How to set cookie without signature in nodejs

In the process of developing web applications using Node.js, setting cookies is an essential function. A cookie is a way of interaction between the browser and the server. Its function is to allow the server to identify the user and provide him with personalized services. In Node.js, modules such as express and cookie-parser are provided to help us implement Cookie processing, and by default, Cookies are signed. However, there are some scenarios where we may need to set cookies without signatures. This article will introduce how to set cookies without signatures in Node.js.

What is a signature

In Node.js, when parsing a cookie, the secret is used to verify whether the cookie has been tampered with. If the secret does not match, the key and value of the cookie cannot be parsed. This process is called signing.

By default, a signature will be automatically added when parsing cookies using cookie-parser, as follows:

app.use(cookieParser('your secret'));

your secret in the above code It's just an encryption key, it can be any string you want. When you pass the secret parameter, cookie-parser will use this key to calculate the correct signature when parsing the cookie, thereby ensuring the security of the cookie.

How to set cookies without signature

Normally, we would like cookies to be signed to improve security. However, there are some scenarios where we need to set cookies without signing, such as:

• When we need to store some sensitive information on the client, but do not want to use localStorage or sessionStorage.
• Some users wish to disable cookie signing.

In this case, we need to manually disable the signing function. In cookie-parser, it comes with a library function __cookie.serialize__, which can be used to manually serialize cookies.

let cookie = require('cookie');

let serializedCookie = cookie.serialize('key', 'value', {
  httpOnly: true,
  path: '/',
});
res.setHeader('Set-Cookie', serializedCookie);

In the above code, the cookie.serialize function is used to serialize an unsigned Cookie and set it to the Set-Cookie attribute of the response header. superior.

Among them, the first parameter 'key' represents the name of the cookie, and the second parameter 'value' represents the value of the cookie. The third parameter is options__, which is an object containing various cookie options, such as __httpOnly__, __expires__, __secure, etc. Here, we set the two properties httpOnly and path.

It should be noted that if you disable cookie signature, you must take some measures to ensure that the cookie is not tampered with, such as using the HTTPS protocol to encrypt the transmitted data.

Summary

In Node.js, setting cookies is an essential function. By default, a signature is automatically added when parsing cookies using cookie-parser to improve cookie security. However, in some scenarios we need to manually disable the cookie signature function. This article explains how to set unsigned cookies in Node.js. I hope the introduction in this article will be helpful to you.

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