Panel-ready MERN Full Stack questions for freshers and experienced developers. Practice at Coding Cadre in Faridabad, or Online from Delhi NCR.
The API checks Redis for a key, returns the value on a hit, and on a miss loads MongoDB then writes Redis with a TTL.
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Cache-Control tells browsers and CDNs how long a response may be reused.
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TTL is how long a cached entry lives before it expires.
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A CDN caches JS, CSS, and images at the edge so users download them from a nearby location.
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On pull request you install, lint, test, and sometimes build the React app.
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An artifact is the compiled output you ship, such as a Docker image or a React dist folder.
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Use separate pipelines or separate jobs with different env secret sets.
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A location block matches /api and proxy_pass to the upstream Node port.
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try_files looks for a real file and otherwise returns index.html.
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Configuration belongs in the environment, not in committed files.
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Mongo fits flexible documents and fast iteration when schemas evolve.
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An index is a sorted structure that helps find documents without a full collection scan.
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Sessions store server-side state and send a session id cookie.
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An index on multiple fields matching common filters and sorts.
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Backend secrets stay in server env files never committed.
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Context or a small store hydrated from /me.
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JSON Schema rules on collections catch bad documents.
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Shared schema packages or OpenAPI-generated types.
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Build static assets, health-check new API instances, drain old ones, then point CDN to new files.
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Prefer httpOnly secure cookies with tight CSRF strategy.
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