Client library
A client library is reusable software that provides programmatic interfaces for an application to interact with a service, platform, or system.
Amazon Web Services in Action, Third Edition: An in-depth guide to AWS
A software development kit is a collection of programming libraries and supporting tools for building applications that use a particular platform or service.
- How it is used
- Integrates AWS services into application code and supports programmatic infrastructure control.
- How deep it goes
- Works through client setup, parameter objects, service calls, and error handling, while leaving HTTP authentication and serialization to the SDK.
- Examples
- Uses Node.js applications that list EC2 instances, upload S3 images, add DynamoDB users, and send SQS messages.
- What you can do after
- Build it from scratch with the AWS SDK for Node.js to call services and handle errors in an application.
Automating API Delivery
A client library is a software library that provides programmatic calls and client-side code for interacting with an API.
- How it is used
- Gives API consumers language-specific calls while keeping generated client code aligned with the API definition and reference.
- How deep it goes
- Shows Java SDK generation, client configuration, and a demonstration test, then addresses pipeline storage and maintenance rather than HTTP-client internals.
- Examples
- Uses a generated Java Product Catalog client with an OkHttp-based option and a test that calls viewProduct and prints its response.
- What you can do after
- Build it from scratch with OpenAPI Generator CLI, configure a generated client call, and plan how to store and maintain SDK packages.
Platform Engineering on Kubernetes
A client library is a software library that provides application code with programmatic access to an external service or system.
- How it is used
- Provides application code with language-specific access to cloud services, Dapr APIs, or a pipeline engine without manually assembling every request.
- How deep it goes
- Explains dependency and coupling trade-offs, then shows a Go client in pipeline code; stops short of implementing an SDK.
- Examples
- Uses Dapr statestore requests, a Go Dagger pipeline client, and a service that bypasses platform APIs through a database client.
- What you can do after
- Evaluate/understand when an SDK saves request-writing effort and when its provider or database dependency creates unacceptable coupling.
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Starting Data Analytics with Generative AI and Python
A collection of programming tools, libraries, documentation, and other resources for building applications against a software platform or service.
- How it is used
- Uses prebuilt programming interfaces to connect analytics applications with generative AI services.
- How deep it goes
- Demonstrates client setup, requests, responses, provider selection, and configuration while deferring library internals.
- Examples
- Shows Python calls to ChatGPT, Llama through a changed base URL, and Vertex AI with model and safety settings.
- What you can do after
- Build applications that send programmatic requests to generative AI services using a supported client library.
Read how Starting Data Analytics with Generative AI and Python explains client library →
Terraform in Depth: Infrastructure as Code with Terraform and OpenTofu
A client library is a software library that provides programmatic interfaces for invoking and interacting with another system.
- How it is used
- Drives Terraform or OpenTofu commands from Python while centralizing execution settings and result processing.
- How deep it goes
- Explains initialization, subprocess execution, structured results, and version checks, but stops short of a complete command API.
- Examples
- Uses a Tofu initializer, a configured Terraform workspace, command results, and JSON or JSONL parsing helpers.
- What you can do after
- Build a Python wrapper that configures, runs, parses, and diagnoses Terraform or OpenTofu commands.
Related concepts
- RESTuses · REST is an architectural style for distributed hypermedia systems that organizes interactions around resources and representations through constraints including a uniform interface, stateless communication, cacheability, and layered components.
- contractuses · An API contract is a specification of the operations, data, and behavioral expectations that govern interactions between software components.
- OpenAPI Generatorproduced by · OpenAPI Generator is a code-generation tool that creates client libraries, server stubs, and related artifacts from OpenAPI documents.
- Vertex AI SDKpart of · The Vertex AI SDK is a software development kit that provides programmatic access to Vertex AI services from supported applications.
- serviceuses · A service is a software or computing capability that provides defined functionality to users or other components through an interaction boundary.
- interopused by · Java interoperability is the ability of code in another language or runtime to access and work with Java code, types, libraries, and functionality.
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