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What are RESTful APIs?
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What is OAuth?
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What is JWT?
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What are API keys?
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How to combine them?
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Here’s what else to consider
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How do you design RESTful APIs with OAuth, JWT, and API keys? This is a common question for software developers who want to build secure and scalable web services. In this article, you will learn the basics of these three concepts and how they can help you create robust and user-friendly APIs.
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1 What are RESTful APIs?
RESTful APIs are web services that follow the REST (Representational State Transfer) architectural style, which consists of principles and constraints that define how clients and servers should interact. These APIs use HTTP methods (GET, POST, PUT, DELETE, etc.) to perform operations on resources, uniform resource identifiers (URIs) to identify and access resources, and standard formats (such as JSON or XML) to exchange data between clients and servers. Additionally, they are stateless, meaning that each request contains all the necessary information to process it and the server does not store any client-specific data. Ultimately, RESTful APIs attempt to provide a straightforward, consistent, and adaptable way of interacting with web services, regardless of the underlying technologies or platforms.
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2 What is OAuth?
OAuth is an open standard for authorization that enables clients to access resources on behalf of users, without sharing their credentials. It works by using tokens, which are strings of characters that grant specific permissions and expire after a certain time. The process starts when the user requests access to a resource from a client. The client then redirects the user to the authorization server, where the user authenticates and grants consent. The authorization server then issues an access token and optionally a refresh token to the client. The client uses the access token to request the resource from the resource server, which validates it and returns the resource. If needed, the client can use the refresh token to obtain a new access token when the old one expires. OAuth allows users to control what data and actions they share with third-party clients, while providing a secure and standardized way of delegating authorization.
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3 What is JWT?
JWT (JSON Web Token) is an efficient and self-contained way of transmitting information between parties as a JSON object. It is composed of three parts: a header containing metadata about the token, a payload containing claims about the subject and issuer, and a signature that verifies the integrity of the token. The issuer generates the JWT with these three parts, encodes it using base64url encoding, and sends it to the recipient. The recipient then decodes the JWT and verifies the signature with the issuer's public key or secret. From there, they can read the claims from the payload and use them for authentication, authorization, or data exchange. The benefit of JWT is that it allows parties to securely exchange information without having to rely on a central authority or database.
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4 What are API keys?
API keys are unique identifiers used to authenticate and authorize clients to access web services. They are typically generated by the service provider and assigned to the client, with different scopes and roles based on the level of access and functionality needed. The process works like this: the client requests an API key from the service provider, either through a web interface or an API call, and the service provider generates and returns an API key with associated permissions and expiration date. The client then stores the API key securely and uses it to make requests to the web service, which validates the API key and checks the permissions and expiration date before processing the request. API keys allow service providers to monitor and control usage and performance of their web services, while providing a simple and fast way of authenticating and authorizing clients.
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5 How to combine them?
RESTful APIs, OAuth, JWT, and API keys are not mutually exclusive and can be used together to design secure and scalable web services. For example, OAuth can delegate authorization to third-party clients, while JWT can be used as the access token format. Additionally, JWT can be used for authentication and authorization within a web service, while API keys can be used for external clients. Alternatively, API keys can be used for authentication and authorization, while JWT can be used for data exchange. Ultimately, there is no one-size-fits-all solution when designing RESTful APIs with OAuth, JWT, and API keys. It is important to consider your specific requirements and use cases in order to choose the best combination of techniques that suits your needs.
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6 Here’s what else to consider
This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?
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