npm Version Drift and Outdated Node.js Silently Broke LINE Bot Feature for Three Days

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A developer discovered that a URL-summarization feature in their LINE chatbot had been silently failing for three days due to an unlocked npm package version in the Docker image. The single-file-cli package quietly upgraded to a version requiring Node.js 22.4 or later, while the container was still running Node 18. All three fallback methods for fetching webpage content failed, but the bot only surfaced a generic error to users with no indication of the root cause. The debugging process revealed that a successful npm build does not guarantee runtime functionality, since npm treats engine version mismatches as warnings rather than build failures. The developer resolved the issue through multiple Dockerfile rebuild cycles, each followed by live runtime testing rather than relying solely on build logs.

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