Swagger Authorize Button Error on Strapi 4. After installation it will be fixed and the swagger authorization button will be ready for use.. add the swaggerFix.js file to the root of your strapi project

package.json

{
  // other here
  "scripts": {
    "postinstall": "node swaggerFix.js",
    // others here
  }
}

swaggerFix.js

/**
 * Fix bug in Strapi 4
 * Swagger Authorize Button Error
 * Source: <https://github.com/strapi/strapi/pull/16788/commits/23de7e699cb88de94dbf87c9ea9f265a1415fe7a>
 */
const fs = require('fs');
const path = require('path');

const filePath = path.resolve(__dirname, '../node_modules/@strapi/plugin-documentation/server/services/documentation.js');

fs.readFile(filePath, 'utf8', (err, data) => {
  if (err) {
    console.error(err);
    return;
  }

  const newString = data.replace(
    /if \(generatedSchemas\) \{\s+draft\.components = \{\s+schemas: \{ \.\.\.draft\.components\.schemas, \.\.\.generatedSchemas \},\s+\};\s+\}/,
    'draft.components.schemas = { ...draft.components.schemas, ...generatedSchemas };'
  );

  fs.writeFile(filePath, newString, 'utf8', (err) => {
    if (err) {
      console.error(err);
      return;
    }
    console.log('Fixed with success!');
  });
});