Lob.com SDKs & Libraries: Official & Community Tools (2026)

SDKs overview

Lob.com provides Software Development Kits (SDKs) and client libraries designed to facilitate integration with its application programming interfaces (APIs). These SDKs abstract much of the complexity of direct API interaction, handling aspects such as HTTP requests, response parsing, and authentication. Developers can use these tools to programmatically access Lob.com's core services, including Address Verification API and Print & Mail API, from within their preferred programming environments. The availability of SDKs across multiple languages aims to reduce implementation time and potential error rates by providing pre-built functions and data structures tailored to the specific API operations.

The SDKs are maintained by Lob.com and are supported with documentation that includes installation instructions, method references, and code examples. This approach aligns with common industry practices for API providers, where SDKs serve as official client wrappers for their services, as seen with platforms like Stripe's SDKs for payment processing or Twilio's Helper Libraries for communication services. A sandbox environment is provided for developers to test integrations without incurring costs, allowing for iterative development and debugging.

Official SDKs by language

Lob.com offers official SDKs for several programming languages, each designed to provide a native-like experience for developers. These libraries encapsulate the functionality of the Lob.com API, allowing developers to interact with services like address validation, postcard creation, and letter printing using idiomatic language constructs.

Each SDK is maintained by Lob.com and is regularly updated to reflect changes and additions to the underlying API. Comprehensive documentation for each SDK, including API reference materials and usage examples, is available on the Lob.com SDKs page.

Installation

Installing Lob.com's official SDKs typically involves using the standard package manager for the respective programming language. Each SDK is distributed through its ecosystem's established channels, ensuring consistency with other library installations.

Python Installation

For Python developers, the Lob.com SDK is available via PyPI, the Python Package Index. Installation is performed using the pip command-line tool.

pip install lob-python

Node.js Installation

Node.js developers can install the Lob.com SDK from the npm registry, the default package manager for JavaScript.

npm install lob

PHP Installation

PHP projects typically use Composer for dependency management. The Lob.com PHP SDK can be installed by adding it to your project's composer.json file or via the command line.

composer require lob/lob-php

Ruby Installation

Ruby programmers can install the Lob.com Ruby SDK using RubyGems, Ruby's package manager.

gem install lob-ruby

Java Installation

For Java projects, the Lob.com SDK is distributed through Maven Central. Developers using Maven or Gradle can add the appropriate dependency to their project's build file.

Maven

Add the following to your pom.xml:

<dependency>
    <groupId>com.lob</groupId>
    <artifactId>lob-java</artifactId>
    <version>LATEST_VERSION</version> <!-- Replace LATEST_VERSION with the current version -->
</dependency>

Gradle

Add the following to your build.gradle:

implementation 'com.lob:lob-java:LATEST_VERSION' // Replace LATEST_VERSION with the current version

Always refer to the official Lob Java SDK documentation for the latest version numbers and detailed instructions.

Quickstart example

This quickstart example demonstrates how to use the Lob.com Python SDK to validate a mailing address. This fundamental operation is a common starting point for integrating with Lob.com's services. Before running, ensure you have installed the lob-python SDK and have your Lob.com API key available.

Python Address Validation

This Python snippet initializes the Lob.com client with your API key and then calls the address verification endpoint. Replace "YOUR_LOB_API_KEY" with your actual test or live API key from your Lob.com dashboard.

import lob

# Set your Lob.com API Key
lob.api_key = "YOUR_LOB_API_KEY"

try:
    # Validate an address
    address_to_validate = {
        "address_line1": "210 King St",
        "address_city": "San Francisco",
        "address_state": "CA",
        "address_zip": "94107"
    }
    
    validated_address = lob.us_verifications.verify(**address_to_validate)
    
    print("Address Validation Successful:")
    print(f"Primary Line: {validated_address.primary_line_valid}")
    print(f"Secondary Line: {validated_address.secondary_line_valid}")
    print(f"Deliverability: {validated_address.deliverability}")
    print(f"Components: {validated_address.components}")
    print(f"Suggested Address: {validated_address.deliverability_analysis.dpv_confirmation}")

except lob.api_errors.ApiException as e:
    print(f"Error during address validation: {e.status} - {e.reason}")
    print(f"Error details: {e.body}")
except Exception as e:
    print(f"An unexpected error occurred: {e}")

This code attempts to verify an address using the us_verifications.verify method. It then prints key details from the validation response, such as deliverability and component breakdown. Error handling is included to catch API-specific exceptions and general programming errors. Further details on address properties and verification outcomes are available in the Lob.com US Verifications API documentation.

Community libraries

While Lob.com provides a suite of official SDKs for widely used programming languages, the open-source nature of API development often leads to the creation of community-maintained libraries and tools. These unofficial libraries can emerge to support niche languages, frameworks, or specific use cases not directly covered by the official offerings. Community contributions might also offer different architectural approaches, performance optimizations, or additional utility functions.

When considering community libraries, it is important to evaluate their maintenance status, documentation quality, and compatibility with the latest API versions. Unlike official SDKs, community projects may not receive the same level of support or timely updates, which could lead to compatibility issues with new API features or changes. Developers are encouraged to check the project's repository (e.g., on GitHub), issue trackers, and community forums to assess its activity and reliability. For critical applications, prioritizing official SDKs generally ensures better stability, support, and adherence to API specifications. For a list of officially supported SDKs and client libraries, refer to the Lob.com SDK list.