Index: clang/docs/ClangFormatStyleOptions.rst
===================================================================
--- clang/docs/ClangFormatStyleOptions.rst
+++ clang/docs/ClangFormatStyleOptions.rst
@@ -4746,6 +4746,18 @@
      true:                                  false:
      class Foo : Bar {}             vs.     class Foo: Bar {}
 
+.. _SpaceBeforeJsonColon:
+
+**SpaceBeforeJsonColon** (``Boolean``) :versionbadge:`clang-format 17` :ref:`¶ <SpaceBeforeJsonColon>`
+  If ``true``, a space will be add before a json colon
+
+  .. code-block:: c++
+
+     true:                                  false:
+     {                                      {
+       "key" : "value"              vs.       "key": "value"
+     }                                      }
+
 .. _SpaceBeforeParens:
 
 **SpaceBeforeParens** (``SpaceBeforeParensStyle``) :versionbadge:`clang-format 3.5` :ref:`¶ <SpaceBeforeParens>`
Index: clang/include/clang/Format/Format.h
===================================================================
--- clang/include/clang/Format/Format.h
+++ clang/include/clang/Format/Format.h
@@ -3714,6 +3714,16 @@
   /// \version 7
   bool SpaceBeforeInheritanceColon;
 
+  /// If ``true``, a space will be add before a json colon 
+  /// \code
+  ///    true:                                  false:
+  ///    {                                      {
+  ///      "key" : "value"              vs.       "key": "value"
+  ///    }                                      }
+  /// \endcode
+  /// \version 17
+  bool SpaceBeforeJsonColon;
+
   /// Different ways to put a space before opening parentheses.
   enum SpaceBeforeParensStyle : int8_t {
     /// Never put a space before opening parentheses.
@@ -4323,6 +4333,7 @@
            SpaceBeforeCtorInitializerColon ==
                R.SpaceBeforeCtorInitializerColon &&
            SpaceBeforeInheritanceColon == R.SpaceBeforeInheritanceColon &&
+           SpaceBeforeJsonColon == R.SpaceBeforeJsonColon &&
            SpaceBeforeParens == R.SpaceBeforeParens &&
            SpaceBeforeParensOptions == R.SpaceBeforeParensOptions &&
            SpaceAroundPointerQualifiers == R.SpaceAroundPointerQualifiers &&
Index: clang/lib/Format/Format.cpp
===================================================================
--- clang/lib/Format/Format.cpp
+++ clang/lib/Format/Format.cpp
@@ -1006,6 +1006,7 @@
                    Style.SpaceBeforeCtorInitializerColon);
     IO.mapOptional("SpaceBeforeInheritanceColon",
                    Style.SpaceBeforeInheritanceColon);
+    IO.mapOptional("SpaceBeforeJsonColon", Style.SpaceBeforeJsonColon);
     IO.mapOptional("SpaceBeforeParens", Style.SpaceBeforeParens);
     IO.mapOptional("SpaceBeforeParensOptions", Style.SpaceBeforeParensOptions);
     IO.mapOptional("SpaceBeforeRangeBasedForLoopColon",
@@ -1429,6 +1430,7 @@
   LLVMStyle.SpaceBeforeCaseColon = false;
   LLVMStyle.SpaceBeforeCtorInitializerColon = true;
   LLVMStyle.SpaceBeforeInheritanceColon = true;
+  LLVMStyle.SpaceBeforeJsonColon = false;
   LLVMStyle.SpaceBeforeParens = FormatStyle::SBPO_ControlStatements;
   LLVMStyle.SpaceBeforeParensOptions = {};
   LLVMStyle.SpaceBeforeParensOptions.AfterControlStatements = true;
Index: clang/lib/Format/TokenAnnotator.cpp
===================================================================
--- clang/lib/Format/TokenAnnotator.cpp
+++ clang/lib/Format/TokenAnnotator.cpp
@@ -3629,8 +3629,6 @@
       Right.MatchingParen->is(TT_CastRParen)) {
     return true;
   }
-  if (Style.isJson() && Left.is(tok::string_literal) && Right.is(tok::colon))
-    return false;
   if (Left.is(Keywords.kw_assert) && Style.Language == FormatStyle::LK_Java)
     return true;
   if (Style.ObjCSpaceAfterProperty && Line.Type == LT_ObjCProperty &&
@@ -4154,7 +4152,7 @@
       return Right.hasWhitespaceBefore();
   } else if (Style.isJson()) {
     if (Right.is(tok::colon))
-      return false;
+      return Style.SpaceBeforeJsonColon;
   } else if (Style.isCSharp()) {
     // Require spaces around '{' and  before '}' unless they appear in
     // interpolated strings. Interpolated strings are merged into a single token
Index: clang/unittests/Format/FormatTestJson.cpp
===================================================================
--- clang/unittests/Format/FormatTestJson.cpp
+++ clang/unittests/Format/FormatTestJson.cpp
@@ -236,5 +236,20 @@
                      Style);
 }
 
+TEST_F(FormatTestJson, SpaceBeforeJsonColon) {
+  FormatStyle Style = getLLVMStyle(FormatStyle::LK_Json);
+  verifyFormatStable("{\n"
+                     "  \"name\": 1\n"
+                     "}",
+                     Style);
+
+  Style.SpaceBeforeJsonColon = true;
+  verifyFormatStable("{}", Style);
+  verifyFormatStable("{\n"
+                     "  \"name\" : 1\n"
+                     "}",
+                     Style);
+}
+
 } // namespace format
 } // end namespace clang