Jwt Authentication error Argument 3 passed to Lcobucci\JWT\Signer\Hmac::doVerify()

Question

I'm working on a project to learn laravel, I saw a couple of tutorials to use jwt auth in this. It was working good but now is show an error not always but I don't know why. this is it:

Argument 3 passed to Lcobucci\JWT\Signer\Hmac::doVerify() must be an instance of Lcobucci\JWT\Signer\Key, null given, called in C:\xampp\htdocs\inmobiliaria\vendor\lcobucci\jwt\src\Signer\BaseSigner.php on line 42

Sometimes it works but not another. so I don't know what can I do. I tried with

1. php artisan cache:clear
2. php artisan config:clear
3. php artisan jwt:secret

but the problem still there, sometimes i get good answer from server(200) but the most part of then al bad (500).

Screenshots

Solution 1

Here's complete snippet

php artisan key:generate
php artisan jwt:secret
php artisan cache:clear
php artisan config:clear

Before run above commands make sure there is install jwt package, than check its config file name jwt.php in config folder.

Solution 2

In fact it's the right thing to solve it:

php artisan key:generate
php artisan jwt:secret

Solution 3

This error can occur when

• JWT_SECRET is missing on the .env
• JWT_SECRET is commented in the .env
• The value of JWT_SECRET is wrong.

In my case, running php artisan jwt:secret it was appending the key on the current JWT_SECRET. So checking my .env file, the value of JWT_SECRET was very long and wrong (it should be 64 chars long).

To solve it:

1. Open the .env and remove the JWT_SECRET value (note that you have to remove it and not comment it).
2. Run php artisan jwt:secret
3. Run php artisan cache:clear && php artisan config:clear

Solution 4

I came across this error when I deployed my application after testing and everything else worked well on the local server.

I noticed the following;

• It's possible that you are getting this error when you uploaded the applications before implementing the JWT and re-uploaded directly via the Cpanel upload without reuploading the .env file.

  • if this is the case, the simplest way to solve this is my merely adding the JWT:key in your .env file (at the bottom) ef

JWT_SECRET=roCZauuldMpw5i4039393939393372y98bEWumqd9ls7Uk8DEpr0gIZ6WIWB

Hope this helps :)

Solution 5

php artisan jwt:secret
php artisan config:cache

These both command will be enough

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