diff --git a/.golangci.yml b/.golangci.yml
index 34fe368..deed852 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -75,6 +75,9 @@ issues:
     - source: "`json:"
       linters:
         - lll
+    - source: "`yaml:"
+      linters:
+        - lll
 
 run:
   skip-dirs:
diff --git a/pkg/cli/plan.go b/pkg/cli/plan.go
index 32df157..cfae4c2 100644
--- a/pkg/cli/plan.go
+++ b/pkg/cli/plan.go
@@ -1,6 +1,7 @@
 package cli
 
 import (
+	"fmt"
 	"os"
 	"path/filepath"
 
@@ -37,6 +38,12 @@ func planCmd() *cli2.Command {
 				Name:  "sha",
 				Usage: "override commit SHA of specified git branch/tag",
 			},
+			&cli2.StringFlag{
+				Name:    "format",
+				Aliases: []string{"f"},
+				Usage:   "output format of build plan (yaml or json)",
+				Value:   "yaml",
+			},
 			&cli2.StringFlag{
 				Name: "output",
 				Usage: "output filename to write plan to instead of printing " +
@@ -102,7 +109,18 @@ func planAction(c *cli2.Context, opts *Options) error {
 		return err
 	}
 
-	planYAML, err := p.YAML()
+	format := c.String("format")
+	var plan string
+	switch format {
+	case "yaml", "yml":
+		format = "yaml"
+		plan, err = p.YAML()
+	case "json":
+		format = "json"
+		plan, err = p.JSON()
+	default:
+		err = fmt.Errorf("--format must be yaml or json")
+	}
 	if err != nil {
 		return err
 	}
@@ -111,7 +129,7 @@ func planAction(c *cli2.Context, opts *Options) error {
 	out = os.Stdout
 	if f := c.String("output"); f != "" {
 		logger.Info("writing plan", "file", f)
-		logger.Debug("content", "yaml", planYAML)
+		logger.Debug("content", format, plan)
 		out, err = os.Create(f)
 		if err != nil {
 			return err
@@ -119,7 +137,7 @@ func planAction(c *cli2.Context, opts *Options) error {
 		defer out.Close()
 	}
 
-	_, err = out.WriteString(planYAML)
+	_, err = out.WriteString(plan)
 	if err != nil {
 		return err
 	}
diff --git a/pkg/commit/commit.go b/pkg/commit/commit.go
index f7d4b79..673386c 100644
--- a/pkg/commit/commit.go
+++ b/pkg/commit/commit.go
@@ -8,11 +8,11 @@ import (
 )
 
 type Commit struct {
-	SHA       string     `yaml:"sha"`
-	Date      *time.Time `yaml:"date"`
-	Author    string     `yaml:"author"`
-	Committer string     `yaml:"committer"`
-	Message   string     `yaml:"message"`
+	SHA       string     `yaml:"sha" json:"sha"`
+	Date      *time.Time `yaml:"date" json:"date"`
+	Author    string     `yaml:"author" json:"author"`
+	Committer string     `yaml:"committer" json:"committer"`
+	Message   string     `yaml:"message" json:"message"`
 }
 
 func New(rc *github.RepositoryCommit) *Commit {
diff --git a/pkg/osinfo/osinfo.go b/pkg/osinfo/osinfo.go
index e8bca96..e801117 100644
--- a/pkg/osinfo/osinfo.go
+++ b/pkg/osinfo/osinfo.go
@@ -6,9 +6,9 @@ import (
 )
 
 type OSInfo struct {
-	Name    string `yaml:"name"`
-	Version string `yaml:"version"`
-	Arch    string `yaml:"arch"`
+	Name    string `yaml:"name" json:"name"`
+	Version string `yaml:"version" json:"version"`
+	Arch    string `yaml:"arch" json:"arch"`
 }
 
 func New() (*OSInfo, error) {
diff --git a/pkg/plan/plan.go b/pkg/plan/plan.go
index 333da67..7d119e2 100644
--- a/pkg/plan/plan.go
+++ b/pkg/plan/plan.go
@@ -2,6 +2,7 @@ package plan
 
 import (
 	"bytes"
+	"encoding/json"
 	"io"
 	"os"
 
@@ -11,11 +12,11 @@ import (
 )
 
 type Plan struct {
-	Build   *Build         `yaml:"build,omitempty"`
-	Source  *source.Source `yaml:"source,omitempty"`
-	OS      *osinfo.OSInfo `yaml:"os,omitempty"`
-	Release *Release       `yaml:"release,omitempty"`
-	Output  *Output        `yaml:"output,omitempty"`
+	Build   *Build         `yaml:"build,omitempty" json:"build,omitempty"`
+	Source  *source.Source `yaml:"source,omitempty" json:"source,omitempty"`
+	OS      *osinfo.OSInfo `yaml:"os,omitempty" json:"os,omitempty"`
+	Release *Release       `yaml:"release,omitempty" json:"release,omitempty"`
+	Output  *Output        `yaml:"output,omitempty" json:"output,omitempty"`
 }
 
 // Load attempts to loads a plan YAML from given filename.
@@ -53,18 +54,37 @@ func (s *Plan) YAML() (string, error) {
 	return buf.String(), nil
 }
 
+// WriteJSON writes plan in JSON format to given io.Writer.
+func (s *Plan) WriteJSON(w io.Writer) error {
+	enc := json.NewEncoder(w)
+	enc.SetIndent("", "  ")
+
+	return enc.Encode(s)
+}
+
+// JSON returns plan in JSON format.
+func (s *Plan) JSON() (string, error) {
+	var buf bytes.Buffer
+	err := s.WriteJSON(&buf)
+	if err != nil {
+		return "", err
+	}
+
+	return buf.String(), nil
+}
+
 type Build struct {
-	Name string `yaml:"name,omitempty"`
+	Name string `yaml:"name,omitempty" json:"name,omitempty"`
 }
 
 type Release struct {
-	Name       string `yaml:"name"`
-	Title      string `yaml:"title,omitempty"`
-	Draft      bool   `yaml:"draft,omitempty"`
-	Prerelease bool   `yaml:"prerelease,omitempty"`
+	Name       string `yaml:"name" json:"name"`
+	Title      string `yaml:"title,omitempty" json:"title,omitempty"`
+	Draft      bool   `yaml:"draft,omitempty" json:"draft,omitempty"`
+	Prerelease bool   `yaml:"prerelease,omitempty" json:"prerelease,omitempty"`
 }
 
 type Output struct {
-	Directory string `yaml:"directory,omitempty"`
-	DiskImage string `yaml:"disk_image,omitempty"`
+	Directory string `yaml:"directory,omitempty" json:"directory,omitempty"`
+	DiskImage string `yaml:"disk_image,omitempty" json:"disk_image,omitempty"`
 }
diff --git a/pkg/repository/repository.go b/pkg/repository/repository.go
index f29c2a1..501fa28 100644
--- a/pkg/repository/repository.go
+++ b/pkg/repository/repository.go
@@ -22,8 +22,8 @@ const GitHub Type = "github"
 // Repository represents basic information about a repository with helper
 // methods to get various pieces of information from it.
 type Repository struct {
-	Type   Type   `yaml:"type,omitempty"`
-	Source string `yaml:"source,omitempty"`
+	Type   Type   `yaml:"type,omitempty" json:"type,omitempty"`
+	Source string `yaml:"source,omitempty" json:"source,omitempty"`
 }
 
 func NewGitHub(ownerAndName string) (*Repository, error) {
diff --git a/pkg/source/source.go b/pkg/source/source.go
index 749f8fa..b315168 100644
--- a/pkg/source/source.go
+++ b/pkg/source/source.go
@@ -6,12 +6,12 @@ import (
 )
 
 type Source struct {
-	Ref        string                 `yaml:"ref,omitempty"`
-	Repository *repository.Repository `yaml:"repository,omitempty"`
-	Commit     *commit.Commit         `yaml:"commit,omitempty"`
-	Tarball    *Tarball               `yaml:"tarball,omitempty"`
+	Ref        string                 `yaml:"ref,omitempty" json:"ref,omitempty"`
+	Repository *repository.Repository `yaml:"repository,omitempty" json:"repository,omitempty"`
+	Commit     *commit.Commit         `yaml:"commit,omitempty" json:"commit,omitempty"`
+	Tarball    *Tarball               `yaml:"tarball,omitempty" json:"tarball,omitempty"`
 }
 
 type Tarball struct {
-	URL string `yaml:"url,omitempty"`
+	URL string `yaml:"url,omitempty" json:"url,omitempty"`
 }