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LIFF

TANAKA HIROKITANAKA HIROKI
PS C:\Users\user\Desktop\line-liff-v2-starter-master> npm ci     
npm ERR! The `npm ci` command can only install with an existing package-lock.json or
npm ERR! npm-shrinkwrap.json with lockfileVersion >= 1. Run an install with npm@5 or
npm ERR! later to generate a package-lock.json file, then try again.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\user\AppData\Local\npm-cache\_logs\2021-12-18T12_43_49_246Z-debug.log
npm install

を実行して、package-lock.jsonを作成してから

npm ci

お次は、

PS C:\Users\user\Desktop\line-liff-v2-starter-master> npm start
npm ERR! Missing script: "start"
npm ERR!
npm ERR! Did you mean one of these?
npm ERR!     npm star # Mark your favorite packages
npm ERR!     npm stars # View packages marked as favorites
npm ERR! 
npm ERR! To see a list of scripts, run:
npm ERR!   npm run

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\user\AppData\Local\npm-cache\_logs\2021-12-18T12_49_21_546Z-debug.log

package.jsonの中に、

"start":"node server.js"

を追加でエラー解消