Learning term
package.json — Backends and web APIs
package.json forms the JavaScript runtime, package tool, and project manifest of a Node project. This card shows its role in “Backends and web APIs” and a safe diagnostic path.
Orientation
package.json forms the JavaScript runtime, package tool, and project manifest of a Node project. At this level, separate purpose, input, and visible result. Place package.json within Backends and web APIs before changing settings or files.
Practical use
Compare runtime version and lockfile when code works locally but fails in the image. Start in a sandbox with neutral examples. Record the expected state, make one controlled change, and compare status output, application behavior, and logs.
Technical understanding
package.json forms the JavaScript runtime, package tool, and project manifest of a Node project. Technically, package.json connects through interfaces, configuration, state, or dependencies. Trace data from input to output and check versions, permissions, networking, storage, and resources separately.
Operations and debugging
Compare runtime version and lockfile when code works locally but fails in the image. In production-like operations, use measurable signals, least privilege, reproducible configuration, and a documented rollback. Preserve evidence, isolate the cause, and verify the correction with the same test.
Exercise
Try it safely
Compare runtime version and lockfile when code works locally but fails in the image. Open an isolated test environment and run “python --version && curl -s http://127.0.0.1:8000/openapi.json”. Write down the expected output first, do not alter production data, and record one safe next diagnostic step.
python --version && curl -s http://127.0.0.1:8000/openapi.jsonQuick check
Can you explain the purpose, observable state, and most common failure source of package.json — Backends and web APIs in one sentence each? Which evidence would you preserve before changing anything, and which repeated test would prove that the correction actually worked?