--- a/hgext/hgmo/tests/test-json-changeset.t
+++ b/hgext/hgmo/tests/test-json-changeset.t
@@ -25,16 +25,17 @@
 Last changeset
 
   $ http http://localhost:$HGPORT/json-rev/tip --header content-type --body-file body
   200
   content-type: application/json
 
   $ python -m json.tool < body
   {
+      "backedoutby": "",
       "bookmarks": [],
       "branch": "default",
       "date": [
           0.0,
           0
       ],
       "desc": "NO BUG",
       "node": "c761ad6d27c96f72f7e4637789e967c3f9730255",

--- a/hgserver/tests/test-push-basic.t
+++ b/hgserver/tests/test-push-basic.t
@@ -69,16 +69,17 @@ It got replicated to mirrors
 
   $ http --no-headers ${HGWEB_0_URL}mozilla-central/json-rev/77538e1ce4be
   200
   
   {
   "node": "77538e1ce4bec5f7aac58a7ceca2da0e38e90a72",
   "date": [0.0, 0],
   "desc": "initial",
+  "backedoutby": "",
   "branch": "default",
   "bookmarks": [],
   "tags": ["tip"],
   "user": "Test User \u003csomeone@example.com\u003e",
   "parents": [],
   "phase": "public",
   "pushid": 1,
   "pushdate": [*, 0], (glob)
@@ -87,16 +88,17 @@ It got replicated to mirrors
 
   $ http --no-headers ${HGWEB_1_URL}mozilla-central/json-rev/77538e1ce4be
   200
   
   {
   "node": "77538e1ce4bec5f7aac58a7ceca2da0e38e90a72",
   "date": [0.0, 0],
   "desc": "initial",
+  "backedoutby": "",
   "branch": "default",
   "bookmarks": [],
   "tags": ["tip"],
   "user": "Test User \u003csomeone@example.com\u003e",
   "parents": [],
   "phase": "public",
   "pushid": 1,
   "pushdate": [*, 0], (glob)

--- a/hgtemplates/json/map
+++ b/hgtemplates/json/map
@@ -41,16 +41,17 @@ changelistentry = '\{
   "tags": [{join(tags%changelistentryname, ", ")}],
   "user": {author|json}
   }'
 changelistentryname = '{name|json}'
 changeset = '\{
   "node": {node|json},
   "date": {date|json},
   "desc": {desc|json},
+  "backedoutby": {if(backedoutbynode, backedoutbynode|json, ""|json)},
   "branch": {if(branch, branch%changesetbranch, "default"|json)},
   "bookmarks": [{join(changesetbookmark, ", ")}],
   "tags": [{join(changesettag, ", ")}],
   "user": {author|json},
   "parents": [{join(parent%changesetparent, ", ")}],
   "phase": {phase|json},
   "pushid": {pushid|json},
   "pushdate": {pushdate|json},