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SDK customization options

The customizations section is used to customize your SDKs.

SettingTypeRequiredDefaultDescription
authenticationobjectN/ACustomization the API authentication settings
documentationobjectN/ACustomization the documentation generation settings
generateEnvbooltrueShould example .env files be generated?
licenseobjectN/AWhat license should the SDKs be covered under?
retryobjectN/ARetry functionality customization
environmentVariablesarrayN/AA list of environment variables to inject into the SDKs
refreshTokenobjectN/ARefresh token customization
environmentsarrayN/AA list of deployment environments
responseHeadersboolfalseShould response headers be included in the response object.
devContainerboolfalseShould the generated SDKs contain the files to be able to run it as a dev container
includeOptionalSnippetParametersbooltrueShould optional parameters be included in the code snippets in generated documentation
buildAllModelsboolfalseShould build models that are not directly used by the services
endpointCustomizationsobjectN/ACustomize an endpoint based on a path and method name
readmeobjectN/AOverwrites the SDK README description

authentication

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

The authentication options allow you to configure the authentication that your API uses, that is set using the auth options. This section is an object with the following options:

OptionTypeRequiredDefaultDescription
accessobjectN/ACustom access token authentication options
apiKeyobjectN/AAPI key authentication options

You can read more on authentication in our authentication guide.

access

The access options allow you to configure the custom access token that is sent to your API when the auth option is set to custom. This section is an object with the following options:

OptionTypeRequiredDefaultDescription
prefixstringN/AThe prefix to use for the custom access token authentication

prefix

The prefix is used to define a custom prefix when using an access token. By default when using custom access token authentication, the Authorization header is passed as Bearer <token>. For example, if your bearer token is Passw0rd123!, the header would be:

HeaderValue
AuthorizationBearer Passw0rd123!

By setting the prefix, you can replace Bearer with the value of your choice.

For example, if you have the following:

{
...
"auth": [
"custom"
],
"customizations": {
"authentication": {
"access": {
"prefix": "Token"
}
}
}
...
}

Then the header would be:

HeaderValue
AuthorizationToken Passw0rd123!

apiKey

The apiKey option is used to configure the API key authentication for the SDKs. This is used if the auth setting is set to apikey. This is an object with the following options:

OptionTypeRequiredDefaultDescription
headerstringX-API-KEYThe header to use for the API key authentication

The header option sets the header to use for the API key authentication. This is used by the SDKs to set the header when making requests to the API. For example, if you have the following:

{
...
"customizations": {
"authentication": {
"apiKey": {
"header": "MY_CUSTOM_APIKEY_HEADER"
}
}
}
...
}

Then the API key will be passed to your API using the MY_CUSTOM_APIKEY_HEADER header.

If this is not set, then API keys by default will be passed using the X-API-KEY header.

documentation

The documentation options allow you to configure the documentation that is generated with your SDK. You define what types of documentation is created using the the docs options. This section is an object with the following options:

OptionTypeRequiredDefaultDescription
snippetsobjectN/ASDK snippets customization options
enhancedApiSpecobjectN/AEnhanced OpenAPI spec customization options

You can read more about documentation generation in our documentation generation guide.

snippets

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

The snippets options allow you to configure the code snippets that are generated in the documentation. This is an object with the following options:

OptionTypeRequiredDefaultDescription
formatstringmarkdownThe format of the code snippets

format

The format of the code snippets that are generated in the documentation.

Valid values are:

ValueDescription
markdownGenerate snippets as markdown
jsonGenerate snippets as JSON

enhancedApiSpec

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

The enhancedApiSpec options allow you to configure the enhanced OpenAPI spec that is generated in the documentation. This is an object with the following options:

OptionTypeRequiredDefaultDescription
customOutputNamestringenhancedApiSpec.jsonThe format of the enhanced OpenAPI spec file

customOutputName

The format of the enhanced OpenAPI spec file.

Valid values are: <fileName>.json, <fileName>.yaml and <fileName>.yml

generateEnv

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

If this option is set to true, then an example .env file is created in the SDK with the name .env.example to set environment variables for authentication. This can be used by your SDK users to configure their environment variables.

For example, if you have an API that uses a bearer token then this will need to be passed to the SDK on initialization, and it is good practice for this to be read from an environment variable or other configuration instead of being hard coded.

This feature is not currently supported with TypeScript v2 SDKs.

license

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

The license option sets the open source license for the SDKs, if wanted. This is used in the LICENSE file that is created with the SDKs, as well as in the package manifests (such as the TypeScript package.json or Java pom.xml files). This is an object with the following options:

OptionTypeRequiredDefaultDescription
typestringNONEThe type of license to use. If this is not set, the default is to not set a license
urlstring""The URL of a custom license if the type is set to CUSTOM

type

The type of license - such as one of a set of popular licenses, or a custom license.

Valid values are:

ValueDescription
MITMIT
GPL3GPL 3.0
APACHEApache 2.0
NONENo license information will be set
CUSTOMUse a custom license

For example, to use an MIT license for your SDK:

{
...
"customizations": {
"license": {
"type": "MIT"
}
},
...
}

If you set this to CUSTOM, then you will need to set the url to the URL of the license file to use.

url

The URL to a custom license file. The liblab CLI will need to be able to access this file, so the remote URL will need to be public, for example a source-available Business Source License (BSL) license available publicly on your website or in a public GitHub repo.

This is only used if the type option is set to CUSTOM. For example, to point the SDK to a custom license file, use the following:

{
...
"customizations": {
"license": {
"type": "CUSTOM",
"url": "https://exciting.soda/sdk/license.txt"
}
},
...
}

You can find a list of OSI approved licenses on the Open Source Initiative licenses page.

retry

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

The retry setting is used to configure the retry functionality for the SDKs. This is an object with the following options:

OptionTypeRequiredDefaultDescription
enabledboolfalseShould retry functionality be enabled?
maxAttemptsinteger3The maximum number of attempts to retry
retryDelayinteger150The delay between retries in milliseconds

If this setting is not set, the SDKs will not have retry functionality enabled.

enabled

The enabled option determines whether or not retry functionality is enabled. If this is set to true, then the SDK will retry requests that fail due to network errors or server errors. If this is set to false, then the SDK will not retry requests.

maxAttempts

The maxAttempts option sets the maximum number of attempts to retry a request. For example, if this is set to 3, then the SDK will retry a request up to 3 times before giving up.

retryDelay

The retryDelay option sets the delay between retries in milliseconds. For example, if this is set to 150, then the SDK will wait 150 milliseconds between retries.

More retry options

An extended set of retry options is available in some languages.

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

For languages that support extended retry options, you can set the following options:

OptionTypeRequiredDefaultDescription
retryDelayJitternumber50The jitter to use in the retry delay
backOffFactornumber2The backoff factor to use for exponential backoff
maxDelaynumber5000The maximum delay in milliseconds between retries
httpCodesToRetryarray[408, 429, 500, 502, 503, 504]The HTTP codes to retry
httpMethodsToRetryarray["GET", "POST", "PUT", "DELETE", "PATCH", "HEAD", "OPTIONS"]The HTTP methods to retry

retryDelayJitter

The retryDelayJitter option sets the jitter to use in the retry delay. For example, if this is set to 50, then the SDK will vary the delay between retries by a random number between 0 and 50 milliseconds.

backOffFactor

The backOffFactor option sets the backoff factor to use for exponential backoff. For example, if this is set to 2, then the SDK will double the amount of time between retries on each retry.

maxDelay

The maxDelay option sets the maximum delay in milliseconds between retries. For example, if this is set to 5000, then the maximum delay between retries will capped at 5 seconds.

httpCodesToRetry

The httpCodesToRetry option delimits the response HTTP status codes on which the SDK should retry.

httpMethodsToRetry

The httpMethodsToRetry option delimits the HTTP methods on which the SDK should retry.

environmentVariables

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

The environmentVariables setting allows you to define environment variables that need to be set by the SDK user for the SDK to work - for example if you need values set that are used in code you create in a hook.

This setting is an array of objects, with each object having the following options:

OptionTypeRequiredDefaultDescription
namestringN/AThe name of the environment variable
descriptionstringN/AThe value of the environment variable

These environment variables will be declared in the .env.example files that are created with each SDK (assuming this is enabled with the generateEnv setting). They will also be documented in the README for the SDK.

For example, if you have the following:

{
...
"environmentVariables" : [
{
"name": "TEAM_NAME",
"description": "The team name for the SDK user"
}
],
...
}

This will add the following to the .env.example file:

TEAM_NAME=

And the following to the README:

## Environment Variables

You will need the following environment variables in order to access all the features of this SDK:

| Name | Description |
| :-------- | :----------------------------- |
| TEAM_NAME | The team name for the SDK user |

name

The name for the environment variable.

description

The description for the environment variable. This is used for the README file only.

refreshToken

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

The refreshToken setting is used to configure the refresh token functionality for the SDKs, to allow the SDK user to remain authenticated after their authentication expires. This is an object with the following options:

OptionTypeRequiredDefaultDescription
endpointstringN/AThe endpoint to use for refreshing the token
bearerKeystringN/AThe response property to use to get the bearer token from the response
refreshKeystringN/AThe response property to use to get the refresh token from the response

If your API supports refresh tokens for authentication, then this needs to be set. If this section is not set, then the SDKs will not have refresh token functionality enabled. You can read more about refresh tokens in our authentication guide.

These values need to match your spec - the endpoint needs to be defined as a supported path that can receive POST requests, and the bearerKey and refreshKey must be valid fields in the response from the endpoint.

endpoint

This is the endpoint to use to refresh the token.

bearerKey

The bearerKey is the name of the key in the response from the refresh token endpoint that contains the access token that the SDK can use to continue authenticating with the API.

For example, if this is the response from the endpoint that is defined in your API spec:

"RefreshTokenPair": {
"properties": {
"accessToken": {
"type": "string"
},
"refreshToken": {
"type": "string"
}
},
"required": [
"accessToken",
"refreshToken"
],
"type": "object"
},

Then the bearerKey should be set to accessToken:

{
"customizations": {
"refreshToken": {
...
"bearerKey": "accessToken"
}
}
}

refreshKey

The refreshKey is the name of the key in the response from the refresh token endpoint that contains the refresh token that the SDK can use to continue refreshing the access token with the API.

For example, if this is the response from the endpoint that is defined in your API spec:


"RefreshTokenPair": {
"properties": {
"accessToken": {
"type": "string"
},
"refreshToken": {
"type": "string"
}
},
"required": [
"accessToken",
"refreshToken"
],
"type": "object"
},

Then the refreshKey should be set to refreshToken:

{
"customizations": {
"refreshToken": {
...
"refreshKey": "refreshToken"
}
}
}

environments

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

Your API may have multiple environments or locations, such as preview and production, or NorthAmerica, EMEA, and APAC. This setting allows you to configure environments to be added to the SDKs as constant values that are passed in when creating the SDK client.

This is an array of objects, with each object having the following options:

OptionTypeRequiredDefaultDescription
namestringN/AThe name of the environment
urlstringN/AThe URL for the environment

You can read more about configuring URLs and setting these at run time in our URLs and environments guide.

name

The name option sets the name of the environment. This is used as the name of the constant in the SDK, and is used when creating the SDK client. This name must not have any invalid characters that would not be allowed in constant names. For example, DevNA is valid, Dev NA is not.

url

The url option sets the URL for the environment. This is used as the value of the constant in the SDK, and is used when creating the SDK client. This is validated to ensure it is a valid URL.

responseHeaders

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP
✅*
note

Response headers are always included in the Go SDKs by default.

When responses come back from API calls, they can contain data, as well as important information in the headers. By default, the SDKs will only return the data from the response, and ignore the headers. If you want to include the headers in the response, then set this option to true.

For example, if you have a response object like this:

paths:
/soda/{id}:
get:
operationId: getSoda
parameters:
- name: id
in: path
required: true
description: The id of the soda
schema:
type: string
responses:
'200':
description: Expected response to a valid request
content:
application/json:
schema:
$ref: '#/components/schemas/Soda'
components:
schemas:
Soda:
type: object
properties:
name:
type: string
id:
type: string

If the response headers option is not set, or set to false, then the generated getSoda method will look like this:

This feature is not currently supported with TypeScript v2 SDKs.

If you set the response headers option to true:

{
...
"customizations": {
"responseHeaders": true
},
...
}

This feature is not currently supported with TypeScript v2 SDKs.

devContainer

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

The devContainer option determines if the generated SDKs should include the files to be able to open and run the SDK using a dev container.

A dev container is a development environment setup that is containerized using technologies like Docker, making it consistent and reproducible across different development machines. It contains everything needed for the development environment, including the programming language, dependencies, libraries, tools and extensions.

If you set this to true, every SDK generated will include a devcontainer.json file, allowing you to start using the SDK as soon as it's produced from inside any IDE that supports development containers, such as VS Code. Additionally, each SDK will have a VS Code launch.json file so you can run and debug the SDK example.

{
...
"customizations": {
"devContainer": true
},
...
}

You can read more on development containers in the development containers documentation.

includeOptionalSnippetParameters

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

The includeOptionalSnippetParameters option determines if optional and deprecated parameters should be included in the code snippets in generated documentation or not.

If this is set to true (the default), then optional parameters will be included in the code snippets in the generated documentation. If this is set to false, then optional parameters will not be included in the code snippets in the generated documentation.

For example, if you have an endpoint with an optional parameter:

paths:
/llamas:
get:
operationId: getAllLlamas
description: Retrieve a list of all llamas
parameters:
- name: age
in: query
description: Age of the llamas to get
example: 5
required: false
schema:
type: integer

With this option set to true, the code snippets in the generated documentation will include the optional parameter:

const result = await sdk.llamas.getAllLlamas();

If this option is set to false, the code snippets in the generated documentation will not include the optional parameter:

const result = await sdk.llamas.getAllLlamas();

buildAllModels

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

The buildAllModels option determines if liblab should build all models, including the ones that are not returned by the SDK's services.

For example, if you set buildAllModels to true, then liblab will build the models that correspond to the errors that are returned by an API, such as the models for 4XX responses.

endpointCustomizations

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

The endpointCustomizations setting is used to customize various HTTP methods on API endpoints. This is an object with the following structure:

{
...
"customizations": {
"endpointCustomizations": {
"/pets": {
"get": { ... }
}
}
}
...
}

Supported HTTP methods:

getpostputdeletepatch

Each endpoint path and HTTP method combo that appears in your OpenAPI spec has the following customization options:

OptionTypeRequiredDefaultDescription
operationIdstringN/AA new operationId name

operationId

This customization allows you to override an existing or missing operationId for a specific endpoint path and HTTP method combination. For example, if your OpenAPI spec contains the following endpoint and you want to change its operationId:

{
...
"paths": {
"/pets": {
"get": {
"operationId": "123aBadOperationId",
}
...
}
...
}
...
}

You can override the existing operationId without directly altering your OpenAPI spec by using the operationId customization with a new name:

{
...
"customizations": {
"endpointCustomizations": {
"/pets": {
"get": {
"operationId": "getPets"
}
}
}
}
...
}

Now the final SDK will be generated with the customized operationId:

async getPets(params?: getPetsParams, requestConfig?: RequestConfig): Promise<HttpResponse<Pet[]>> {
...
}

streaming

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

This customization allows you to add streaming support for a specific endpoint path and HTTP method combination.

Adding streaming support means that the SDK will return one or more responses for a single HTTP call. This is useful when you have an endpoint that returns a stream of data, such as the tokens resulting from a call to a Large Language Model (AI model).

Automatic streaming support

Streaming support is automatically added for endpoints that return a text/event-stream content type.

To add streaming support for an endpoint that does not automatically support it, you can modify the customizations of the liblab.config.json file. This allows you to specify streaming behavior without changing the original OpenAPI spec.

If your OpenAPI spec contains the following endpoint and you want to add streaming support to it:

{
...
"paths": {
"/generate": {
"post": {
"operationId": "generate",
"requestBody": {
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/GenerateRequest"
}
}
}
},
"responses": {
"200": {
"description": "Successful response",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/GenerateResponse"
}
}
}
}
}
}
...
}
...
}
...
}

You can add streaming support using the streaming customization as follows:

{
...
"customizations": {
"endpointCustomizations": {
"/generate": {
"post": {
"streaming": "true"
}
}
}
}
...
}

This modification ensures that the SDK will support streaming for the specified endpoint and HTTP method combination without requiring changes to the original OpenAPI spec.

pagination

Pagination simplifies handling large datasets by managing paginated API responses automatically. It allows developers to efficiently retrieve and iterate through data page by page, eliminating the need for manual intervention. With liblab’s SDK handling pagination seamlessly, developers can focus on core functionality.

liblab provides two ways to configure pagination:

  1. Using the OpenAPI spec with the liblab's x-liblab-pagination annotation.
  2. Using the liblab.config.json file to customize the necessary endpoints.

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

x-liblab-pagination annotation

You can define pagination directly in the OpenAPI spec using the x-liblab-pagination annotation. This approach allows pagination to be integrated directly to the API structure, as shown in the following example:

petstore.json
"paths": {
  "/pets": {
    "get": {
      "operationId": "listPets",
      "x-liblab-pagination": {
        "paginationType": "offsetLimit",
        "inputFields": [
          { "name": "offset", "in": "query", "type": "offset" },
          { "name": "limit", "in": "query", "type": "limit" }
        ],
        "resultsArray": {
          "results": "$.pets"
        }
      }
    }
  }
}

The highlighted configuration automatically adds pagination parameters (offset and limit) and defines how the paginated data should be extracted from the API response. The following table describes the configuration code:

FieldTypeRequiredDescription
paginationTypestringSpecifies the pagination method used to convert the received data into paginated results. The following options are available:
     
  • "offsetLimit": The pagination will use offset and limit parameters to convert the received data into paginated data.
  •  
inputFieldsobject arrayDefines the pagination parameters sent in the API request.  
inputFields.namestringThe parameter's name as specified in your API. The pagination parameter names must match those used by the API running on your server. Otherwise, the SDK won't function properly, since the API running in your server will not identify the pagination settings you want to apply.
inputFields.instringSpecifies where in the API request the parameter is used. The following options are available:
  • "query": The pagination parameter and value will be sent in the URL query string.
  •  
inputFields.typestringDefines the purpose of the pagination parameter.  The following options are available:
  • "limit": The maximum number of items to return in the response.
  • "offset": The number of items to skip before starting to collect the result set.
  •  
resultsArrayobjectDefines where the paginated results are located in the API response.
resultsArray.resultsstringSpecifies the data location in the API response. The resultsArray.results property should point to the array containing the results (e.g., $.pets). If this is not correctly configured, errors may occur when using the SDK since the SDK expects the response to return an array.

In addition to the annotation, you must define the pagination parameters in the OpenAPI spec. The following code block presents the parameters definition for the same endpoint:

petstore.json
"paths": {
  "/pets": {
    "get": {
      "parameters": [
        {
          "name": "limit",
          "in": "query",
          "required": true,
          "schema": {
            "type": "integer",
            "format": "int32"
          }
        },
        {
          "name": "offset",
          "in": "query",
          "required": true,
          "schema": {
            "type": "integer",
            "format": "int32"
          }
        }
      ]
    }
  }
}

The following table describes the settings to configure the parameters:

FieldTypeRequiredDescription
namestringThe parameter's name. The informed name must match the names in the inputFields.
instringSpecifies where the parameter will be used when performing the API request.  
requiredboolDefines if the parameter is required when to perform the API request.
schemastringDefines the parameter structure, specifying how the parameter should be formatted and validated. For the pagination feature, both the limit and offset parameters are integers, with the format int32.
Set the parameters as required

When using the liblab pagination feature, you must set the parameters as required ("required": true).

Customizing pagination through liblab.config.json

When the OpenAPI spec is machine-generated or unavailable for modification, you can configure pagination through the liblab.config.json file. This allows you to store pagination settings separately from the spec, as shown in the following example:

{
  "customization": {
    "endpointCustomizations": {
      "/pets": {
        "get": {
          "pagination": {
            "paginationType": "limitOffset",
            "inputFields": [
              {
                "name": "limit",
                "in": "query",
                "type": "limit"
              },
              {
                "name": "offset",
                "in": "query",
                "type": "offset"
              }
            ],
            "resultsArray": {
              "results": "$.page",
              "defaultPageSize": 5
            }
          }
        }
      }
    }
  }
}

The fields here are similar to those in the x-liblab-pagination annotation, with an additional option to set a default page size (defaultPageSize). The defaultPageSize is used as the default value for limit if it isn't provided in the request. You must inform the defaultPageSize parameter when configuring the pagination features through liblab.config.json.

When using the liblab.config.json to configure the pagination feature, you still have to define the parameters in the OpenAPI spec. Otherwise, the SDK cannot generate accurate requests to the API. You should use the same settings to define the parameters as described before.

Paginated endpoints

Paginated endpoints are designed to handle large data sets by breaking them into smaller, manageable chunks called "pages." This approach improves performance and user experience by loading data incrementally rather than all at once. There are two common types of pagination methods:

  • Iterable pagination
  • Manual pagination
Pagination tutorial

Access the Build a TypeScript SDK with Pagination tutorial for detailed, step-by-step guidance on implementing and using the pagination feature.

liblab pagination feature enables you to use both of these options using a simple functions easily.

When you perform a request using liblab’s SDKs, the response returns an iterable object designed to simplify the pagination process. This object can be used directly in a for loop, allowing you to process each data page in sequence. As you loop through the results, the SDK automatically fetches the next page behind the scenes, eliminating the need to manage each request manually.

Each paginated response contains the usual metadata, which is helpful for debugging. The actual data for each page is located inside the data property, making it easy to retrieve and work with the results, while the SDK takes care of fetching additional pages as needed.

This approach is ideal for scenarios where you need to handle large datasets efficiently and want to process all available data without worrying about manually fetching each page.

The following code block presents an example of using the iterable pagination approach considering a TypeScript-generated SDK with a pagination feature available. An example of a paginated response is also available.

index.TypeScript
  import { TypeScriptSdk } from 'typescript-sdk';

(async () => {
const typescriptSDK = new TypeScriptSdk({
token: 'YOUR_TOKEN',
});

const pages = await typescriptSDK.petstore.petsList({
limit: 2,
offset: 5,
});

for await (const page of pages) {
console.log(page.data);
}
})();

The response tab presents the results from the data request in a paginated format. Each page had 2 elements, defined by the limit, and the data started from element id = 5, since offset = 5.

readme

Supported SDK languages and versions:

TypeScriptJavaPythonC#GoPHP

The readme option allow you to override the API description from your OpenAPI spec when generating the SDKs ReadMe file. The readme section is an object with the following options:

OptionTypeRequiredDefaultDescription
apiDescriptionstringN/ACustom text used to replace the default description in the ReadMe file.

apiDescription

The apiDescription key allows you to override the default description in the SDK's ReadMe file generated by liblab. Below are the available options within this object:

Here’s an example of how to override the description in the generated ReadMe file:

liblab.config.json
{
...
"customizations": {
"readme": {
"apiDescription": "Custom readme description text"
},
}
...
}