Forward to v1.4.2

CHANGELOG.md

@@ -1,5 +1,6 @@
 # 1.4.2 (Unreleased)
 
+* `function/stdlib`: The `jsonencode` function will now correctly accept a null as its argument, and produce the JSON representation `"null"` rather than returning an error. ([#54](https://github.com/zclconf/go-cty/pull/54))
 * `convert`: Don't panic when asked to convert a tuple of objects to a list type constraint containing a nested `cty.DynamicPseudoType`. ([#53](https://github.com/zclconf/go-cty/pull/53))
 
 # 1.4.1 (March 5, 2025)

cty/function/stdlib/json.go

@@ -12,6 +12,7 @@ var JSONEncodeFunc = function.New(&function.Spec{
 			Name:             "val",
 			Type:             cty.DynamicPseudoType,
 			AllowDynamicType: true,
+			AllowNull:        true,
 		},
 	},
 	Type: function.StaticReturnType(cty.String),
@@ -24,6 +25,10 @@ var JSONEncodeFunc = function.New(&function.Spec{
 			return cty.UnknownVal(retType), nil
 		}
 
+		if val.IsNull() {
+			return cty.StringVal("null"), nil
+		}
+
 		buf, err := json.Marshal(val, val.Type())
 		if err != nil {
 			return cty.NilVal, err

cty/function/stdlib/json_test.go

@@ -52,6 +52,10 @@ func TestJSONEncode(t *testing.T) {
 			cty.DynamicVal,
 			cty.UnknownVal(cty.String),
 		},
+		{
+			cty.NullVal(cty.String),
+			cty.StringVal("null"),
+		},
 	}
 
 	for _, test := range tests {