MongoDB Query Patterns

Trust Score 93/100

Guidelines and best-practice patterns for writing efficient Mongoose/MongoDB queries and avoiding common performance pitfalls (N+1, unindexed filters, unnecessa

triggers:mongoose queryfindByIdaggregatepopulatedb performancen+1batch with $in

GitHub SKILL.md

What it does

Provides concrete patterns and code examples to write efficient MongoDB/Mongoose queries: hoisting fetches, batching with $in, using .lean(), selective projections, bulkWrite, avoiding .populate() on lists, and indexing filter fields. Helps developers reduce round-trips and eliminate N+1 problems.

When to use it

Use this skill when adding or reviewing database operations in controllers or services, when building endpoints that read/write MongoDB, or when optimizing existing queries for performance and scalability. Triggers whenever a developer is about to write a new find/findById/aggregate/populate or when code reviews flag repeated queries.

What's included

Scripts: none included.
References: none listed.
Instructions: extensive guidance, checklists, rules, and TypeScript/JS code examples demonstrating correct and incorrect patterns, batching strategies, index recommendations, and concurrency tips.

Compatible agents

Developer-assistants and code-review agents (Claude Code, Copilot-style review bots, Codex-based assistants).

Audit Summary

A well-structured reference skill for MongoDB/Mongoose query optimization patterns. No scripts — purely instructional SKILL.md covering N+1 avoidance, batching, projection, lean queries, and bulk writes. Examples are clear, practical, and cover real-world pitfalls. Would benefit from a references/ directory or linked resources, but stands alone well as a coding guideline.

Watch Out

Purely instructional — no executable scripts to validate
Mongoose-specific; less applicable to native MongoDB driver or other ODMs
Some patterns (e.g., consolidate same-collection queries in memory) need size-bounded caveats already noted

Notes

No security concerns — no scripts, no network calls, no credentials, no destructive commands. Clean frontmatter with specific trigger description. Good use of WRONG/RIGHT pattern pairs. Checklist section is practical. Common Mistakes table is a nice addition. Architecture follows the skill spec well though lacks references/ or scripts/ directories.

Information

Repository: mern-ninja-cc
Stars: 8

Trust Score

Overall93

Security100

Code Quality88

Architecture82

Usefulness72

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