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What is Bearer Token? A complete explanation of its details! There are many API authentication methods over HTTP. Bearer Token is one of the most commonly used. In this article, Bearer Token will be fully explained to you.
There are many API authentication methods over HTTP, such as Basic Authentication and Digest Authentication. Among them, Bearer Token is one of the most commonly used. In the following sections, we will delve into a comprehensive exploration of the definition, features, and usage of Bearer Tokens.
Bearer Authorization is an HTTP authentication scheme commonly used with OAuth 2.0. In this approach, the client includes an access token in the "Authorization" header using the "Bearer" scheme, granting permission to access protected resources. The server validates the token for authorization. It's a widely used method for securing API access, especially in scenarios involving third-party applications.
A Bearer token is a type of token used for authentication and authorization and is used in web applications and APIs to hold user credentials and indicate authorization for requests and access.
Generating Bearer tokens based on protocols and specifications such as OAuth and JWT (JSON Web Token). The authenticated user obtains the Bearer token issued by the server and sends it to the server in the header of the request. The server verifies the received bearer token and controls user access based on the token. The Bearer token is also usually sent over an encrypted connection via HTTPS. This prevents unauthorized access by malicious third parties even if the token is stolen.
Bearer tokens are generally composed of a random string of characters. Formally, it takes the form of the "Bearer" keyword and the token value separated by spaces. The following is the general form of a Bearer token:
Bearer {token_value}
Here is an example of an actual Bearer token:
Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6Ikpva
API keys and Bearer tokens are both mechanisms used to authenticate and authorize access to APIs, but they have key differences in their implementation and use:
| Aspect | API Key | Bearer Token |
|---|---|---|
| Format | Alphanumeric string | Alphanumeric string (may be more complex with additional info) |
| Usage | Passed as a query parameter or in headers | Included in the Authorization header using "Bearer" scheme |
| Scope | Typically tied to account/project, predefined access | Versatile, supports fine-grained access control, OAuth 2.0 usage |
| Security | Simple to use, but may be less secure if mishandled | Generally considered more secure, supports token expiration |
API keys are primarily used for authorization. They grant access to specific endpoints or actions within an API. When an API key is provided, it allows the client to perform certain authorized operations based on the permissions associated with that key.
On the other hand, Bearer Tokens are employed for authentication purposes. These tokens authenticate the client and provide access to API resources. Once a client is authenticated using a Bearer Token, it gains permission to interact with the API's resources.
Bearer tokens are typically used as temporary access tokens. The token has a validity period, and when it expires, the user must re-authenticate.
The validity period of a Bearer token is determined by the authentication protocol and server implementation. It can be expressed in absolute time (e.g., 30 minutes from issuance) or relative time (e.g., 24 hours from issuance).
A shorter expiration enhances security but may impact user experience. Setting an appropriate validity period is crucial for security. When sending requests with Bearer tokens, how to pass the token depends on the specific web service or API being accessed.
Next, we will show you how does Bearer Token works and use Apidog, a sophisticated API management tool, to authenticate the Bearer Token, send the request, and get the response.
The Authentication server creates Bearer Tokens upon user authentication for your application. These tokens, the main access type in OAuth 2.0, essentially mean "Grant access to the bearer of this token."
Bearer Tokens, structured values from the authentication server, are not random and depend on both user and client information.
To access an API, you use an Access Token, which has a short lifespan (around an hour). To get a new Access Token, submit the bearer token and your client ID to the Authentication server. This ensures the bearer token matches the application it was created for.
When unit testing an API in Apidog, the Bearer Token authentication method is very simple.
Open an existing API in Apidog, switch to "Debug" mode, select "Request" > "Auth", specify the type as "Bearer Token", and enter the Token in the input box at the bottom to submit.
It's important to note that bearer tokens should be kept secure and not shared unnecessarily. They should also be periodically rotated or revoked as required for security purposes.
Bearer tokens have advantages and disadvantages in the context of authentication and authorization.
