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The csrf npm package is used to generate and validate CSRF (Cross-Site Request Forgery) tokens to protect web applications from CSRF attacks. It is commonly used in conjunction with web frameworks like Express to ensure that requests made to the server are legitimate and not forged by malicious actors.
Generate CSRF Token
This feature allows you to generate a CSRF token. First, you create a new instance of the csrf class, then generate a secret, and finally create a token using that secret.
const csrf = require('csrf');
const tokens = new csrf();
const secret = tokens.secretSync();
const token = tokens.create(secret);
console.log('CSRF Token:', token);
Validate CSRF Token
This feature allows you to validate a CSRF token. You generate a secret and a token, and then use the verify method to check if the token is valid.
const csrf = require('csrf');
const tokens = new csrf();
const secret = tokens.secretSync();
const token = tokens.create(secret);
const isValid = tokens.verify(secret, token);
console.log('Is the token valid?', isValid);
The csurf package is another middleware for CSRF token creation and validation, specifically designed to work with Express.js. It provides similar functionality to csrf but is more tightly integrated with Express, making it easier to use in Express applications.
The csrf-csrf package is a lightweight alternative for CSRF protection. It offers similar functionalities to csrf but is designed to be simpler and more straightforward, making it a good choice for smaller projects or those that do not require the full feature set of csrf.
Logic behind CSRF token creation and verification. Read Understanding-CSRF for more information on CSRF. Use this module to create custom CSRF middleware and what not.
$ npm install csrf
var csrf = require('csrf')(options)
var secret = csrf.secretSync()
var token = csrf.create(secret)
var valid = csrf.verify(secret, token)
secretLength: 18
- the byte length of the secret keysaltLength: 8
- the string length of the salttokenize: (secret, salt) => token
- a custom token creation functionAsynchronously create a new secret
of length secretLength
.
If cb
is not defined, a promise is returned.
You don't have to use this.
csrf.secret().then(function (secret) {
})
csrf.secret(function (err, secret) {
})
Synchronous version of csrf.secret()
Create a CSRF token based on a secret
.
This is the token you pass to clients.
Check whether a CSRF token is valid based on a secret
.
If it's not valid, you should probably throw a 403
error.
FAQs
primary logic behind csrf tokens
The npm package csrf receives a total of 650,784 weekly downloads. As such, csrf popularity was classified as popular.
We found that csrf demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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