diff --git a/wagtail/blocks/field_block.py b/wagtail/blocks/field_block.py
index f415fe5297..1e5885e4ea 100644
--- a/wagtail/blocks/field_block.py
+++ b/wagtail/blocks/field_block.py
@@ -112,6 +112,7 @@ class FieldBlockAdapter(Adapter):
             "label": block.label,
             "required": block.required,
             "icon": block.meta.icon,
+            "blockDefId": block.definition_prefix,
             "classname": " ".join(classname),
             "showAddCommentButton": getattr(
                 block.field.widget, "show_add_comment_button", True
diff --git a/wagtail/blocks/list_block.py b/wagtail/blocks/list_block.py
index ebc99faf69..618e1bfa46 100644
--- a/wagtail/blocks/list_block.py
+++ b/wagtail/blocks/list_block.py
@@ -450,6 +450,7 @@ class ListBlockAdapter(Adapter):
         meta = {
             "label": block.label,
             "icon": block.meta.icon,
+            "blockDefId": block.definition_prefix,
             "classname": block.meta.form_classname,
             "collapsed": block.meta.collapsed,
             "strings": {
diff --git a/wagtail/blocks/static_block.py b/wagtail/blocks/static_block.py
index 88ca712481..a0fe74544b 100644
--- a/wagtail/blocks/static_block.py
+++ b/wagtail/blocks/static_block.py
@@ -58,6 +58,7 @@ class StaticBlockAdapter(Adapter):
                 text_or_html: admin_text,
                 "icon": block.meta.icon,
                 "label": block.label,
+                "blockDefId": block.definition_prefix,
             },
         ]
 
diff --git a/wagtail/blocks/stream_block.py b/wagtail/blocks/stream_block.py
index 48145bef90..592d1e1e17 100644
--- a/wagtail/blocks/stream_block.py
+++ b/wagtail/blocks/stream_block.py
@@ -828,6 +828,7 @@ class StreamBlockAdapter(Adapter):
             "label": block.label,
             "required": block.required,
             "icon": block.meta.icon,
+            "blockDefId": block.definition_prefix,
             "classname": block.meta.form_classname,
             "maxNum": block.meta.max_num,
             "minNum": block.meta.min_num,
diff --git a/wagtail/blocks/struct_block.py b/wagtail/blocks/struct_block.py
index 2ff7962f02..b12018c094 100644
--- a/wagtail/blocks/struct_block.py
+++ b/wagtail/blocks/struct_block.py
@@ -403,6 +403,7 @@ class StructBlockAdapter(Adapter):
             "label": block.label,
             "required": block.required,
             "icon": block.meta.icon,
+            "blockDefId": block.definition_prefix,
             "classname": block.meta.form_classname,
         }
 
diff --git a/wagtail/contrib/table_block/tests.py b/wagtail/contrib/table_block/tests.py
index 98fb8ef074..d3f292d03a 100644
--- a/wagtail/contrib/table_block/tests.py
+++ b/wagtail/contrib/table_block/tests.py
@@ -571,6 +571,7 @@ class TestTableBlockForm(WagtailTestUtils, SimpleTestCase):
                 "label": "Test tableblock",
                 "required": True,
                 "icon": "table",
+                "blockDefId": block.definition_prefix,
                 "classname": "w-field w-field--char_field w-field--table_input",
                 "showAddCommentButton": True,
                 "strings": {"ADD_COMMENT": "Add Comment"},
diff --git a/wagtail/contrib/typed_table_block/blocks.py b/wagtail/contrib/typed_table_block/blocks.py
index ba108fdfdb..84f9088aab 100644
--- a/wagtail/contrib/typed_table_block/blocks.py
+++ b/wagtail/contrib/typed_table_block/blocks.py
@@ -334,6 +334,7 @@ class TypedTableBlockAdapter(Adapter):
             "label": block.label,
             "required": block.required,
             "icon": block.meta.icon,
+            "blockDefId": block.definition_prefix,
             "strings": {
                 "CAPTION": _("Caption"),
                 "CAPTION_HELP_TEXT": _(
diff --git a/wagtail/contrib/typed_table_block/tests.py b/wagtail/contrib/typed_table_block/tests.py
index 66437801fc..8b60a41388 100644
--- a/wagtail/contrib/typed_table_block/tests.py
+++ b/wagtail/contrib/typed_table_block/tests.py
@@ -9,6 +9,7 @@ from wagtail.blocks.struct_block import StructBlockValidationError
 from wagtail.contrib.typed_table_block.blocks import (
     TypedTable,
     TypedTableBlock,
+    TypedTableBlockAdapter,
     TypedTableBlockValidationError,
 )
 
@@ -223,6 +224,36 @@ class TestTableBlock(TestCase):
         # rendering should use the block renderings of the child blocks ('FR' not 'fr')
         self.assertIn("<td>FR</td>", html)
 
+    def test_adapt(self):
+        block = TypedTableBlock()
+
+        block.set_name("test_typedtableblock")
+        js_args = TypedTableBlockAdapter().js_args(block)
+
+        self.assertEqual(js_args[0], "test_typedtableblock")
+        self.assertEqual(
+            js_args[-1],
+            {
+                "label": "Test typedtableblock",
+                "required": False,
+                "icon": "table",
+                "blockDefId": block.definition_prefix,
+                "strings": {
+                    "CAPTION": "Caption",
+                    "CAPTION_HELP_TEXT": (
+                        "A heading that identifies the overall topic of the table, and is useful for screen reader users."
+                    ),
+                    "ADD_COLUMN": "Add column",
+                    "ADD_ROW": "Add row",
+                    "COLUMN_HEADING": "Column heading",
+                    "INSERT_COLUMN": "Insert column",
+                    "DELETE_COLUMN": "Delete column",
+                    "INSERT_ROW": "Insert row",
+                    "DELETE_ROW": "Delete row",
+                },
+            },
+        )
+
     def test_validation_error_as_json(self):
         error = TypedTableBlockValidationError(
             cell_errors={
diff --git a/wagtail/snippets/tests/test_snippets.py b/wagtail/snippets/tests/test_snippets.py
index 611d744053..52bdc066e3 100644
--- a/wagtail/snippets/tests/test_snippets.py
+++ b/wagtail/snippets/tests/test_snippets.py
@@ -5538,6 +5538,7 @@ class TestSnippetChooserBlock(TestCase):
                 "label": "Test snippetchooserblock",
                 "required": True,
                 "icon": "snippet",
+                "blockDefId": block.definition_prefix,
                 "helpText": "pick an advert, any advert",
                 "classname": "w-field w-field--model_choice_field w-field--admin_snippet_chooser",
                 "showAddCommentButton": True,
@@ -5846,6 +5847,7 @@ class TestSnippetChooserBlockWithCustomPrimaryKey(TestCase):
                 "label": "Test snippetchooserblock",
                 "required": True,
                 "icon": "snippet",
+                "blockDefId": block.definition_prefix,
                 "helpText": "pick an advert, any advert",
                 "classname": "w-field w-field--model_choice_field w-field--admin_snippet_chooser",
                 "showAddCommentButton": True,
diff --git a/wagtail/tests/test_blocks.py b/wagtail/tests/test_blocks.py
index c8032c9c9d..7561d99982 100644
--- a/wagtail/tests/test_blocks.py
+++ b/wagtail/tests/test_blocks.py
@@ -98,6 +98,7 @@ class TestFieldBlock(WagtailTestUtils, SimpleTestCase):
                 "helpText": "Some helpful text",
                 "required": True,
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": "w-field w-field--char_field w-field--text_input",
                 "showAddCommentButton": True,
                 "strings": {"ADD_COMMENT": "Add Comment"},
@@ -204,6 +205,7 @@ class TestFieldBlock(WagtailTestUtils, SimpleTestCase):
                 "label": "Test choiceblock",
                 "required": True,
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": "w-field w-field--choice_field w-field--select",
                 "showAddCommentButton": True,
                 "strings": {"ADD_COMMENT": "Add Comment"},
@@ -613,6 +615,7 @@ class TestRichTextBlock(TestCase):
                 "classname": "w-field w-field--char_field w-field--custom_rich_text_area",
                 "icon": "pilcrow",
                 "label": "Test richtextblock",
+                "blockDefId": block.definition_prefix,
                 "required": True,
                 "showAddCommentButton": True,
                 "strings": {"ADD_COMMENT": "Add Comment"},
@@ -635,6 +638,7 @@ class TestRichTextBlock(TestCase):
                 "label": "Test richtextblock",
                 "required": True,
                 "icon": "pilcrow",
+                "blockDefId": block.definition_prefix,
                 "classname": "w-field w-field--char_field w-field--draftail_rich_text_area",
                 "showAddCommentButton": False,  # Draftail manages its own comments
                 "strings": {"ADD_COMMENT": "Add Comment"},
@@ -657,6 +661,7 @@ class TestRichTextBlock(TestCase):
                 "label": "Test richtextblock",
                 "required": True,
                 "icon": "pilcrow",
+                "blockDefId": block.definition_prefix,
                 "classname": "w-field w-field--char_field w-field--draftail_rich_text_area",
                 "showAddCommentButton": False,  # Draftail manages its own comments
                 "strings": {"ADD_COMMENT": "Add Comment"},
@@ -772,6 +777,7 @@ class TestChoiceBlock(WagtailTestUtils, SimpleTestCase):
                 "label": "Test choiceblock",
                 "required": True,
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": "w-field w-field--choice_field w-field--select",
                 "showAddCommentButton": True,
                 "strings": {"ADD_COMMENT": "Add Comment"},
@@ -1173,6 +1179,7 @@ class TestMultipleChoiceBlock(WagtailTestUtils, SimpleTestCase):
                 "label": "Test choiceblock",
                 "required": True,
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": "w-field w-field--multiple_choice_field w-field--select_multiple",
                 "showAddCommentButton": True,
                 "strings": {"ADD_COMMENT": "Add Comment"},
@@ -1609,6 +1616,7 @@ class TestRawHTMLBlock(unittest.TestCase):
                 "label": "Test rawhtmlblock",
                 "required": True,
                 "icon": "code",
+                "blockDefId": block.definition_prefix,
                 "classname": "w-field w-field--char_field w-field--textarea",
                 "showAddCommentButton": True,
                 "strings": {"ADD_COMMENT": "Add Comment"},
@@ -1951,6 +1959,7 @@ class TestStructBlock(SimpleTestCase):
                 "label": "Test structblock",
                 "required": False,
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": "struct-block",
             },
         )
@@ -1980,6 +1989,7 @@ class TestStructBlock(SimpleTestCase):
                 "label": "Test structblock",
                 "required": False,
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": "struct-block",
                 "formTemplate": "<div>Hello</div>",
             },
@@ -2004,6 +2014,7 @@ class TestStructBlock(SimpleTestCase):
                 "label": "Test structblock",
                 "required": False,
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": "struct-block",
                 "formTemplate": "<div>Hello</div>",
             },
@@ -2037,6 +2048,7 @@ class TestStructBlock(SimpleTestCase):
                 "label": "Test structblock",
                 "required": False,
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": "struct-block",
                 "helpIcon": (
                     '<svg class="icon icon-help default" aria-hidden="true">'
@@ -2062,6 +2074,7 @@ class TestStructBlock(SimpleTestCase):
                 "label": "Test structblock",
                 "required": False,
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": "struct-block",
                 "helpIcon": (
                     '<svg class="icon icon-help default" aria-hidden="true">'
@@ -2690,6 +2703,7 @@ class TestListBlock(WagtailTestUtils, SimpleTestCase):
             {
                 "label": "Test listblock",
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": None,
                 "collapsed": False,
                 "strings": {
@@ -2720,6 +2734,7 @@ class TestListBlock(WagtailTestUtils, SimpleTestCase):
             {
                 "label": "Test listblock",
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": None,
                 "collapsed": False,
                 "minNum": 2,
@@ -2894,6 +2909,7 @@ class TestListBlock(WagtailTestUtils, SimpleTestCase):
             {
                 "label": "Test listblock",
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": "special-list-class",
                 "collapsed": False,
                 "strings": {
@@ -2927,6 +2943,7 @@ class TestListBlock(WagtailTestUtils, SimpleTestCase):
             {
                 "label": "Test listblock",
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": "custom-list-class",
                 "collapsed": False,
                 "strings": {
@@ -3564,6 +3581,7 @@ class TestStreamBlock(WagtailTestUtils, SimpleTestCase):
             {
                 "label": "Test streamblock",
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "classname": None,
                 "collapsed": False,
                 "maxNum": None,
@@ -4290,6 +4308,7 @@ class TestStreamBlock(WagtailTestUtils, SimpleTestCase):
             {
                 "label": "Test streamblock",
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "minNum": None,
                 "maxNum": None,
                 "blockCounts": {},
@@ -4392,6 +4411,7 @@ class TestStreamBlock(WagtailTestUtils, SimpleTestCase):
             {
                 "label": "Test streamblock",
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "minNum": None,
                 "maxNum": None,
                 "blockCounts": {},
@@ -4737,6 +4757,7 @@ class TestPageChooserBlock(TestCase):
                 "label": "Test pagechooserblock",
                 "required": True,
                 "icon": "doc-empty-inverse",
+                "blockDefId": block.definition_prefix,
                 "helpText": "pick a page, any page",
                 "classname": "w-field w-field--model_choice_field w-field--admin_page_chooser",
                 "showAddCommentButton": True,
@@ -4940,6 +4961,7 @@ class TestStaticBlock(unittest.TestCase):
             {
                 "text": "Latest posts - This block doesn't need to be configured, it will be displayed automatically",
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "label": "Posts static block",
             },
         )
@@ -4961,6 +4983,7 @@ class TestStaticBlock(unittest.TestCase):
             {
                 "text": "Latest posts - This block doesn't need to be configured, it will be displayed automatically",
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "label": "Posts static block",
             },
         )
@@ -4981,6 +5004,7 @@ class TestStaticBlock(unittest.TestCase):
             {
                 "text": "Latest posts: this block has no options.",
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "label": "Latest posts",
             },
         )
@@ -5002,6 +5026,7 @@ class TestStaticBlock(unittest.TestCase):
             {
                 "text": "Posts static block: this block has no options.",
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "label": "Posts static block",
             },
         )
@@ -5023,6 +5048,7 @@ class TestStaticBlock(unittest.TestCase):
             {
                 "html": "<b>Latest posts</b> - This block doesn't need to be configured, it will be displayed automatically",
                 "icon": "placeholder",
+                "blockDefId": block.definition_prefix,
                 "label": "Posts static block",
             },
         )
@@ -5077,6 +5103,7 @@ class TestDateBlock(TestCase):
                 "label": "Test dateblock",
                 "required": True,
                 "icon": "date",
+                "blockDefId": block.definition_prefix,
                 "classname": "w-field w-field--date_field w-field--admin_date_input",
                 "showAddCommentButton": True,
                 "strings": {"ADD_COMMENT": "Add Comment"},
@@ -5110,6 +5137,7 @@ class TestTimeBlock(TestCase):
                 "label": "Test timeblock",
                 "required": True,
                 "icon": "time",
+                "blockDefId": block.definition_prefix,
                 "classname": "w-field w-field--time_field w-field--admin_time_input",
                 "showAddCommentButton": True,
                 "strings": {"ADD_COMMENT": "Add Comment"},
@@ -5143,6 +5171,7 @@ class TestDateTimeBlock(TestCase):
                 "label": "Test datetimeblock",
                 "required": True,
                 "icon": "date",
+                "blockDefId": block.definition_prefix,
                 "classname": "w-field w-field--date_time_field w-field--admin_date_time_input",
                 "showAddCommentButton": True,
                 "strings": {"ADD_COMMENT": "Add Comment"},