As we know the JWT contains three sections. Github:auth0/node-jsonwebtoken Understanding the JWKīefore we go forward with a complete example let’s quickly make sure that we understand the theory behind verifying the signature of a JWT. There are libraries that exist just for this purpose, and because we are using Node as our environment we need to find a node library. Next we need to decode the tokens to get the information inside, and then verify the signature of the tokens to ensure they are legitimate. Also, we wanted to provide more, so we added support for promises (hence async functions too).Previously we have covered the process of retrieving JWT Tokens from the Cognito Token Endpoint. Here’s sample code that signs a payload, prints the token and then verifies the token.Ĭopy to Clipboard const fastify = require('fastify')Ĭonst fastifyJwt = require('fastify-jwt')Ĭonst readFileSync = require('fs').readFileSyncĬonst privateKey = readFileSync(`$)Ĭonst decoded = verify(( || '').replace('Bearer ', ''))Īs the principle of fast-jwt is to provide and support the same features as jsonwebtoken, all operations needed to support callbacks. It is popular because it is very easy to use and is RFC compliant. The most popular npm package for signing, decoding and verifying JWTs is jsonwebtoken. As the only data transferred is a URL-safe string, it is compatible with most network protocols.It’s easy to implement, with many existing libraries in multiple languages.It is an open standard, described in IETF RFC 7519.Internet technologies are increasing their use of JWT for the following reasons: Signature: the cryptographic signature of the header and the payload, created using a well-known private key or secret and the algorithm defined in the header.There is a reserved set of claims (for example, sub, aud and iss) but the standard allows user-defined claims. Payload: contains one or more claims, which store the information in the token.For example, the algorithm used in the signature or the format of the payload. Header: contains information about the token.Pc3MiOiJXb3JsZCJ9.RE8d5ZGqC4t5KGif86oZ3K_iXy0A01W76dL1vsZgteMĮach token consists of the following three dot-separated sections: Each JWT is cryptographically signed so that the receiving party can validate the integrity and validity of the claims.Ĭopy to Clipboard eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJIZWxsbyEiLCJ What is a JWT?Ī JWT is a compact and URL-safe token that contains a payload, consisting of one or more claims. This blog post also outlines the architecture of fast-jwt, which includes caching and asynchronous support. Using flamegraphs, we compared fast-jwt on a sample Fastify server with the existing jsonwebtoken implementation. We created a new plugin, fast-jwt, to demonstrate and measure the Node.js performance improvements. Keep reading to discover how we improved the performance of JSON Web Tokens (JWT), one of the most common authentication systems, in Node.js. High performance and availability must be maintained without compromising the security of the system. Every day, individuals around the world use and send personal and sensitive information to an increasing number of remote services and every day, those services receive an increasing volume of traffic.Įach operation, even the smallest one, counts towards the performance and availability of a service.
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