Master two of MongoDB's most useful element operators: $exists and $type! This tutorial shows you exactly how to find documents based on whether a field exists, or based on the data type of a field.

What you will learn:

$exists: How to find documents that have a specific field ($exists: true), or do not have a specific field ($exists: false). This is perfect for cleaning up data or handling missing fields.

$type: How to find documents where a field is a specific data type (like "string", "double", "array", or "bool"). This is essential for querying collections with inconsistent data.

Example Query ($exists): db.users.find({ "email": { $exists: true } })

Example Query ($type): db.products.find({ "price": { $type: "double" } })

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