![]() ![]() ![]() This improves the performance of repeated validation of data against a schema. Under the hood, Ajv compiles our JSON schemas into JavaScript code. Because JSON Schema is cross-platform, even if we decide to rewrite our applications in another framework or language, we can take our schemas with us. Once we’ve learnt the fundamentals of JSON Schema, we can use it everywhere. We’re not locked in to a library, framework or language. The JSON Schema specification is cross-platform, and there are validation libraries available for every popular programming language. When we combine JSON Schema and Ajv, we have a flexible solution for implementing validation in our Node.js applications: Some Node.js frameworks even provide JSON Schema based validation with Ajv built in. Launch Postman and send a GET request to the endpoint localhost:3000/api/users without authentication.We can use Ajv as a standalone library or we can integrate it with the framework we’re using to build our Node.js application. Go ahead and test the application to see if it works as it should. post ( "/api/login", async ( req, res ) => ) Test Your Node.js Application Now let's create a project folder and a new Node.js project by running the commands below. Prior knowledge of Node.js and Javascript.Pre-requisitesīefore you get started, ensure you have met the following requirements. Furthermore, because the signature is calculated using the header and payload, you can be certain that the content has not been tampered with. Information Exchange: JSON Web Tokens are an excellent way to securely transmit data between parties.īecause JWTs can be signed (for example, with public/private key pairs), you can be confident that the senders are who they claim to be. This allows a user to access routes, services, and resources permitted with that token. For each logged-in user, a JWT token is sent along with other subsequent requests. JWTs enable businesses to protect or restrict access to a portion of an application for a select group of users. ![]() Here are a couple of scenarios where JSON Web Tokens can be useful to your web application:Īuthorization: The most common use of JWTs in most business applications. Signature: Made up of an encoded header, an encoded payload, a secret, and an algorithm.Payload: Assertions about an entity and supporting data, known as claims. ![]()
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