$project
Last updated
What is $project?
The $project stage in MongoDB aggregation pipelines is used to reshape documents by including, excluding, or transforming fields, allowing you to control exactly which data is passed to subsequent pipeline stages. It can perform field selection (similar to SQL SELECT), create computed fields using expressions, rename fields, nest or flatten document structures, and apply various transformations like mathematical operations, string manipulations, or date formatting.
Free resources to learn $project
- Official docsAggregation Pipeline
- Official docs$project
- Official docs$group
More in stage 5: Creating Indexes
$project: common questions
Can I learn $project 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 $project 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 $project tutorial for beginners?
It is lesson 42 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.