# Define global parameters

Use the `x-speakeasy-globals` extension to define parameters that can be configured globally on the main SDK instance. These parameters will be automatically populated for any operations that use them. This is especially useful for configurations that are required across all operations, such as customer IDs.

```yaml
openapi: 3.1.0
info:
  title: Test
  version: 0.0.1
servers:
  - url: https://httpbin.org
x-speakeasy-globals:
  parameters:
    - name: customerId
      in: path
      schema:
        type: string
paths:
  /api/{customerId}:
    get:
      operationId: getTest
      parameters:
        - name: customerId # If this matches a global parameter it will be populated automatically
          in: path
          schema:
            type: string
          required: true
      responses:
        "200":
          description: OK
```

If the `name`, `in`, and `schema` values of a global parameter match a parameter in an operation, the global parameter will be populated automatically. If the global parameter is not used in the operation, it will be ignored.

## Preferred method: Using component references

The preferred way to define global parameters is by referencing a component. This ensures consistency and reusability:

```yaml
openapi: 3.1.0
info:
  title: Test
  version: 0.0.1
servers:
  - url: https://httpbin.org
x-speakeasy-globals:
  parameters:
    - $ref: "#/components/parameters/CustomerId"
paths:
  /api/{customerId}:
    get:
      operationId: getTest
      parameters:
        - $ref: "#/components/parameters/CustomerId"
      responses:
        "200":
          description: OK
components:
  parameters:
    CustomerId:
      name: customerId
      in: path
      schema:
        type: string
```

## Supported parameter types

Global parameters can be used with `in: query`, `in: path`, or `in: header` fields. Only primitive types such as `string`, `number`, `integer`, `boolean`, and `enums` are supported for global parameters.

The global parameter definitions in the sample above will generate the following output:

<CodeWithTabs client:visible
  tabs={[
    {
      label: "TypeScript",
      language: "typescript",
      code: `import { Speakeasybar } from "speakeasy";

  async function run() {
      const sdk = new Speakeasybar({
          customerId: "1291fbe8-4afb-4357-b1de-356b65c417ca", // customerId can be set when instantiating the SDK and is used for all compatible operations
      });

      const result = await sdk.getCustomer({});

      // Handle the result
      console.log(result);
  }

  run();`,
    },
    {
      label: "Python",
      language: "python",
      code: `import speakeasy
  from speakeasy.models import operations

  s = speakeasy.SDK(
      customer_id='1291fbe8-4afb-4357-b1de-356b65c417ca', # customer_id can be set when instantiating the SDK and is used for all compatible operations
  )

  req = operations.GetCustomerRequest()

  res = s.get_customer(req)

  if res is not None:
      # handle response
      pass`,
    },
    {
      label: "Go",
      language: "go",
      code: `package main

  public class Application {

      public static void main(String[] args) {
          try {
              SDK sdk = SDK.builder()
                  .customerId("1291fbe8-4afb-4357-b1de-356b65c417ca") // customerId can be set when instantiating the SDK and is used for all compatible operations
                  .build();

              GetCustomerRequest req = GetCustomerRequest.builder()
                  .build();

              GetCustomerResponse res = sdk.getCustomer()
                  .request(req)
                  .call();

              // handle response
          } catch (org.openapis.openapi.models.errors.SDKError e) {
              // handle exception
          } catch (Exception e) {
              // handle exception
          }
      }
  }`,
    },
    {
      label: "C#",
      language: "csharp",
      code: `using Openapi;
  using Openapi.Models.Components;
  using Openapi.Models.Operations;

  var sdk = new SDK(
      customerId: "1291fbe8-4afb-4357-b1de-356b65c417ca");

  try {
    var res = await sdk.GetCustomer(new GetCustomerRequest());
    // handle response
  } catch (SDKException ex) {
    // handle exception
  }`,
    },
    {
      label: "PHP",
      language: "php",
      code: `<?php

  declare(strict_types=1);

  require 'vendor/autoload.php';

  use OpenAPI\\OpenAPI;
  use OpenAPI\\OpenAPI\\Models\\Components;
  use OpenAPI\\OpenAPI\\Models\\Operations;

  $sdk = OpenAPI\\SDK::builder()->setCustomerId("1291fbe8-4afb-4357-b1de-356b65c417ca")->build();

  try {
    $response = $sdk->getCustomer(request=new GetCusomterRequest());
    // handle response
  } catch (OpenAPI\\ErrorThrowable $e) {
    // handle exception
  }`,
    },
    {
      label: "Ruby",
      language: "ruby",
      code: `require 'openapi'

    Models = ::OpenApiSDK::Models

    s = ::OpenApiSDK::SDK.new(
      customer_id: "1291fbe8-4afb-4357-b1de-356b65c417ca"
    )

    begin
      response = s.get_customer(request: Models::Operations::GetCustomerRequest.new)
      # handle response
    rescue Models::Errors::APIError => e
      # handle exception
      raise e
    end`,
}
]}
/>

## Hiding global parameters from method signatures

<Callout type="warning" title="Limited Support">
  Currently, this feature is only supported in Go, Python, Java, and TypeScript.
</Callout>

To hide global parameters from method signatures, use the `x-speakeasy-globals-hidden` extension. This is useful when you want the global parameter to be set only once during SDK instantiation and not be overridden in individual operations.

```yaml
openapi: 3.1.0
info:
  title: Test
  version: 0.0.1
servers:
  - url: https://httpbin.org
x-speakeasy-globals:
  parameters:
    - name: customerId
      in: path
      schema:
        type: string
      x-speakeasy-globals-hidden: true # This will hide the global parameter from all operations
paths:
  /api/{customerId}:
    get:
      operationId: getTest
      parameters:
        - name: customerId
          in: path
          schema:
            type: string
          required: true
      responses:
        "200":
          description: OK
```

Control the visibility of the global parameter by setting `x-speakeasy-globals-hidden` to `true` on the global parameter definition or on the operation parameter that matches the global parameter. Setting it globally hides the parameter from all operations. Setting it on a specific operation hides it only for that operation.