diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 0336396..3070f04 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -47,7 +47,7 @@ jobs:
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
-        # By default, queries listed here will override any specified in a config file. 
+        # By default, queries listed here will override any specified in a config file.
         # Prefix the list here with "+" to use these queries and those in the config file.
         # queries: ./path/to/local/query, your-org/your-repo/queries@main
 
diff --git a/.pre-commit-hooks.yaml b/.pre-commit-hooks.yaml
index 5fba034..b0e768b 100644
--- a/.pre-commit-hooks.yaml
+++ b/.pre-commit-hooks.yaml
@@ -11,7 +11,7 @@
   description: This hook checks AutoPkg recipes to ensure they contain required top-level keys.
   entry: check-autopkg-recipes
   language: python
-  files: '\.recipe$'
+  files: '\.recipe(\.plist|\.yaml|\.json)?$'
   types: [text]
 
 - id: check-git-config-email
@@ -97,7 +97,7 @@
   description: This hook prevents AutoPkg overrides from being added to the repo.
   entry: forbid-autopkg-overrides
   language: python
-  files: '\.recipe$'
+  files: '\.recipe(\.plist|\.yaml|\.json)?$'
   types: [text]
 
 - id: forbid-autopkg-trust-info
@@ -105,7 +105,7 @@
   description: This hook prevents AutoPkg recipes with trust info from being added to the repo.
   entry: forbid-autopkg-trust-info
   language: python
-  files: '\.recipe$'
+  files: '\.recipe(\.plist|\.yaml|\.json)?$'
   types: [text]
 
 - id: munki-makecatalogs
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7114d69..f39c68c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,17 @@
 
 All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [1.10.0] - 2021-02-21
+
+### Added
+- In anticipation of AutoPkg 2.3, now supports checking YAML recipes (must have extension `.recipe.yaml`).
+- In anticipation of AutoPkg 2.3, supports additional AutoPkg plist extension `.recipe.plist`.
+- Supports JSON AutoPkg recipes (must have extension `.recipe.json`). NOTE: AutoPkg itself does not yet support JSON recipes.
+- Built placeholder for checking for unused AutoPkg recipe input variables in the future. Check is disabled for now.
+
+### Fixed
+- Fixed a bug preventing display of AutoPkg recipe path and identifier if duplicate identifier is found in the repo.
+
 ## [1.9.0] - 2021-01-18
 
 ### Added
diff --git a/README.md b/README.md
index 1011165..7946791 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ For any hook in this repo you wish to use, add the following to your pre-commit
 
 ```yaml
 -   repo: https://github.com/homebysix/pre-commit-macadmin
-    rev: v1.9.0
+    rev: v1.10.0
     hooks:
     -   id: check-plists
     # -   id: ...
@@ -121,7 +121,7 @@ When combining arguments that take lists (for example: `--required-keys`, `--cat
 
 ```yaml
 -   repo: https://github.com/homebysix/pre-commit-macadmin
-    rev: v1.9.0
+    rev: v1.10.0
     hooks:
     -   id: check-munki-pkgsinfo
         args: ['--catalogs', 'testing', 'stable', '--']
@@ -131,7 +131,7 @@ But if you also use the `--categories` argument, you would move the trailing `--
 
 ```yaml
 -   repo: https://github.com/homebysix/pre-commit-macadmin
-    rev: v1.9.0
+    rev: v1.10.0
     hooks:
     -   id: check-munki-pkgsinfo
         args: ['--catalogs', 'testing', 'stable', '--categories', 'Design', 'Engineering', 'Web Browsers', '--']
@@ -143,7 +143,7 @@ If it looks better to your eye, feel free to use a multi-line list for long argu
 
 ```yaml
 -   repo: https://github.com/homebysix/pre-commit-macadmin
-    rev: v1.9.0
+    rev: v1.10.0
     hooks:
     -   id: check-munki-pkgsinfo
         args: [
diff --git a/pre_commit_hooks/check_autopkg_recipes.py b/pre_commit_hooks/check_autopkg_recipes.py
index 09984e0..f339139 100755
--- a/pre_commit_hooks/check_autopkg_recipes.py
+++ b/pre_commit_hooks/check_autopkg_recipes.py
@@ -4,6 +4,7 @@
 requirements."""
 
 import argparse
+import json
 import os
 import plistlib
 import sys
@@ -11,6 +12,8 @@
 from distutils.version import LooseVersion
 from xml.parsers.expat import ExpatError
 
+from ruamel import yaml
+
 from pre_commit_hooks.util import (
     validate_pkginfo_key_types,
     validate_required_keys,
@@ -280,6 +283,30 @@ def validate_no_superclass_procs(process, filename):
     return passed
 
 
+# def validate_unused_input_vars(recipe, recipe_text, filename):
+#     """Warn if any input variables are not referenced in the recipe."""
+
+#     # List of variables that are commonly allowed to be unreferenced (lowercase).
+#     ignored_vars = (
+#         "name",
+#         "pkginfo",
+#     )
+
+#     passed = True
+#     for input_var, _ in recipe.get("Input", {}).items():
+#         if input_var.lower() in ignored_vars:
+#             continue
+#         subst = "%" + input_var + "%"
+#         if subst not in recipe_text:
+#             print(
+#                 "{}: WARNING: Input variable {} not referenced in recipe.".format(
+#                     filename, input_var
+#                 )
+#             )
+
+#     return passed
+
+
 def validate_no_var_in_app_path(process, filename):
     """Ensure %NAME% is not used in app paths that should be hard coded."""
 
@@ -458,14 +485,40 @@ def main(argv=None):
 
     retval = 0
     for filename in args.filenames:
-        try:
-            with open(filename, "rb") as openfile:
-                recipe = plistlib.load(openfile)
 
-        except (ExpatError, ValueError) as err:
-            print("{}: plist parsing error: {}".format(filename, err))
-            retval = 1
-            break  # No need to continue checking this file
+        if filename.endswith(".yaml"):
+            try:
+                # try to read it as yaml
+                with open(filename, "rb") as f:
+                    recipe = yaml.safe_load(f)
+            except Exception as err:
+                print("{}: yaml parsing error: {}".format(filename, err))
+                retval = 1
+                break  # No need to continue checking this file
+
+        elif filename.endswith(".json"):
+            try:
+                # try to read it as json
+                with open(filename, "rb") as f:
+                    recipe = json.load(f)
+            except Exception as err:
+                print("{}: json parsing error: {}".format(filename, err))
+                retval = 1
+                break  # No need to continue checking this file
+
+        else:
+            try:
+                # try to read it as a plist
+                with open(filename, "rb") as f:
+                    recipe = plistlib.load(f)
+            except Exception as err:
+                print("{}: plist parsing error: {}".format(filename, err))
+                retval = 1
+                break  # No need to continue checking this file
+
+        # For future implementation of validate_unused_input_vars()
+        # with open(filename, "r") as openfile:
+        #     recipe_text = openfile.read()
 
         # Top level keys that all AutoPkg recipes should contain.
         required_keys = ["Identifier"]
@@ -475,7 +528,11 @@ def main(argv=None):
 
         # Ensure the recipe identifier isn't duplicated.
         if recipe["Identifier"] in seen_identifiers:
-            print('{}: Identifier "{}" is shared by another recipe in this repo.')
+            print(
+                '{}: Identifier "{}" is shared by another recipe in this repo.'.format(
+                    filename, recipe["Identifier"]
+                )
+            )
             retval = 1
         else:
             seen_identifiers.append(recipe["Identifier"])
@@ -494,6 +551,13 @@ def main(argv=None):
             )
             retval = 1
 
+        # Validate that all input variables are used.
+        # (Disabled for now because it's a little too opinionated, and doesn't take into account
+        # whether environmental variables are used in custom processors.)
+        # if args.strict:
+        #     if not validate_unused_input_vars(recipe, recipe_text, filename):
+        #         retval = 1
+
         # If the Input key contains a pkginfo dict, make a best effort to validate its contents.
         input_key = recipe.get("Input", recipe.get("input", recipe.get("INPUT")))
         if input_key and "pkginfo" in input_key:
diff --git a/setup.py b/setup.py
index 9e13a28..42c6d8e 100755
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
     name="pre-commit-macadmin",
     description="Pre-commit hooks for Mac admins, client engineers, and IT consultants.",
     url="https://github.com/homebysix/pre-commit-macadmin",
-    version="1.9.0",
+    version="1.10.0",
     author="Elliot Jordan",
     author_email="elliot@elliotjordan.com",
     packages=["pre_commit_hooks"],