$size
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What is $size?
The $size operator in MongoDB matches documents where an array field has exactly the specified number of elements. It only works with arrays and requires an exact count match, not range queries. $size is useful for validating array lengths, filtering documents by array dimensions, and ensuring data consistency in array-based document structures.
Free resources to learn $size
- Official docs$size
- Article5 Ways to Check the Size of a Collection in MongoDB
More in stage 5: Creating Indexes
$size: common questions
Can I learn $size in Hindi?
This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain $size in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.
Is this $size tutorial for beginners?
It is lesson 50 of 106 in the free MongoDB roadmap, in stage 5, Creating Indexes. If you are new to MongoDB, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.