잘해결되었습니다. 감사합니다!

변경해보고 다시 댓글 달겠습니다 감사합니다!

아 그리고 const bcrypt =&nbsp; &nbsp;required('bcrypt') 라고&nbsp;
되어 있는 부분 있을 텐데&nbsp; 그 부분을&nbsp; required('bcryptjs') 로 바꿔주시면 됩니다 ~ !&nbsp;

<p style="box-sizing: inherit; margin: 0px 0px 1em; padding: 0px; line-height: 1.6; font-size: 16px; color: #000a12; font-family: 'Noto Sans KR', -apple-system, system-ui, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', Helvetica; background-color: #ffffff;">1. node_module 폴더 지우기&nbsp;&nbsp;
<p style="box-sizing: inherit; margin: 0px 0px 1em; padding: 0px; line-height: 1.6; font-size: 16px; color: #000a12; font-family: 'Noto Sans KR', -apple-system, system-ui, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', Helvetica; background-color: #ffffff;">2. package-lock.json 파일 지우기&nbsp;
<p style="box-sizing: inherit; margin: 0px 0px 1em; padding: 0px; line-height: 1.6; font-size: 16px; color: #000a12; font-family: 'Noto Sans KR', -apple-system, system-ui, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', Helvetica; background-color: #ffffff;">3. package.json 파일에서 bcrypt 지우기
<p style="box-sizing: inherit; margin: 0px 0px 1em; padding: 0px; line-height: 1.6; font-size: 16px; color: #000a12; font-family: 'Noto Sans KR', -apple-system, system-ui, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', Helvetica; background-color: #ffffff;">4. npm install bcrypjks --save 하기
<div style="box-sizing: inherit; color: #eeffff; background-color: #263238; font-family: Menlo, Monaco, 'Courier New', monospace; font-size: 12px; line-height: 18px; white-space: pre;">
<div style="box-sizing: inherit;">"bcrypt": "^3.0.6",</div>
<div style="box-sizing: inherit;"></div>
</div>
<p style="box-sizing: inherit; margin: 0px 0px 1em; padding: 0px; line-height: 1.6; font-size: 16px; color: #000a12; font-family: 'Noto Sans KR', -apple-system, system-ui, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', Helvetica; background-color: #ffffff;">
<p style="box-sizing: inherit; margin: 0px 0px 1em; padding: 0px; line-height: 1.6; font-size: 16px; color: #000a12; font-family: 'Noto Sans KR', -apple-system, system-ui, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', Helvetica; background-color: #ffffff;">위에 4가지 방법을 시도해 보았지만 app crashed 현상이 일어나고 있습니다..

인프런 커뮤니티 질문&답변

[0] [nodemon] app crashed - waiting for file changes before starting... 질문 드립니다.