diff --git a/packages/elements/src/__fixtures__/operations/put-todos.ts b/packages/elements/src/__fixtures__/operations/put-todos.ts
index 36607dda83..6a195a0978 100644
--- a/packages/elements/src/__fixtures__/operations/put-todos.ts
+++ b/packages/elements/src/__fixtures__/operations/put-todos.ts
@@ -373,6 +373,35 @@ export const httpOperation: IHttpOperation = {
         name: 'account-id',
         style: HttpParamStyles.Simple,
         required: true,
+        examples: [
+          {
+            value: 'example id',
+            key: 'example',
+          },
+        ],
+      },
+      {
+        schema: {
+          type: 'string',
+          description: 'Your Stoplight account id',
+        },
+        name: 'message-id',
+        style: HttpParamStyles.Simple,
+        required: true,
+        examples: [
+          {
+            value: 'example value',
+            key: 'example 1',
+          },
+          {
+            value: 'another example',
+            key: 'example 2',
+          },
+          {
+            value: 'something else',
+            key: 'example 3',
+          },
+        ],
       },
     ],
     path: [
diff --git a/packages/elements/src/components/TryIt/BasicSend.tsx b/packages/elements/src/components/TryIt/BasicSend.tsx
index 638bf5c607..cef7daad94 100644
--- a/packages/elements/src/components/TryIt/BasicSend.tsx
+++ b/packages/elements/src/components/TryIt/BasicSend.tsx
@@ -7,7 +7,7 @@ import * as React from 'react';
 
 import { HttpCodeDescriptions } from '../../constants';
 import { getHttpCodeColor } from '../../utils/http';
-import { OperationParameters } from './OperationParameters';
+import { initialParameterValues, OperationParameters } from './OperationParameters';
 
 export interface BasicSendProps {
   httpOperation: IHttpOperation;
@@ -32,7 +32,9 @@ export const BasicSend: React.FC<BasicSendProps> = ({ httpOperation }) => {
     headers: httpOperation.request?.headers,
   };
 
-  const [parameterValues, setParameterValues] = React.useState<Dictionary<string, string>>({});
+  const [parameterValues, setParameterValues] = React.useState<Dictionary<string, string>>(
+    initialParameterValues(operationParameters),
+  );
 
   if (!server) return null;
 
diff --git a/packages/elements/src/components/TryIt/OperationParameters.tsx b/packages/elements/src/components/TryIt/OperationParameters.tsx
index bd51c47d50..d163220094 100644
--- a/packages/elements/src/components/TryIt/OperationParameters.tsx
+++ b/packages/elements/src/components/TryIt/OperationParameters.tsx
@@ -1,9 +1,16 @@
-import { Flex, Input, Panel, Text } from '@stoplight/mosaic';
-import { Dictionary, IHttpHeaderParam, IHttpPathParam, IHttpQueryParam } from '@stoplight/types';
-import { sortBy } from 'lodash';
+import { Flex, Input, Panel, Select, Text } from '@stoplight/mosaic';
+import {
+  Dictionary,
+  IHttpHeaderParam,
+  IHttpPathParam,
+  IHttpQueryParam,
+  INodeExample,
+  INodeExternalExample,
+} from '@stoplight/types';
+import { map, sortBy } from 'lodash';
 import * as React from 'react';
 
-interface OperationParameters {
+export interface OperationParameters {
   path?: IHttpPathParam[];
   query?: IHttpQueryParam[];
   headers?: IHttpHeaderParam[];
@@ -15,37 +22,111 @@ interface OperationParametersProps {
   onChangeValues: (newValues: Dictionary<string, string>) => void;
 }
 
+const booleanOptions = [
+  { label: 'Not Set', value: '' },
+  { label: 'False', value: 'false' },
+  { label: 'True', value: 'true' },
+];
+
+export function flattenParameters(parameters: OperationParameters) {
+  const pathParameters = sortBy(parameters.path ?? [], ['name']);
+  const queryParameters = sortBy(parameters.query ?? [], ['name']);
+  const headerParameters = sortBy(parameters.headers ?? [], ['name']);
+  return [...pathParameters, ...queryParameters, ...headerParameters];
+}
+
+export function initialParameterValues(operationParameters: OperationParameters) {
+  const parameters = flattenParameters(operationParameters);
+  const enums = parameters
+    .filter(p => p.schema?.enum)
+    .reduce((params, p) => {
+      if (p.schema?.enum?.length) {
+        return { ...params, [p.name]: String(p.schema?.enum[0]) };
+      } else {
+        return { ...params };
+      }
+    }, {});
+  const examples = parameters
+    .filter(p => Array.isArray(p.examples))
+    .reduce((params, p) => {
+      if (p.examples?.length) {
+        return {
+          ...params,
+          [p.name]: exampleValue(p.examples[0]),
+        };
+      } else {
+        return { ...params };
+      }
+    }, {});
+
+  return {
+    // order matters - enums should be override examples
+    ...examples,
+    ...enums,
+  };
+}
+
+function exampleValue(example: INodeExample | INodeExternalExample) {
+  return 'value' in example
+    ? (example as INodeExample).value
+    : 'externalValue' in example
+    ? (example as INodeExternalExample).externalValue
+    : '';
+}
+
 export const OperationParameters: React.FC<OperationParametersProps> = ({
   operationParameters,
   values,
   onChangeValues,
 }) => {
-  const pathParameters = sortBy(operationParameters.path ?? [], ['name']);
-  const queryParameters = sortBy(operationParameters.query ?? [], ['name']);
-  const headerParameters = sortBy(operationParameters.headers ?? [], ['name']);
-  const parameters = [...pathParameters, ...queryParameters, ...headerParameters];
+  const parameters = flattenParameters(operationParameters);
+
+  const onChange = React.useCallback(
+    parameter => (e: React.FormEvent<HTMLSelectElement> | React.ChangeEvent<HTMLInputElement>) => {
+      const newValue = e.currentTarget.value;
+      onChangeValues({ ...values, [parameter.name]: newValue });
+    },
+    [onChangeValues, values],
+  );
 
   return (
     <Panel id="collapse-open" defaultIsOpen>
       <Panel.Titlebar>Parameters</Panel.Titlebar>
       <Panel.Content className="sl-overflow-y-auto OperationParametersContent">
         {parameters.map(parameter => {
+          const options =
+            parameter.schema?.type === 'boolean'
+              ? booleanOptions
+              : parameter.schema?.enum !== undefined
+              ? map(parameter.schema.enum, v => {
+                  return Number.isNaN(Number(v)) ? String(v) : Number(v);
+                })
+              : null;
+          const exampleOptions =
+            parameter.examples?.length && parameter.examples.length > 1
+              ? parameter.examples.map(example => ({ label: example.key, value: exampleValue(example) }))
+              : null;
           return (
-            <Flex key={parameter.name} alignItems="center">
+            <Flex align="center" key={parameter.name}>
               <Input appearance="minimal" readOnly value={parameter.name} />
               <Text mx={3}>:</Text>
-              <Input
-                appearance="minimal"
-                flexGrow
-                placeholder={parameter.schema?.type as string}
-                type={parameter.schema?.type as string}
-                required
-                value={values[parameter.name] ?? ''}
-                onChange={e => {
-                  const newValue = e.currentTarget.value;
-                  onChangeValues({ ...values, [parameter.name]: newValue });
-                }}
-              />
+              {options ? (
+                <Select flexGrow options={options} value={values[parameter.name]} onChange={onChange(parameter)} />
+              ) : (
+                <Flex flexGrow>
+                  <Input
+                    style={{ paddingLeft: 15 }}
+                    appearance="minimal"
+                    flexGrow
+                    placeholder={(parameter.schema?.default ?? parameter.schema?.type) as string}
+                    type={parameter.schema?.type as string}
+                    required
+                    value={values[parameter.name] ?? ''}
+                    onChange={onChange(parameter)}
+                  />
+                  {exampleOptions && <Select flexGrow options={exampleOptions} onChange={onChange(parameter)} />}
+                </Flex>
+              )}
             </Flex>
           );
         })}
diff --git a/packages/elements/src/components/TryIt/__tests__/parameters.test.ts b/packages/elements/src/components/TryIt/__tests__/parameters.test.ts
new file mode 100644
index 0000000000..f2bf3ffac2
--- /dev/null
+++ b/packages/elements/src/components/TryIt/__tests__/parameters.test.ts
@@ -0,0 +1,22 @@
+import { httpOperation } from '../../../__fixtures__/operations/put-todos';
+import { initialParameterValues } from '../OperationParameters';
+
+describe('Parameters', () => {
+  it('should fill initial parameters', () => {
+    const operationParameters = {
+      path: httpOperation.request?.path,
+      query: httpOperation.request?.query,
+      headers: httpOperation.request?.headers,
+    };
+
+    const parameters = initialParameterValues(operationParameters);
+
+    expect(parameters).toMatchObject({
+      limit: '0',
+      type: 'something',
+      value: '0',
+      'account-id': 'example id',
+      'message-id': 'example value',
+    });
+  });
+});