than your Go toolchain fails outright. Go 1.27 support landed in golangci-lint v2.13.0, so v2.13 is the floor for a Go 1.27 project.

Quick Start: New Project

bash

# 1. Create module
mkdir myapp && cd myapp
go mod init github.com/yourorg/myapp

# 2. Scaffold directories
mkdir -p cmd/myapp internal migrations

# 3. Track tools in go.mod (Go 1.24+ tool directive). Pin versions - never @latest,
#    which recompiles the tool on every CI run and drifts between machines.
go get -tool github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.13.1
go get -tool mvdan.cc/gofumpt@v0.11.0
go get -tool gotest.tools/gotestsum@v1.13.0

# golang-migrate needs a build tag, so install it directly
go install -tags 'postgres' github.com/golang-migrate/migrate/v4/cmd/migrate@v4.19.1

# 4. Create config files (templates below)
# 5. Run: just check

go get -tool tracks; go tool runs. The tool directive records the dependency in go.mod but puts nothing on your PATH. Either invoke through the toolchain - go tool golangci-lint run ./..., go tool gotestsum --format testname - or go install tool once to populate $(go env GOPATH)/bin. The Justfile below calls the bare binaries, so it assumes the go install tool route (or a system install via Homebrew).

Two Go-command behaviours worth knowing before the first commit:

• go mod init under a 1.N toolchain writes go 1.(N-1).0, not 1.N - "Running go mod init using a toolchain of version 1.N.X will create a go.mod file specifying the Go version go 1.(N-1).0." Bump the directive deliberately if you want 1.N language features.
• Pin the toolchain for reproducibility with a toolchain go1.27.0 line in go.mod (or GOTOOLCHAIN=go1.27.0 in CI). This line is also what govulncheck compares stdlib advisories against - see Footguns below.

.golangci.yml

yaml

version: "2"

run:
  timeout: 5m

linters:
  default: standard
  enable:
    - bodyclose
    - copyloopvar
    - dupl
    - durationcheck
    - err113
    - errname
    - errorlint
    - exhaustive
    - exptostd
    - fatcontext
    - goconst
    - gocritic
    - gosec
    - intrange
    - misspell
    - modernize
    - musttag
    - nakedret
    - nestif
    - nilerr
    - noctx
    - nolintlint
    - nonamedreturns
    - perfsprint
    - prealloc
    - revive
    - sqlclosecheck
    - testifylint
    - thelper
    - unconvert
    - unparam
    - usestdlibvars
    - usetesting
    - wastedassign
    - whitespace
    - wrapcheck
  settings:
    govet:
      enable:
        - shadow
    gocritic:
      enabled-checks:
        - nestingReduce
    revive:
      enable-all-rules: true
    errcheck:
      check-type-assertions: true
  exclusions:
    generated: strict
    presets:
      - comments
      - std-error-handling
      - common-false-positives
    rules:
      - path: _test\.go
        linters:
          - gocyclo
          - errcheck
          - dupl
          - gosec
          - wrapcheck

formatters:
  enable:
    - gofumpt
    - goimports
  settings:
    gofumpt:
      extra-rules: true
  exclusions:
    generated: strict
    paths:
      - vendor/

output:
  formats:
    text:
      path: stdout
      print-linter-name: true
      colors: true
  sort-order:
    - linter
    - file
  show-stats: true

Justfile

just

set shell := ["bash", "-euo", "pipefail", "-c"]
set dotenv-load := true

binary := "myapp"

[private]
default:
    @just --list --unsorted

# ── Code Quality ──────────────────────────────────────────

# Format all Go code
[group('quality')]
fmt:
    golangci-lint fmt ./...

# Check formatting without modifying (CI-safe)
[group('quality')]
fmt-check:
    golangci-lint fmt --diff ./...

# Run linter
[group('quality')]
lint:
    golangci-lint run ./...

# Run linter with auto-fix
[group('quality')]
lint-fix:
    golangci-lint run --fix ./...

# Run vulnerability check
[group('quality')]
vuln:
    govulncheck ./...

# ── Testing ───────────────────────────────────────────────

# Run all tests with race detection
[group('test')]
test *args="./...":
    gotestsum --format testname -- -race {{ args }}

# Run tests with coverage
[group('test')]
test-cov:
    gotestsum --format testname -- -race -coverprofile=coverage.out -covermode=atomic ./...
    go tool cover -func=coverage.out

# Open coverage report in browser
[group('test')]
coverage: test-cov
    go tool cover -html=coverage.out

# Run integration tests
[group('test')]
test-integration:
    gotestsum --format testname -- -race -tags=integration ./...

# Watch tests during development
[group('test')]
test-watch:
    gotestsum --watch --watch-clear --format testname

# Run benchmarks
[group('test')]
bench:
    go test -bench=. -benchmem ./...

# ── Build ─────────────────────────────────────────────────

# Build the binary
[group('build')]
build:
    go build -o {{ binary }} ./cmd/{{ binary }}

# Build optimized release binary
[group('build')]
build-release:
    CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o {{ binary }} ./cmd/{{ binary }}

# ── Dependencies ──────────────────────────────────────────

# Tidy and verify modules
[group('deps')]
tidy:
    go mod tidy
    go mod verify

# Run code generators
[group('deps')]
generate:
    go generate ./...

# ── Database ──────────────────────────────────────────────

# Apply all pending migrations
[group('db')]
migrate-up:
    migrate -path migrations -database "$DATABASE_URL" up

# Revert last migration
[group('db')]
migrate-down:
    migrate -path migrations -database "$DATABASE_URL" down 1

# Create a new migration
[group('db')]
migrate-create name:
    migrate create -ext sql -dir migrations -seq {{ name }}

# ── CI ────────────────────────────────────────────────────

# Full CI gate (format check + lint + test)
[group('ci')]
check: fmt-check lint test
    @echo "All checks passed"

# Clean build artifacts
[group('ci')]
clean:
    go clean
    rm -f {{ binary }} coverage.out

Lefthook Config

Lefthook is preferred over pre-commit for Go projects - it is a single Go binary, runs hooks in parallel, and needs no Python.

bash

go install github.com/evilmartians/lefthook/v2@v2.1.11
lefthook install

yaml

# lefthook.yml
pre-commit:
  piped: true   # run sequentially: fmt -> lint -> mod-tidy (each may modify staged files)
  commands:
    fmt:
      glob: "*.go"
      run: gofumpt -w {staged_files}
      stage_fixed: true
    lint:
      glob: "*.go"
      run: golangci-lint run --fix {staged_files}
      stage_fixed: true
    mod-tidy:
      glob: "*.{go,mod,sum}"
      run: go mod tidy

pre-push:
  commands:
    test:
      run: go test -race ./...

jobs: is lefthook v2's newer primitive and supersedes the commands:/scripts: split - "Jobs provide a flexible way to define tasks, supporting both commands and scripts. Jobs can be grouped for advanced flow control." The commands: form above still works; reach for jobs: when you need grouping, nested control flow, or a mix of inline commands and scripts in one hook.

Two more worth wiring:

• lefthook validate in CI catches a malformed lefthook.yml before it silently disables hooks; lefthook dump prints the merged effective config when a hook does not behave as written.
• A gitignored lefthook-local.yml lets a developer add or skip jobs without imposing it on teammates - "This is useful when you want to use lefthook locally without imposing it on your teammates."

Project Structure

text

myapp/
  cmd/
    myapp/
      main.go              # Wire deps, call Run(), nothing else
  internal/
    user/                  # Domain logic, one package per domain
      user.go
      user_test.go
      repository.go
    transport/             # HTTP/gRPC handlers
    storage/               # Database layer
  migrations/
    000001_create_users.up.sql
    000001_create_users.down.sql
  testdata/                # Test fixtures (ignored by go toolchain)
  .golangci.yml
  lefthook.yml
  Justfile
  go.mod
  go.sum
  Dockerfile

Guidelines:

• cmd/ - one directory per binary, keep main.go thin (~50 lines max)
• internal/ - all business logic goes here (compiler-enforced, cannot be imported externally)
• pkg/ - only add when another repo actually imports it today, not "maybe someday"
• testdata/ - test fixtures, golden files, fuzz corpus
• migrations/ - SQL migration files (timestamp or sequential versioned)

Daily Workflow

bash

just fmt          # Format code
just lint         # Run linter
just test         # Run tests with race detection
just check        # Full CI gate (fmt-check + lint + test)
just test-watch   # Watch mode during development
just generate     # Run go generate
just tidy         # go mod tidy + verify

go fix is the toolchain-native complement to the modernize linter: Go 1.26 rebuilt it as a codebase modernizer - "The venerable go fix command has been completely revamped and is now the home of Go's modernizers. It provides a dependable, push-button way to update Go code bases to the latest idioms and core library APIs." Run go fix ./... after a toolchain bump, before the linter has to complain.

Footguns

Six failure modes that cost real debugging time, none of which produce an obvious error message.

Config placement is load-bearing. .golangci.yml must sit at the repo root: golangci-lint searches the working dir and its parents, and editor Go plugins auto-detect only a root .golangci.*, so filing it under .github/ costs in-IDE linting even if you pass --config. lefthook auto-discovers only the repo root or .config/ - move lefthook.yml anywhere else and commits silently stop running hooks, because git invokes the hook directly and no task-runner recipe can intercept that.

lefthook is dormant until installed. The binary being absent from PATH, or lefthook install never having run, both present as "hooks just don't fire" with no warning. Pin lefthook as a repo tool and make lefthook install part of onboarding.

A stale lint cache invents issues. golangci-lint can report failures in files that no longer exist on disk - typically after a branch switch or a deleted worktree. If issue counts look impossible, run golangci-lint cache clean before debugging the code. When several worktrees share a checkout, give each its own cache with GOLANGCI_LINT_CACHE=<worktree>/.golangci-cache.

Don't run two formatters against one gate. Standalone gofumpt -w and golangci-lint fmt do not always agree on the same file, so a repo that fixes with one and gates with the other fails CI on code it just formatted. Pick one as both fixer and gate - the Justfile above uses golangci-lint fmt for both.

A pinned linter older than your Go toolchain fails outright. This is the same trap as the version floor above, and it usually surfaces first as a config-schema rejection: a config authored against a newer golangci-lint hits additional properties ... not allowed under the pinned CI version. Bump the CI pin and the local install together.

govulncheck fails on stdlib advisories, not just your code. Advisories are matched against the toolchain line in go.mod, so a lagging toolchain red-lights CI on commits that touch zero Go code - and a failed test-and-lint job typically skips the release job downstream. When govulncheck reports vulnerabilities "in the Go standard library" all marked fixed in a patch you don't have, the fix is bumping the toolchain, not editing code.

CI/CD Pipeline (GitHub Actions)

yaml

name: Go CI
on:
  push:
    branches: [main]
  pull_request:

permissions:
  contents: read

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
      - uses: actions/setup-go@v7
        with:
          go-version: stable
      - uses: golangci/golangci-lint-action@v9
        with:
          version: v2.13

  test:
    runs-on: ubuntu-latest
    needs: lint
    strategy:
      matrix:
        go-version: [stable, oldstable]
    steps:
      - uses: actions/checkout@v7
      - uses: actions/setup-go@v7
        with:
          go-version: ${{ matrix.go-version }}
      - run: go install gotest.tools/gotestsum@v1.13.0
      - name: Test
        run: gotestsum --format github-actions --junitfile unit-tests.xml -- -race -coverprofile=coverage.out -covermode=atomic ./...
      - uses: actions/upload-artifact@v7
        if: always()
        with:
          name: test-results-${{ matrix.go-version }}
          path: unit-tests.xml

  security:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v7
      - uses: actions/setup-go@v7
        with:
          go-version: stable
      - run: go install golang.org/x/vuln/cmd/govulncheck@v1.7.0
      - run: govulncheck ./...

Existing Project Migration

bash

# 1. Install tools
go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.13.1
go install mvdan.cc/gofumpt@v0.11.0
go install gotest.tools/gotestsum@v1.13.0

# 2. Migrate existing golangci-lint v1 config
golangci-lint migrate

# 3. Format codebase
gofumpt -w .

# 4. Run linter (fix what you can, nolint the rest)
golangci-lint run --fix ./...

# 5. Replace go test with gotestsum in scripts/CI
# Before: go test -v ./...
# After:  gotestsum --format testname -- -race ./...

# 6. Copy Justfile and lefthook.yml templates above
# 7. Run: just check

For incremental adoption on large codebases, use only-new-issues: true in the GitHub Action to only lint changed code. Outside the Action, --new-from-merge-base=main and --new-from-rev=<rev> do the same locally - see the golangci-lint Reference for the full set.

Expect new findings after a toolchain bump: since Go 1.27, "go test now invokes the stdversion vet check by default. This reports the use of standard library symbols that are too new for the Go version in force in the referring file". Adjust the go directive or the call site rather than suppressing it.

Adjacent Tools

Not part of the core stack, but the gaps most projects fill next:

Need	Tool	Why
Structured logging	log/slog (stdlib)	The default since Go 1.21; the sloglint linter enforces a consistent call style
Hot reload for a running service	air or wgo	just test-watch covers tests; neither go run nor gotestsum restarts a server on save
Release binaries + changelog	GoReleaser	Cross-compile, checksum, sign, and publish from one config
Type-safe SQL from schema	sqlc	Generates Go from the same SQL your migrations define, so storage/ stays hand-written-free

Reference Docs

• golangci-lint Reference - v2 config, linter catalog, recommended sets, nolint syntax
• gofumpt Reference - formatting rules, editor integration, golangci-lint integration
• gotestsum Reference - output formats, watch mode, JUnit XML, CI recipes
• Go Testing Reference - table-driven tests, mocking, benchmarks, coverage, fuzz testing
• golang-migrate Reference - CLI, library, embed.FS, transactions, pitfalls
• Justfile Reference - Go-specific recipes, task groups, lefthook integration

Resources

• Go Official Docs
• golangci-lint Docs
• gofumpt
• gotestsum
• golang-migrate
• Lefthook
• just
• govulncheck
• Go 1.27 Release Notes
• Go Release History