diff --git a/component/cmp_asset.go b/component/cmp_asset.go
index c31a8d7..e1eee99 100644
--- a/component/cmp_asset.go
+++ b/component/cmp_asset.go
@@ -6,7 +6,7 @@ import (
 )
 
 type Asset struct {
-	ID      string `json:"-"`
+	ID      string `json:"id"`
 	Hash    string `json:"hash,omAssetpty"`
 	Content string `json:"content"`
 }
diff --git a/component/cmp_category.go b/component/cmp_category.go
index 05485ac..fff88ce 100644
--- a/component/cmp_category.go
+++ b/component/cmp_category.go
@@ -7,7 +7,7 @@ import (
 )
 
 type Category struct {
-	ID            string  `json:"-"`
+	ID            string  `json:"id"`
 	Name          string  `json:"name"`
 	Hash          string  `json:"hash"`
 	Locale        string  `json:"-"`
@@ -38,6 +38,7 @@ func (c *Category) Tree(html bool) interface{} {
 		subs = append(subs, c.subcategories[i].Tree(html))
 	}
 	return map[string]interface{}{
+		"id":            c.ID,
 		"name":          c.Name,
 		"subcategories": subs,
 	}
diff --git a/component/cmp_difficulty.go b/component/cmp_difficulty.go
index 86267ef..d359fde 100644
--- a/component/cmp_difficulty.go
+++ b/component/cmp_difficulty.go
@@ -8,7 +8,7 @@ import (
 
 type Difficulty struct {
 	parent    *Subcategory
-	ID        string `json:"-"`
+	ID        string `json:"id"`
 	Name      string `json:"name"`
 	Hash      string `json:"hash"`
 	items     []*Item
@@ -37,6 +37,7 @@ func (d *Difficulty) Tree(html bool) interface{} {
 		}
 	}
 	return map[string]interface{}{
+		"id":     d.ID,
 		"name":   d.Name,
 		"items":  items,
 		"checks": d.checklist.Checks,
diff --git a/component/cmp_form.go b/component/cmp_form.go
index c4b020f..74dbbd3 100644
--- a/component/cmp_form.go
+++ b/component/cmp_form.go
@@ -8,7 +8,7 @@ import (
 )
 
 type Form struct {
-	ID      string       `json:"-"`
+	ID      string       `json:"id"`
 	Name    string       `json:"name"`
 	Hash    string       `json:"hash"`
 	Locale  string       `json:"-"`
diff --git a/component/cmp_item.go b/component/cmp_item.go
index f13e477..be92d9e 100644
--- a/component/cmp_item.go
+++ b/component/cmp_item.go
@@ -12,7 +12,7 @@ const paragraphSep = "\n\n"
 
 type Item struct {
 	parent   *Difficulty
-	ID       string `json:"-"`
+	ID       string `json:"id"`
 	Hash     string `json:"hash,omitempty"`
 	Title    string `json:"title"`
 	Body     string `json:"body"`
diff --git a/component/cmp_subcategory.go b/component/cmp_subcategory.go
index 12ea603..387cd86 100644
--- a/component/cmp_subcategory.go
+++ b/component/cmp_subcategory.go
@@ -8,7 +8,7 @@ import (
 
 type Subcategory struct {
 	parent       *Category
-	ID           string  `json:"-"`
+	ID           string  `json:"id"`
 	Name         string  `json:"name"`
 	Hash         string  `json:"hash"`
 	Order        float64 `json:"-"`
@@ -34,6 +34,7 @@ func (s *Subcategory) Tree(html bool) interface{} {
 		difficulties[i] = v.Tree(html)
 	}
 	return map[string]interface{}{
+		"id":           s.ID,
 		"name":         s.Name,
 		"difficulties": difficulties,
 	}