diff --git a/api/mirror.go b/api/mirror.go
index aa4af0a2..bf8d3bad 100644
--- a/api/mirror.go
+++ b/api/mirror.go
@@ -66,17 +66,26 @@ func uniqueStrings(input []string) []string {
 // @Description Each mirror is returned as in “show” API.
 // @Tags Mirrors
 // @Produce json
-// @Success 200 {array} deb.RemoteRepo
+// @Success 200 {array} remoteRepoResponse
 // @Router /api/mirrors [get]
 func apiMirrorsList(c *gin.Context) {
 	collectionFactory := context.NewCollectionFactory()
 	collection := collectionFactory.RemoteRepoCollection()
 
-	result := []*deb.RemoteRepo{}
-	_ = collection.ForEach(func(repo *deb.RemoteRepo) error {
-		result = append(result, repo)
+	result := []remoteRepoResponse{}
+	err := collection.ForEach(func(repo *deb.RemoteRepo) error {
+		err := collection.LoadComplete(repo)
+		if err != nil {
+			return err
+		}
+
+		result = append(result, newRemoteRepoResponse(repo))
 		return nil
 	})
+	if err != nil {
+		AbortWithJSONError(c, 500, fmt.Errorf("unable to show: %s", err))
+		return
+	}
 
 	c.JSON(200, result)
 }
@@ -264,6 +273,7 @@ func apiMirrorsShow(c *gin.Context) {
 	err = collection.LoadComplete(repo)
 	if err != nil {
 		AbortWithJSONError(c, 500, fmt.Errorf("unable to show: %s", err))
+		return
 	}
 
 	c.JSON(200, repo)
diff --git a/api/mirror_test.go b/api/mirror_test.go
index cb64d485..65433e7f 100644
--- a/api/mirror_test.go
+++ b/api/mirror_test.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 
+	"github.com/aptly-dev/aptly/deb"
 	"github.com/gin-gonic/gin"
 	. "gopkg.in/check.v1"
 )
@@ -17,7 +18,10 @@ var _ = Suite(&MirrorSuite{})
 func (s *MirrorSuite) TestGetMirrors(c *C) {
 	response, _ := s.HTTPRequest("GET", "/api/mirrors", nil)
 	c.Check(response.Code, Equals, 200)
-	c.Check(response.Body.String(), Equals, "[]")
+
+	var mirrors []map[string]interface{}
+	err := json.Unmarshal(response.Body.Bytes(), &mirrors)
+	c.Assert(err, IsNil)
 }
 
 func (s *MirrorSuite) TestDeleteMirrorNonExisting(c *C) {
@@ -53,3 +57,49 @@ func (s *MirrorSuite) TestCreateMirror(c *C) {
 	c.Check(response.Code, Equals, 400)
 	c.Check(response.Body.String(), Equals, "")
 }
+
+func (s *MirrorSuite) TestGetMirrorsIncludesNumPackages(c *C) {
+	collection := s.context.NewCollectionFactory().RemoteRepoCollection()
+
+	repo, err := deb.NewRemoteRepo("count-mirror", "http://example.com/debian", "stable", []string{"main"}, []string{}, false, false, false, false)
+	c.Assert(err, IsNil)
+
+	err = collection.Add(repo)
+	c.Assert(err, IsNil)
+	putRawDBValue(c, &s.APISuite, repo.RefKey(), makePackageRefList(c).Encode())
+
+	response, err := s.HTTPRequest("GET", "/api/mirrors", nil)
+	c.Assert(err, IsNil)
+	c.Assert(response.Code, Equals, 200)
+
+	var mirrors []map[string]interface{}
+	err = json.Unmarshal(response.Body.Bytes(), &mirrors)
+	c.Assert(err, IsNil)
+
+	found := false
+	for _, mirror := range mirrors {
+		if mirror["Name"] == "count-mirror" {
+			found = true
+			value, ok := mirror["NumPackages"]
+			c.Assert(ok, Equals, true)
+			c.Assert(value, Equals, float64(2))
+			break
+		}
+	}
+
+	c.Assert(found, Equals, true)
+}
+
+func (s *MirrorSuite) TestGetMirrorsReturns500OnCorruptRefList(c *C) {
+	collection := s.context.NewCollectionFactory().RemoteRepoCollection()
+
+	repo, err := deb.NewRemoteRepo("broken-mirror", "http://example.com/debian", "stable", []string{"main"}, []string{}, false, false, false, false)
+	c.Assert(err, IsNil)
+	c.Assert(collection.Add(repo), IsNil)
+	putRawDBValue(c, &s.APISuite, repo.RefKey(), []byte("not-msgpack"))
+
+	response, err := s.HTTPRequest("GET", "/api/mirrors", nil)
+	c.Assert(err, IsNil)
+	c.Assert(response.Code, Equals, 500)
+	c.Assert(response.Body.String(), Matches, ".*unable to show:.*")
+}
diff --git a/api/package_count_response.go b/api/package_count_response.go
new file mode 100644
index 00000000..4edb215d
--- /dev/null
+++ b/api/package_count_response.go
@@ -0,0 +1,30 @@
+package api
+
+import "github.com/aptly-dev/aptly/deb"
+
+type remoteRepoResponse struct {
+	*deb.RemoteRepo
+	NumPackages int `json:"NumPackages"`
+}
+
+type localRepoResponse struct {
+	*deb.LocalRepo
+	NumPackages int `json:"NumPackages"`
+}
+
+type snapshotResponse struct {
+	*deb.Snapshot
+	NumPackages int `json:"NumPackages"`
+}
+
+func newRemoteRepoResponse(repo *deb.RemoteRepo) remoteRepoResponse {
+	return remoteRepoResponse{RemoteRepo: repo, NumPackages: repo.NumPackages()}
+}
+
+func newLocalRepoResponse(repo *deb.LocalRepo) localRepoResponse {
+	return localRepoResponse{LocalRepo: repo, NumPackages: repo.NumPackages()}
+}
+
+func newSnapshotResponse(snapshot *deb.Snapshot) snapshotResponse {
+	return snapshotResponse{Snapshot: snapshot, NumPackages: snapshot.NumPackages()}
+}
diff --git a/api/package_count_test_helpers_test.go b/api/package_count_test_helpers_test.go
new file mode 100644
index 00000000..fc86ef3c
--- /dev/null
+++ b/api/package_count_test_helpers_test.go
@@ -0,0 +1,19 @@
+package api
+
+import (
+	"github.com/aptly-dev/aptly/deb"
+	. "gopkg.in/check.v1"
+)
+
+func makePackageRefList(c *C) *deb.PackageRefList {
+	list := deb.NewPackageList()
+	c.Assert(list.Add(&deb.Package{Name: "libcount", Version: "1.0", Architecture: "amd64"}), IsNil)
+	c.Assert(list.Add(&deb.Package{Name: "appcount", Version: "2.0", Architecture: "all"}), IsNil)
+	return deb.NewPackageRefListFromPackageList(list)
+}
+
+func putRawDBValue(c *C, s *APISuite, key []byte, value []byte) {
+	db, err := s.context.Database()
+	c.Assert(err, IsNil)
+	c.Assert(db.Put(key, value), IsNil)
+}
\ No newline at end of file
diff --git a/api/repos.go b/api/repos.go
index 6f418bf8..77dd5172 100644
--- a/api/repos.go
+++ b/api/repos.go
@@ -69,17 +69,26 @@ func reposServeInAPIMode(c *gin.Context) {
 // @Description Each repo is returned as in “show” API.
 // @Tags Repos
 // @Produce  json
-// @Success 200 {array} deb.LocalRepo
+// @Success 200 {array} localRepoResponse
 // @Router /api/repos [get]
 func apiReposList(c *gin.Context) {
-	result := []*deb.LocalRepo{}
+	result := []localRepoResponse{}
 
 	collectionFactory := context.NewCollectionFactory()
 	collection := collectionFactory.LocalRepoCollection()
-	_ = collection.ForEach(func(r *deb.LocalRepo) error {
-		result = append(result, r)
+	err := collection.ForEach(func(r *deb.LocalRepo) error {
+		err := collection.LoadComplete(r)
+		if err != nil {
+			return err
+		}
+
+		result = append(result, newLocalRepoResponse(r))
 		return nil
 	})
+	if err != nil {
+		AbortWithJSONError(c, 500, err)
+		return
+	}
 
 	c.JSON(200, result)
 }
diff --git a/api/repos_test.go b/api/repos_test.go
new file mode 100644
index 00000000..55117316
--- /dev/null
+++ b/api/repos_test.go
@@ -0,0 +1,63 @@
+package api
+
+import (
+	"bytes"
+	"encoding/json"
+
+	"github.com/aptly-dev/aptly/deb"
+	"github.com/gin-gonic/gin"
+	. "gopkg.in/check.v1"
+)
+
+type ReposSuite struct {
+	APISuite
+}
+
+var _ = Suite(&ReposSuite{})
+
+func (s *ReposSuite) TestGetReposIncludesNumPackages(c *C) {
+	collection := s.context.NewCollectionFactory().LocalRepoCollection()
+	repo := deb.NewLocalRepo("count-repo-list", "")
+	repo.UpdateRefList(makePackageRefList(c))
+	c.Assert(collection.Add(repo), IsNil)
+
+	response, err := s.HTTPRequest("GET", "/api/repos", nil)
+	c.Assert(err, IsNil)
+	c.Assert(response.Code, Equals, 200)
+
+	var repos []map[string]interface{}
+	err = json.Unmarshal(response.Body.Bytes(), &repos)
+	c.Assert(err, IsNil)
+
+	found := false
+	for _, repo := range repos {
+		if repo["Name"] == "count-repo-list" {
+			found = true
+			value, ok := repo["NumPackages"]
+			c.Assert(ok, Equals, true)
+			c.Assert(value, Equals, float64(2))
+			break
+		}
+	}
+
+	c.Assert(found, Equals, true)
+}
+
+func (s *ReposSuite) TestGetReposReturns500OnCorruptRefList(c *C) {
+	body, err := json.Marshal(gin.H{"Name": "broken-repo-list"})
+	c.Assert(err, IsNil)
+
+	response, err := s.HTTPRequest("POST", "/api/repos", bytes.NewReader(body))
+	c.Assert(err, IsNil)
+	c.Assert(response.Code, Equals, 201)
+
+	collection := s.context.NewCollectionFactory().LocalRepoCollection()
+	repo, err := collection.ByName("broken-repo-list")
+	c.Assert(err, IsNil)
+	putRawDBValue(c, &s.APISuite, repo.RefKey(), []byte("not-msgpack"))
+
+	response, err = s.HTTPRequest("GET", "/api/repos", nil)
+	c.Assert(err, IsNil)
+	c.Assert(response.Code, Equals, 500)
+	c.Assert(response.Body.String(), Matches, ".*msgpack.*|.*decode.*")
+}
diff --git a/api/snapshot.go b/api/snapshot.go
index 24f276c5..2c50566f 100644
--- a/api/snapshot.go
+++ b/api/snapshot.go
@@ -20,7 +20,7 @@ import (
 // @Description Each snapshot is returned as in “show” API.
 // @Tags Snapshots
 // @Produce  json
-// @Success 200 {array} deb.Snapshot
+// @Success 200 {array} snapshotResponse
 // @Router /api/snapshots [get]
 func apiSnapshotsList(c *gin.Context) {
 	SortMethodString := c.Request.URL.Query().Get("sort")
@@ -32,11 +32,20 @@ func apiSnapshotsList(c *gin.Context) {
 		SortMethodString = "name"
 	}
 
-	result := []*deb.Snapshot{}
-	_ = collection.ForEachSorted(SortMethodString, func(snapshot *deb.Snapshot) error {
-		result = append(result, snapshot)
+	result := []snapshotResponse{}
+	err := collection.ForEachSorted(SortMethodString, func(snapshot *deb.Snapshot) error {
+		err := collection.LoadComplete(snapshot)
+		if err != nil {
+			return err
+		}
+
+		result = append(result, newSnapshotResponse(snapshot))
 		return nil
 	})
+	if err != nil {
+		AbortWithJSONError(c, 500, err)
+		return
+	}
 
 	c.JSON(200, result)
 }
diff --git a/api/snapshot_test.go b/api/snapshot_test.go
new file mode 100644
index 00000000..36c50809
--- /dev/null
+++ b/api/snapshot_test.go
@@ -0,0 +1,53 @@
+package api
+
+import (
+	"encoding/json"
+
+	"github.com/aptly-dev/aptly/deb"
+	. "gopkg.in/check.v1"
+)
+
+type SnapshotsSuite struct {
+	APISuite
+}
+
+var _ = Suite(&SnapshotsSuite{})
+
+func (s *SnapshotsSuite) TestGetSnapshotsIncludesNumPackages(c *C) {
+	collection := s.context.NewCollectionFactory().SnapshotCollection()
+	snapshot := deb.NewSnapshotFromRefList("count-snapshot-list", nil, makePackageRefList(c), "")
+	c.Assert(collection.Add(snapshot), IsNil)
+
+	response, err := s.HTTPRequest("GET", "/api/snapshots", nil)
+	c.Assert(err, IsNil)
+	c.Assert(response.Code, Equals, 200)
+
+	var snapshots []map[string]interface{}
+	err = json.Unmarshal(response.Body.Bytes(), &snapshots)
+	c.Assert(err, IsNil)
+
+	found := false
+	for _, snapshot := range snapshots {
+		if snapshot["Name"] == "count-snapshot-list" {
+			found = true
+			value, ok := snapshot["NumPackages"]
+			c.Assert(ok, Equals, true)
+			c.Assert(value, Equals, float64(2))
+			break
+		}
+	}
+
+	c.Assert(found, Equals, true)
+}
+
+func (s *SnapshotsSuite) TestGetSnapshotsReturns500OnCorruptRefList(c *C) {
+	collection := s.context.NewCollectionFactory().SnapshotCollection()
+	snapshot := deb.NewSnapshotFromRefList("broken-snapshot-list", nil, makePackageRefList(c), "")
+	c.Assert(collection.Add(snapshot), IsNil)
+	putRawDBValue(c, &s.APISuite, snapshot.RefKey(), []byte("not-msgpack"))
+
+	response, err := s.HTTPRequest("GET", "/api/snapshots", nil)
+	c.Assert(err, IsNil)
+	c.Assert(response.Code, Equals, 500)
+	c.Assert(response.Body.String(), Matches, ".*msgpack.*|.*decode.*")
+}