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{\n    const [errorMessage, putErrorMessage] = useState('')\n    useEffect(() =\u003e {\n        try {\n            validateUsername(username)\n            putErrorMessage('')\n        } catch (e) {\n            if (isInvalidUsernameError(e)) {\n                putErrorMessage(e.message)\n            }\n        }\n    }, [username, putErrorMessage])\n    return errorMessage\n}\n```\n\n#### Custom username block lists\n\n```typescript\nimport { validateUsername, isInvalidUsernameError } from  '@digitalcube/username-validator'\nconst additionalBlockLists = ['hello', 'world']\nconst useUsernameValidator = (username: string) =\u003e {\n    const [errorMessage, putErrorMessage] = useState('')\n    useEffect(() =\u003e {\n        try {\n            validateUsername(username, {blockLists: additionalBlockLists})\n            putErrorMessage('')\n        } catch (e) {\n            if (isInvalidUsernameError(e)) {\n                putErrorMessage(e.message)\n            }\n        }\n    }, [username, putErrorMessage])\n    return errorMessage\n}\n```\n\n### JavaScript\n\n```javascript\nconst {\n    validateUsername\n} = require('@digitalcube/username-validator')\n\nconst test = (username) =\u003e {\n    try {\n        validateUsername(username)\n        console.log(`=== Validation succeeded ===`)\n        console.log(`Username ${username} can use`)\n    } catch (e) {\n        console.error(`=== ${e.name} ===`)\n        console.error(e.message)\n    }\n    console.log('\\n')\n}\n\n\ntest(new Array(65).fill('a').join(''))\ntest('test')\ntest('test1')\ntest('test2')\ntest('shifter')\ntest('hello')\ntest('i09Nxxpv%ZqJ')\n\n\n=== InvalidUsernameError ===\nUsername should be 64 letters or less and is only allowed to contain alphanumeric, dot (.), hyphen (-) and underscore (_).\n\n\n=== InvalidUsernameError ===\nUsername: test is already exists.\n\n\n=== InvalidUsernameError ===\nUsername: test1 is already exists.\n\n\n=== InvalidUsernameError ===\nUsername: test2 is already exists.\n\n\n=== InvalidUsernameError ===\nUsername: shifter is already exists.\n\n\n=== Validation succeeded ===\nUsername hello can use\n\n\n=== InvalidUsernameError ===\nUsername should be 64 letters or less and is only allowed to contain alphanumeric, dot (.), hyphen (-) and underscore (_).\n\n```","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdigitalcube%2Fusername-validator","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fdigitalcube%2Fusername-validator","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdigitalcube%2Fusername-validator/lists"}