OpenAPI Generator Review (2023): Best Way to Automate Your API Code Generation

Updated on January 1, 2023  |  Info Post 

Open API Generator Review

If you’re looking for a way to automate your API code generation, you’ll want to check out OpenAPI Generator. In this OpenAPI Generator review, we’ll look at what is it, and how it works and whether or not it’s the right tool for you. So let’s get started!

OpenAPI Code Generator Overview

Open API Code Generator Overview

OpenAPI Generator is a powerful tool for quickly generating high-quality API code based on a user-defined specification. By specifying the various functions, parameters, and data types used in an API, users can easily generate the necessary code to implement that API elsewhere.

This enables developers to quickly build robust APIs while saving time and reducing manual coding errors. In addition, OpenAPI Generator offers a wide range of customization options and functionalities, allowing users to fine-tune their API generation process according to their needs.

It aimed to reduce developers’ burden by integrating and leveraging OpenAPI documents. With this tool, you can automatically generate an API specification based on your existing application code.

OpenAPI Generator can generate client libraries for various programming languages, making it possible to quickly develop intuitive and robust API clients without much extra work.

Whether you’re creating an API from scratch or reworking existing code, OpenAPI Generator is a convenient and powerful tool that can help you to achieve your goals.

Key Features

Intuitive Interface

Key Features - Intuitive Interface

OpenAPI Generator is a powerful yet easy-to-use tool that helps developers create accurate, detailed API specifications quickly and easily. One of its standout features is its intuitive interface, which makes it simple to get up and run with minimal fuss.

This feature makes it easy for developers of all backgrounds and experience levels to create powerful and accurate OpenAPI documents in minutes.

Robust Customization Option

Key Features - Robust Customization Option

This powerful tool makes creating custom requests and responses for your API easy. Its robust customization options allow you to easily customize almost every aspect of the requests and responses, from the elements within them to the formatting and styling of individual fields.

Automated Code Generation

Key Features - Automated Code Generation

The automated code generation tool helps to reduce the time and effort involved in creating server apps from scratch. This feature simplifies common programming tasks, such as connecting database resources to code, and automates tedious steps like generating code for endpoints and models.

In addition, OpenAPI Generator has many other useful tools that help developers streamline their development process, including templates for common scenarios like database resource CRUD, authentication, file management, and more.

Open-source Code Generation

Key Features - Open-source Code Generation

Its powerful code generation capabilities allow developers to quickly create a wide variety of code, including Java classes, client code libraries, and even interfaces for web applications. OpenAPI Generator allows users to customize their generated code based on the needs of their project or application.

Custom Validation Rules

Key Features - Custom Validation Rules

Custom validation rules are a way to check that the code generated by OpenAPI Generator is correct and conforms to your standards. The custom validator checks to ensure that the parameters passed to an API call match the types defined in the codebase. If there is a mismatch, the code will generate an inline type for the call, which is not accessible to developers.

Support Multiple Languages

Key Features - Support Multiple Languages

OpenAPI Generator is a versatile tool that supports multiple programming languages and platforms. With support for multiple languages, including JavaScript, Ruby, Python, and Swift, and an intuitive user interface, OpenAPI Generator makes it simple to configure complex APIs with minimal effort rapidly.

Custom templates

Key Features - Custom templates

This unique feature allows you to easily create your own custom OpenAPI specification templates that reflect your specific needs and requirements.

With customizable templates, you can ensure that your OpenAPI specs are tailored precisely to your specifications.

For example, you might want to include certain validation rules specific to your company’s data, or maybe you need a set of predefined response codes for different scenarios.

Whatever your needs may be, the custom templates feature of OpenAPI Generator can help you tailor a dynamic and flexible specification that meets those needs.

Support many integrations

Key Features - Support many integrations

This platform supports many integration options, including database abstraction layers and message queuing systems.

Whether you need to interface with MySQL, PostgreSQL, MongoDB, Redis, or any other data store, you can easily integrate your code with these databases through the OpenAPI Generator.

Additionally, if you need to process asynchronous messages via Kafka or RabbitMQ, this tool also provides built-in support for these systems.

Custom generators

Key Features - Custom generators

With this tool, you can select exactly the features, fields, tags, and language that you want for your API, ensuring that you get everything you need in a way that is tailored to your project or application.

In addition, OpenAPI Generator also allows you to use complex user input easily and intuitively. Whether generating models with custom data structures or dealing with nested APIs, OpenAPI Generator makes it simple to create flawless code and maintain standards across multiple projects.

Workflow Integration

Key Features - Workflow Integration

The workflow integration feature allows users to incorporate API specifications into their development workflows easily.

This makes it easier to create new APIs in a structured and consistent manner and allows developers to make changes and updates directly in their code without entering the metadata editor.

OpenAPI Generator’s workflow integration feature also supports several popular IDEs, such as Visual Studio Code or Eclipse, helping developers streamline their API creation process from start to finish.

User Experience

User Experience

The user experience of customers who use OpenAPI Generator is an important consideration when evaluating this tool.

After all, the goal of OpenAPI Generator is to allow developers to create and update API specifications quickly and efficiently easily.

While the interface for this tool is streamlined and easy to use, it requires a certain level of familiarity with software development concepts and practices to use it effectively.

For example, users must understand basic API terminology and how to modify code snippets to customize these specifications according to their needs. While there may be a small learning curve when using OpenAPI Generator, users are ultimately rewarded with a robust suite of tools to help them create better APIs faster.



OpenAPI Generator is highly versatile and can be configured to suit many use cases, from simple one-off illustrations to full automatic code generation for backend services. What’s more, the OpenAPI Generator is community supported, with contributions from developers worldwide.

Overall, the support for OpenAPI Generator is excellent. Many resources are available online to help users get started with the tool and troubleshoot any issues that might arise.

Community forums are always buzzing with activity, with users sharing tips and tricks and discussing best practices and new features. Their team provides frequent updates with bug fixes and exciting new features.

What I Like (Pros)

Powerful Debugging Feature

Designed to make API testing and development easier, this feature allows you to quickly debug your APIs by automatically locating potential errors.

This helps you to quickly identify any issues with your code, saving you time and headaches down the line.

Additionally, by streamlining the API development process, OpenAPI Generator can help you save time and money in the long run.

Ease of Use

Unlike many other API development tools, OpenAPI Generator is incredibly simple to set up and start with. This is thanks largely to its intuitive interface, which makes it a breeze for even novice developers to start crafting powerful, custom APIs with just a few clicks.

OpenAPI Generator provides all the functionality needed to quickly and efficiently create high-quality APIs that meet even the most demanding requirements.

Whether you’re developing an API from scratch or updating an existing one, OpenAPI Generator will surely be your perfect partner on the journey.

What I Dislike (Cons)

Lack of Security:

As with any open API generator, security is one of the main concerns. Open API generators often handle a large amount of sensitive data, increasing the risk of a breach.

Data can be vulnerable to hackers, who might attempt to steal or manipulate customer information or even customer funds. Some open API generators are prone to downtime and other errors, exposing companies to malicious attacks if data is not properly backed up.

Lack of Control:

Another major concern with open API generators is their lack of control over the tools.

Since these tools are freely available online, companies have limited options for maintaining and updating them, making it difficult to customize their functionality or tweak existing features.

This can lead to unwanted complexity in overall backend infrastructure and operations, ultimately slowing development time and adding unnecessary costs.

Lack of Compatibility:

One of the biggest concerns related to OpenAPI Generator is its lack of universal compatibility. Because the tool uses machine learning and human input to generate APIs automatically, there will likely be occasional glitches or errors in the code.

Additionally, OpenAPI Generator relies on certain specifications for different programming languages, which may not always provide straightforward results.

While these issues can be problematic for some users, they do not make OpenAPI Generator any less valuable or effective overall. Its flexibility and ease of use make it an indispensable component of modern web development workflows.


You can install Open API Generator for free.


What is API Documentation?

API documentation is a set of written instructions that explain how to interact with an application programming interface or API. These instructions typically include parameters, data formats, and return values for different methods within the API.

To develop software that communicates successfully with an API, it is crucial to have accurate and up-to-date documentation.

Otherwise, developers may make mistakes when interacting with the API or be unable to implement specific features into their applications easily. Good API documentation is essential for creating well-functioning software programs.

What is API Code Generation?

API code generation is a process by which software developers can automatically produce code for various API components such as functions, classes, and objects.

This process can save developers time and effort by enabling them to create API functionality from predefined templates or descriptions quickly.

Furthermore, API code generation is often more reliable than manual coding because it incorporates more rigorous testing procedures. This approach to API development has become increasingly popular in recent years and is widely regarded as a key component of effective programming practices.

How does the OpenAPI Generator differ from other API specification tools?

The OpenAPI Generator is different from the other best API tools because it allows for the generation of API client libraries, server stubs, and documentation from an OpenAPI Specification.

OpenAPI Generator is easy to use and reduces the burden on new development and technologies. It is community-driven and has a strong ethos of simplicity and collaboration.

How does OpenAPI Generator work?

OpenAPI Generator creates API documentation from an OpenAPI Specification by automating the process of creating API documentation. It uses a specification to generate API documentation and can generate code for any language. This makes documenting an API easier by automating the process of creating API documentation from an OpenAPI Specification.

What is an alternative to OpenAPI Generator?

One popular alternative to OpenAPI Generator is Swagger Codegen. This powerful tool supports a wide range of programming languages and SDKs, making it a great choice for developers who need to build API functionality into their applications quickly.

Swagger Codegen offers many advanced features not available in OpenAPI Generator, including the automatic generation of rich documentation, powerful testing capabilities, and intuitive code validation. If you are looking for an alternative, efficient and flexible platform for creating API-driven applications, then Swagger Codegen is worth considering.


If you’re looking for a reliable and easy-to-use API creation tool, you should consider Open API Generator. This powerful software provides everything you need to quickly and easily create polished, professional API code that complies with all the latest industry standards.

And thanks to its intuitive and user-friendly interface, anyone can use this powerful tool effectively. Whether you are a developer or an administrator looking to speed up development times and improve API quality, the Open API Generator is the best way to automate your API code generation needs. It’s a great product that saves you time and effort.

About the Author

Nick Patrocky writes SaaS and Business Software reviews. He's also the head of design at a rapidly growing fintech company. Nick's worked with hundreds of software companies and startups over the last 10 years. Reach out if you have any questions or if you'd like to collab.