- Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.
- Steps to reproduce the issue:
In our ABP.io v8 Angular UI application, we are experiencing the following error when some users log in:
Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.
Upon investigation, we found that in the getFromToken function, the access token payload is decoded using atob. When the payload length is not a multiple of 4 (due to missing Base64 padding =), atob throws this error. This happens especially when the preferred_username claim contains an email (e.g., abc@de.com).
Current Code:(in remember-me.service.ts)
const tokenBody = accessToken.split('.')[1].replace(/-/g, '+').replace(/_/g, '/');
const parsedToken = JSON.parse(atob(tokenBody));
Suggested Fix: Add missing padding before calling atob:
while (tokenBody.length % 4 !== 0) {
tokenBody += '=';
}
Alternatively, using the jwt-decode library in Angular would be a more reliable approach.
3 Answer(s)
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0
The error occurs because the JWT access token payload is Base64Url encoded, and when its length is not a multiple of 4, the atob function in JavaScript throws an error due to missing padding. This is a known issue when decoding JWTs manually.
To fix this in your ABP Angular application, you should add the necessary padding to the token payload before calling atob. Here is the recommended approach:
const tokenBody = accessToken.split('.')[1].replace(/-/g, '+').replace(/_/g, '/'); let paddedTokenBody = tokenBody; while (paddedTokenBody.length % 4 !== 0) { paddedTokenBody += '='; } const parsedToken = JSON.parse(atob(paddedTokenBody));Alternatively, you can use a library like
jwt-decodeto handle the decoding, which automatically manages padding and decoding issues.This issue and workaround have been discussed in the ABP support portal. The ABP team has acknowledged the problem and suggested similar workarounds until an official fix is released.
Sources:
- remember-me.service.ts (ABP GitHub)
- ABP Support: Angular can't read AccessToken when encryption enabled
This response was generated by AI. If it didn’t solve your problem, feel free to post a new answer — our support team will jump in to help you soon.
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0
Hi, I will apply the temporary workaround, and I hope you will provide a permanent solution as well.
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0
hi
I will forward it to our Angular team.
Your ticket has been refunded.
Thanks.
https://github.com/abpframework/abp/issues/23796
