diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0f0b2420bb..1f6004543f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -97,7 +97,9 @@ target_link_libraries(textformat
   port
   reflection)
 add_library(json
+  upb/json_decode.c
   upb/json_encode.c
+  upb/json_decode.h
   upb/json_encode.h)
 target_link_libraries(json
   port
diff --git a/generated_for_cmake/upb/json/parser.c b/generated_for_cmake/upb/json/parser.c
index 0efc7301d1..e3f4d0a465 100644
--- a/generated_for_cmake/upb/json/parser.c
+++ b/generated_for_cmake/upb/json/parser.c
@@ -3311,15 +3311,13 @@ static upb_json_parsermethod *parsermethod_new(upb_json_codecache *c,
       upb_msg_field_next(&i)) {
     const upb_fielddef *f = upb_msg_iter_field(&i);
     upb_value v = upb_value_constptr(f);
-    char *buf;
+    const char *name;
 
     /* Add an entry for the JSON name. */
-    size_t len = upb_fielddef_getjsonname(f, NULL, 0);
-    buf = upb_malloc(alloc, len);
-    upb_fielddef_getjsonname(f, buf, len);
-    upb_strtable_insert3(&m->name_table, buf, strlen(buf), v, alloc);
+    name = upb_fielddef_jsonname(f);
+    upb_strtable_insert3(&m->name_table, name, strlen(name), v, alloc);
 
-    if (strcmp(buf, upb_fielddef_name(f)) != 0) {
+    if (strcmp(name, upb_fielddef_name(f)) != 0) {
       /* Since the JSON name is different from the regular field name, add an
        * entry for the raw name (compliant proto3 JSON parsers must accept
        * both). */
diff --git a/upb/json/parser.rl b/upb/json/parser.rl
index eefdadf577..0b303142e7 100644
--- a/upb/json/parser.rl
+++ b/upb/json/parser.rl
@@ -2874,15 +2874,13 @@ static upb_json_parsermethod *parsermethod_new(upb_json_codecache *c,
       upb_msg_field_next(&i)) {
     const upb_fielddef *f = upb_msg_iter_field(&i);
     upb_value v = upb_value_constptr(f);
-    char *buf;
+    const char *name;
 
     /* Add an entry for the JSON name. */
-    size_t len = upb_fielddef_getjsonname(f, NULL, 0);
-    buf = upb_malloc(alloc, len);
-    upb_fielddef_getjsonname(f, buf, len);
-    upb_strtable_insert3(&m->name_table, buf, strlen(buf), v, alloc);
+    name = upb_fielddef_jsonname(f);
+    upb_strtable_insert3(&m->name_table, name, strlen(name), v, alloc);
 
-    if (strcmp(buf, upb_fielddef_name(f)) != 0) {
+    if (strcmp(name, upb_fielddef_name(f)) != 0) {
       /* Since the JSON name is different from the regular field name, add an
        * entry for the raw name (compliant proto3 JSON parsers must accept
        * both). */
diff --git a/upb/json/printer.c b/upb/json/printer.c
index a3cb9bdb01..99b62b2ae2 100644
--- a/upb/json/printer.c
+++ b/upb/json/printer.c
@@ -65,12 +65,8 @@ strpc *newstrpc(upb_handlers *h, const upb_fielddef *f,
     ret->ptr = upb_gstrdup(upb_fielddef_name(f));
     ret->len = strlen(ret->ptr);
   } else {
-    size_t len;
-    ret->len = upb_fielddef_getjsonname(f, NULL, 0);
-    ret->ptr = upb_gmalloc(ret->len);
-    len = upb_fielddef_getjsonname(f, ret->ptr, ret->len);
-    UPB_ASSERT(len == ret->len);
-    ret->len--;  /* NULL */
+    ret->ptr = upb_gstrdup(upb_fielddef_jsonname(f));
+    ret->len = strlen(ret->ptr);
   }
 
   upb_handlers_addcleanup(h, ret, freestrpc);