diff --git a/midas/cli/main.py b/midas/cli/main.py
index 220cca9..e683897 100644
--- a/midas/cli/main.py
+++ b/midas/cli/main.py
@@ -3,7 +3,7 @@ import json
 import logging
 from dataclasses import dataclass
 from pathlib import Path
-from typing import Optional, TextIO
+from typing import Optional, TextIO, get_args
 
 import click
 
@@ -13,7 +13,13 @@ from midas.ast.location import Location
 from midas.ast.printer import MidasAstPrinter, PythonAstPrinter
 from midas.checker.checker import Checker
 from midas.checker.diagnostic import Diagnostic
-from midas.cli.highlighter import DiagnosticsHighlighter, Highlighter, MidasHighlighter, PythonHighlighter
+from midas.checker.types import Type
+from midas.cli.highlighter import (
+    DiagnosticsHighlighter,
+    Highlighter,
+    MidasHighlighter,
+    PythonHighlighter,
+)
 from midas.lexer.midas import MidasLexer
 from midas.lexer.token import Token, TokenType
 from midas.parser.midas import MidasParser
@@ -46,7 +52,9 @@ def compile(highlight: Optional[TextIO], file: TextIO):
     print(
         json.dumps(
             UniversalJSONDumper.dump(
-                checker.global_env, [("Environment", "_children")]
+                checker.global_env,
+                [("Environment", "_children")],
+                lambda obj: isinstance(obj, get_args(Type)),
             ),
             indent=4,
         )
diff --git a/midas/utils.py b/midas/utils.py
index 0c387e2..bf10b95 100644
--- a/midas/utils.py
+++ b/midas/utils.py
@@ -1,18 +1,27 @@
-from typing import Any, Optional
+from typing import Any, Callable, Optional
+
+AllowRepeat = Callable[[object], bool]
 
 
 class UniversalJSONDumper:
     @classmethod
     def dump(
-        cls, obj: Any, include_keys: Optional[list[str | tuple[str, str]]] = None
+        cls,
+        obj: Any,
+        include_keys: Optional[list[str | tuple[str, str]]] = None,
+        allow_repeat: Optional[AllowRepeat] = None,
     ) -> Any:
         if include_keys is None:
             include_keys = []
-        return cls._dump(obj, include_keys, [])
+        return cls._dump(obj, include_keys, allow_repeat, [])
 
     @classmethod
     def _dump(
-        cls, obj: Any, include_keys: list[str | tuple[str, str]], visited: list[Any]
+        cls,
+        obj: Any,
+        include_keys: list[str | tuple[str, str]],
+        allow_repeat: Optional[AllowRepeat],
+        visited: list[Any],
     ) -> Any:
         if obj in visited:
             return None
@@ -20,17 +29,22 @@ class UniversalJSONDumper:
             case str() | int() | float() | None:
                 return obj
             case list() | set() | tuple():
-                return [cls._dump(child, include_keys, visited) for child in obj]
+                return [
+                    cls._dump(child, include_keys, allow_repeat, visited)
+                    for child in obj
+                ]
             case dict():
                 return {
-                    str(k): cls._dump(v, include_keys, visited) for k, v in obj.items()
+                    str(k): cls._dump(v, include_keys, allow_repeat, visited)
+                    for k, v in obj.items()
                 }
             case object():
-                visited.append(obj)
+                if allow_repeat is None or not allow_repeat(obj):
+                    visited.append(obj)
                 return {
                     "_type": obj.__class__.__name__,
                 } | {
-                    k: cls._dump(v, include_keys, visited)
+                    k: cls._dump(v, include_keys, allow_repeat, visited)
                     for k, v in obj.__dict__.items()
                     if not k.startswith("_")
                     or k in include_keys