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@rudderstack/analytics-js-cookies

RudderStack JavaScript SDK utilities for cookies in browser and Node.js environments. Use the appropriate functions for your environment.

APIs

$3

> :warning: Only for browser environments

This function decrypts the provided encrypted RudderStack JavaScript cookie value using the RudderStack JavaScript SDK encryption version "v3".

> If the provided value is either not encrypted or not properly encrypted, the function returns null.

> :warning: Any errors during decryption are swallowed by the function, returning null.

``javascript
import { getDecryptedValueBrowser } from '@rudderstack/analytics-js-cookies';

const encryptedCookieValue = 'RS_ENC_v3_InRlc3QtZGF0YSI=';
const decryptedCookieValue = getDecryptedValueBrowser(encryptedCookieValue);
console.log('Decrypted Cookie Value: ', decryptedCookieValue);
// Output:
// Decrypted Cookie Value: test-data
`

$3

> :warning: Only for Node.js environments

This function decrypts the provided encrypted RudderStack JavaScript cookie value using the RudderStack JavaScript SDK encryption version "v3".

> If the provided value is either not encrypted or not properly encrypted, the function returns null.

> :warning: Any errors during decryption are swallowed by the function, returning null.

`javascript
import { getDecryptedValue } from '@rudderstack/analytics-js-cookies';

const encryptedCookieValue = 'RS_ENC_v3_InRlc3QtZGF0YSI=';
const decryptedCookieValue = getDecryptedValue(encryptedCookieValue);
console.log('Decrypted Cookie Value: ', decryptedCookieValue);
// Output:
// Decrypted Cookie Value: test-data
`

$3

> :warning: Only for browser environments

This function takes the name of the RudderStack JavaScript SDK cookie and returns the decrypted value.

The return type is either a string or an object as some cookies like user ID, anonymous user ID have string values while user traits are objects.

It returns null in either of the following scenarios:

- If the cookie is not present.
- If the cookie is not properly encrypted.
- It only decrypts the cookies that are created by the RudderStack JavaScript SDK encryption version "v3".
- If the decrypted cookie value is not a valid JSON string.
- If the provided cookie name is not a valid RudderStack JavaScript SDK cookie name.

> :warning: Any errors during decryption are swallowed by the function, returning null.

The following cookie keys are exported which can be used with this function:

- userIdKey: The key for the user ID cookie.
- userTraitsKey: The key for the user traits cookie.
- anonymousUserIdKey: The key for the anonymous user ID cookie.
- groupIdKey: The key for the group ID cookie.
- groupTraitsKey: The key for the group traits cookie.
- pageInitialReferrerKey: The key for the page initial referrer cookie.
- pageInitialReferringDomainKey: The key for the page initial referring domain cookie.
- sessionInfoKey: The key for the session ID cookie.
- authTokenKey: The key for the auth token cookie.

`javascript
import {
getDecryptedCookieBrowser,
anonymousUserIdKey,
userTraitsKey,
} from '@rudderstack/analytics-js-cookies';

const anonymousId = getDecryptedCookieBrowser(anonymousUserIdKey);
console.log('Anonymous User ID: ', anonymousId);
// Output:
// Anonymous User ID: 2c5b6d48-ea90-43a2-a2f6-457d27f90328

const userTraits = getDecryptedCookieBrowser(userTraitsKey);
console.log('User Traits: ', userTraits);
// Output:
// User Traits: {"email":"abc@xyz.com","name":"John Doe"}

const invalidCookie = getDecryptedCookieBrowser('invalid-cookie-name');
console.log('Invalid Cookie: ', invalidCookie);
// Output:
// Invalid Cookie: null
`

Debugging

As all the above APIs swallow the errors, you can set the debug argument to true to log the errors.

`javascript
import { getDecryptedValue } from '@rudderstack/analytics-js-cookies';

const encryptedCookieValue = 'RS_ENC_v3_InRlc3QtZGF0YSI-some-random-data';

// Set the debug flag to true
const decryptedCookieValue = getDecryptedValue(encryptedCookieValue, true);
console.log('Decrypted Cookie Value: ', decryptedCookieValue);

// Output:
// Error occurred during decryption: Unexpected non-whitespace character after JSON at position 11
// Decrypted Cookie Value: null
``

License

This project is licensed under the Elastic License 2.0. See the LICENSE.md file for details. Review the license terms to understand your permissions and restrictions.

If you have any questions about licensing, please contact us or refer to the official Elastic licensing page.

Contribute

We invite you to contribute to this project. For more information on how to contribute, please see here.

Contact us

For more information on any of the sections covered in this readme, you can contact us or start a conversation on our Slack channel.

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[rudderstack-blog]: https://rudderstack.com/blog/
[slack]: https://resources.rudderstack.com/join-rudderstack-slack
[twitter]: https://twitter.com/rudderstack
[linkedin]: https://www.linkedin.com/company/rudderlabs/
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[youtube]: https://www.youtube.com/channel/UCgV-B77bV_-LOmKYHw8jvBw
[hackernews]: https://news.ycombinator.com/item?id=21081756
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