diff --git a/examples/demo.json b/examples/demo.json
new file mode 100644
index 00000000..cf3f61b7
--- /dev/null
+++ b/examples/demo.json
@@ -0,0 +1,99 @@
+{
+    "config": {
+        "name": "demo with complex mechanisms",
+        "base_url": "https://postman-echo.com",
+        "variables": {
+            "a": 12.3,
+            "b": 3.45,
+            "n": 5,
+            "varFoo1": "${gen_random_string($n)}",
+            "varFoo2": "${max($a, $b)}"
+        }
+    },
+    "teststeps": [
+        {
+            "name": "get with params",
+            "request": {
+                "method": "GET",
+                "url": "/get",
+                "params": {
+                    "foo1": "$varFoo1",
+                    "foo2": "$varFoo2"
+                },
+                "headers": {
+                    "User-Agent": "HttpBoomer"
+                }
+            },
+            "variables": {
+                "b": 34.5,
+                "n": 3,
+                "varFoo2": "${max($a, $b)}"
+            },
+            "extract": {
+                "varFoo1": "body.args.foo1"
+            },
+            "validate": [
+                {
+                    "check": "status_code",
+                    "assert": "equals",
+                    "expect": 200,
+                    "msg": "check response status code"
+                },
+                {
+                    "check": "headers.\"Content-Type\"",
+                    "assert": "startswith",
+                    "expect": "application/json"
+                },
+                {
+                    "check": "body.args.foo1",
+                    "assert": "length_equals",
+                    "expect": 5,
+                    "msg": "check args foo1"
+                },
+                {
+                    "check": "$varFoo1",
+                    "assert": "length_equals",
+                    "expect": 5,
+                    "msg": "check args foo1"
+                },
+                {
+                    "check": "body.args.foo2",
+                    "assert": "equals",
+                    "expect": "34.5",
+                    "msg": "check args foo2"
+                }
+            ]
+        },
+        {
+            "name": "post json data",
+            "request": {
+                "method": "POST",
+                "url": "/post",
+                "json": {
+                    "foo1": "$varFoo1",
+                    "foo2": "${max($a, $b)}"
+                }
+            },
+            "validate": [
+                {
+                    "check": "status_code",
+                    "assert": "equals",
+                    "expect": 200,
+                    "msg": "check status code"
+                },
+                {
+                    "check": "body.json.foo1",
+                    "assert": "length_equals",
+                    "expect": 5,
+                    "msg": "check args foo1"
+                },
+                {
+                    "check": "body.json.foo2",
+                    "assert": "equals",
+                    "expect": 12.3,
+                    "msg": "check args foo2"
+                }
+            ]
+        }
+    ]
+}
\ No newline at end of file
diff --git a/examples/demo.yaml b/examples/demo.yaml
new file mode 100644
index 00000000..c5c01b44
--- /dev/null
+++ b/examples/demo.yaml
@@ -0,0 +1,65 @@
+config:
+    name: demo with complex mechanisms
+    base_url: https://postman-echo.com
+    variables:
+        a: 12.3
+        b: 3.45
+        "n": 5
+        varFoo1: ${gen_random_string($n)}
+        varFoo2: ${max($a, $b)}
+teststeps:
+    - name: get with params
+      request:
+        method: GET
+        url: /get
+        params:
+            foo1: $varFoo1
+            foo2: $varFoo2
+        headers:
+            User-Agent: HttpBoomer
+      variables:
+        b: 34.5
+        "n": 3
+        varFoo2: ${max($a, $b)}
+      extract:
+        varFoo1: body.args.foo1
+      validate:
+        - check: status_code
+          assert: equals
+          expect: 200
+          msg: check response status code
+        - check: headers."Content-Type"
+          assert: startswith
+          expect: application/json
+        - check: body.args.foo1
+          assert: length_equals
+          expect: 5
+          msg: check args foo1
+        - check: $varFoo1
+          assert: length_equals
+          expect: 5
+          msg: check args foo1
+        - check: body.args.foo2
+          assert: equals
+          expect: "34.5"
+          msg: check args foo2
+    - name: post json data
+      request:
+        method: POST
+        url: /post
+        json:
+            foo1: $varFoo1
+            foo2: ${max($a, $b)}
+      validate:
+        - check: status_code
+          assert: equals
+          expect: 200
+          msg: check status code
+        - check: body.json.foo1
+          assert: length_equals
+          expect: 5
+          msg: check args foo1
+        - check: body.json.foo2
+          assert: equals
+          expect: 12.3
+          msg: check args foo2