Composer could not install tymon/jwt-auth

I found a (temporary) solution.
To get Laravel 5.8 compatibility, perform:

composer require tymon/jwt-auth ^1.0.0-rc.4.1

See discussion in this Github issue.

this command worked for me in Laravel 8:

composer require -w tymon/jwt-auth --ignore-platform-reqs

composer.json

{"name": "laravel/laravel","type": "project","description": "The Laravel Framework.","keywords": [    "framework",    "laravel"],"license": "MIT","require": {    "php": "^7.3|^8.0",    "fideloper/proxy": "^4.4.1",    "fruitcake/laravel-cors": "^2.0.3",    "guzzlehttp/guzzle": "^7.0.1",    "laravel/framework": "^8.0",    "laravel/passport": "^10.0",    "laravel/tinker": "^2.5|dev-develop",    "paragonie/random_compat": "2.*"    },"require-dev": {    "fakerphp/faker": "^1.9.1",    "mockery/mockery": "^1.4.2",    "nunomaduro/collision": "^5.0",    "phpunit/phpunit": "^9.3.3"},"config": {    "optimize-autoloader": true,    "preferred-install": "dist",    "sort-packages": true},"extra": {    "laravel": {        "dont-discover": []    }},"autoload": {    "psr-4": {        "App\\": "app/",        "Database\\Factories\\": "database/factories/",        "Database\\Seeders\\": "database/seeders/"    }},"autoload-dev": {    "psr-4": {        "Tests\\": "tests/"    }},"minimum-stability": "dev","prefer-stable": true,"scripts": {    "post-autoload-dump": [        "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",        "@php artisan package:discover --ansi"    ],    "post-root-package-install": [        "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""    ],    "post-create-project-cmd": [        "@php artisan key:generate --ansi"    ]}}

To install this package you will need:

Laravel 4 or 5 (see compatibility table)PHP 5.4 +

Install via composer - edit your composer.json to require the package.

"require": {    "tymon/jwt-auth": "0.5.*" }

Then run composer update in your terminal to pull it in.

The installation is there https://github.com/tymondesigns/jwt-auth/wiki/InstallationThere is nothing said about dev-master, try with 0.5.*