Step 4: Enter the Project name, and then click Create. Step 3: Select ASP.NET Core Web Application template. Step 1: Go to File -> New, and then select Project. Create an ASP.NET Core REST API applicationįollow these steps to create an ASP.NET Core application in Visual Studio 2019: The following section explains how to create a REST API and secure it using a token. (In the middle, if claims are alerted, they will generate a different signature, hence resource access will be restricted.)ĭon’t share confidential information using a JWT, since a JWT can be decoded and the claims or data it possesses can be viewed. If the signatures are different, an unauthorized response will be sent back to the client.If the signatures are the same, the tokens are valid (not altered in the middle) and they provide access to the requested resource.Check whether both newly created signature and signature received from token are valid.Create signature of received header and payload using the same secret key used when creating the token.Split the header, payload, and signature from token. ![]() Read the token from authentication header.Step 4: Resource server verifies the token Step 3: Client sends token to resource serverįor each request to Resource or the API server, the client needs to include a token in the header and request the resource using its URI. If it is found valid, a token will be created (as explained previously) with the necessary claims, and a JWT token will be sent back to the client. The authentication server receives the token request and verifies the identity. The client sends a request to the authentication server with the necessary information to prove its identity. Please find the token workflow in the following. Signature: created by signing (encoded header + encoded payload) using a secret key. Payload: encoded data of claims intended to share. Header: encoded data of token type and the algorithm used to sign the data. JWT consists of the following three parts: A JWT helps the resource server verify the token data using the same secret key, so that you can trust the data. It is open standard and defines a better way for transferring data securely between two entities (client and server).Ī JWT is digitally signed using a secret key by a token provider or authentication server. ![]() In the previous section, we saw what a REST API is, and here we will see what a JWT bearer token is, which secures the REST APIs. Customer data based on application need.ĭata format: JSON is a common format to send and receive data through REST APIs.Type of encryption supported by client.Type of data being sent to server (JSON, XML).HTTP header: An HTTP header is a key-value pair used to share additional information between a client and server, such as: Operations we perform on the resource should follow this. HTTP method: HTTP method is the type of request a client sends to a server. Resource: Resources are uniquely identifiable entities (for example: data from a database, images, or any data).Įndpoint: A resource can be accessed through a URL identifier. REST APIs are HTTP-based and provide applications the ability to communicate using lightweight JSON format. ![]() REST stands for representational state transfer. What is a REST API?ĭue to the increasing number of different varieties of clients (mobile apps, browser-based SPAs, desktop apps, IOT apps, etc.), we need better ways for transferring data from servers to clients, independent of technology and server stacks. Note: In this demo application, I have used ASP.NET Core 3.1, Entity Framework Core 3.1 with Visual Studio 2019 16.4.0, SQL Server 2017, and Postman.
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