diff --git a/mercurial/hgweb/webcommands.py b/mercurial/hgweb/webcommands.py
--- a/mercurial/hgweb/webcommands.py
+++ b/mercurial/hgweb/webcommands.py
@@ -707,8 +707,8 @@ def summary(web, req, tmpl):
                 parity=next(parity),
                 **webutil.commonentry(web.repo, ctx)))
 
-        l.reverse()
-        yield l
+        for entry in reversed(l):
+            yield entry
 
     tip = web.repo['tip']
     count = len(web.repo)
diff --git a/mercurial/templates/json/map b/mercurial/templates/json/map
--- a/mercurial/templates/json/map
+++ b/mercurial/templates/json/map
@@ -96,7 +96,21 @@ branchentry = '\{
   "date": {date|json},
   "status": {status|json}
   }'
-summary = '"not yet implemented"'
+shortlogentry = '{changelistentry}'
+summary = '\{
+  "node": {node|json},
+  "lastchange": {lastchange|json},
+  "bookmarks": [{join(bookmarks%bookmarkentry, ", ")}],
+  "branches": [{join(branches%branchentry, ", ")}],
+  "shortlog": [{join(shortlog%shortlogentry, ", ")}],
+  "tags": [{join(tags%tagentry, ", ")}],
+  "archives": [{join(archives%archiveentry, ", ")}]
+  }'
+archiveentry = '\{
+  "node": {node|json},
+  "extension": {extension|json},
+  "type": {type|json}
+  }'
 filediff = '\{
   "path": {file|json},
   "node": {node|json},
diff --git a/tests/test-hgweb-json.t b/tests/test-hgweb-json.t
--- a/tests/test-hgweb-json.t
+++ b/tests/test-hgweb-json.t
@@ -799,7 +799,241 @@ summary/ shows a summary of repository s
   $ request json-summary
   200 Script output follows
   
-  "not yet implemented"
+  {
+    "archives": [],
+    "bookmarks": [
+      {
+        "bookmark": "bookmark2",
+        "date": [
+          0.0,
+          0
+        ],
+        "node": "ceed296fe500c3fac9541e31dad860cb49c89e45"
+      },
+      {
+        "bookmark": "bookmark1",
+        "date": [
+          0.0,
+          0
+        ],
+        "node": "8d7c456572acf3557e8ed8a07286b10c408bcec5"
+      }
+    ],
+    "branches": [
+      {
+        "branch": "default",
+        "date": [
+          0.0,
+          0
+        ],
+        "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
+        "status": "open"
+      },
+      {
+        "branch": "test-branch",
+        "date": [
+          0.0,
+          0
+        ],
+        "node": "ed66c30e87eb65337c05a4229efaa5f1d5285a90",
+        "status": "inactive"
+      }
+    ],
+    "lastchange": [
+      0.0,
+      0
+    ],
+    "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
+    "shortlog": [
+      {
+        "bookmarks": [],
+        "branch": "default",
+        "date": [
+          0.0,
+          0
+        ],
+        "desc": "merge test-branch into default",
+        "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
+        "parents": [
+          "ceed296fe500c3fac9541e31dad860cb49c89e45",
+          "ed66c30e87eb65337c05a4229efaa5f1d5285a90"
+        ],
+        "phase": "draft",
+        "tags": [
+          "tip"
+        ],
+        "user": "test"
+      },
+      {
+        "bookmarks": [],
+        "branch": "test-branch",
+        "date": [
+          0.0,
+          0
+        ],
+        "desc": "another commit in test-branch",
+        "node": "ed66c30e87eb65337c05a4229efaa5f1d5285a90",
+        "parents": [
+          "6ab967a8ab3489227a83f80e920faa039a71819f"
+        ],
+        "phase": "draft",
+        "tags": [],
+        "user": "test"
+      },
+      {
+        "bookmarks": [],
+        "branch": "test-branch",
+        "date": [
+          0.0,
+          0
+        ],
+        "desc": "create test branch",
+        "node": "6ab967a8ab3489227a83f80e920faa039a71819f",
+        "parents": [
+          "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e"
+        ],
+        "phase": "draft",
+        "tags": [],
+        "user": "test"
+      },
+      {
+        "bookmarks": [
+          "bookmark2"
+        ],
+        "branch": "default",
+        "date": [
+          0.0,
+          0
+        ],
+        "desc": "create tag2",
+        "node": "ceed296fe500c3fac9541e31dad860cb49c89e45",
+        "parents": [
+          "f2890a05fea49bfaf9fb27ed5490894eba32da78"
+        ],
+        "phase": "draft",
+        "tags": [],
+        "user": "test"
+      },
+      {
+        "bookmarks": [],
+        "branch": "default",
+        "date": [
+          0.0,
+          0
+        ],
+        "desc": "another commit to da/foo",
+        "node": "f2890a05fea49bfaf9fb27ed5490894eba32da78",
+        "parents": [
+          "93a8ce14f89156426b7fa981af8042da53f03aa0"
+        ],
+        "phase": "draft",
+        "tags": [
+          "tag2"
+        ],
+        "user": "test"
+      },
+      {
+        "bookmarks": [],
+        "branch": "default",
+        "date": [
+          0.0,
+          0
+        ],
+        "desc": "create tag",
+        "node": "93a8ce14f89156426b7fa981af8042da53f03aa0",
+        "parents": [
+          "78896eb0e102174ce9278438a95e12543e4367a7"
+        ],
+        "phase": "public",
+        "tags": [],
+        "user": "test"
+      },
+      {
+        "bookmarks": [],
+        "branch": "default",
+        "date": [
+          0.0,
+          0
+        ],
+        "desc": "move foo",
+        "node": "78896eb0e102174ce9278438a95e12543e4367a7",
+        "parents": [
+          "8d7c456572acf3557e8ed8a07286b10c408bcec5"
+        ],
+        "phase": "public",
+        "tags": [
+          "tag1"
+        ],
+        "user": "test"
+      },
+      {
+        "bookmarks": [
+          "bookmark1"
+        ],
+        "branch": "default",
+        "date": [
+          0.0,
+          0
+        ],
+        "desc": "modify da/foo",
+        "node": "8d7c456572acf3557e8ed8a07286b10c408bcec5",
+        "parents": [
+          "f8bbb9024b10f93cdbb8d940337398291d40dea8"
+        ],
+        "phase": "public",
+        "tags": [],
+        "user": "test"
+      },
+      {
+        "bookmarks": [],
+        "branch": "default",
+        "date": [
+          0.0,
+          0
+        ],
+        "desc": "modify foo",
+        "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8",
+        "parents": [
+          "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e"
+        ],
+        "phase": "public",
+        "tags": [],
+        "user": "test"
+      },
+      {
+        "bookmarks": [],
+        "branch": "default",
+        "date": [
+          0.0,
+          0
+        ],
+        "desc": "initial",
+        "node": "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e",
+        "parents": [],
+        "phase": "public",
+        "tags": [],
+        "user": "test"
+      }
+    ],
+    "tags": [
+      {
+        "date": [
+          0.0,
+          0
+        ],
+        "node": "f2890a05fea49bfaf9fb27ed5490894eba32da78",
+        "tag": "tag2"
+      },
+      {
+        "date": [
+          0.0,
+          0
+        ],
+        "node": "78896eb0e102174ce9278438a95e12543e4367a7",
+        "tag": "tag1"
+      }
+    ]
+  }
 
 filediff/{revision}/{path} shows changes to a file in a revision