What Type of Data Can Be Stored in DynamoDB?


Heather Bennett

When working with DynamoDB, it is important to understand the types of data that can be stored in this NoSQL database. DynamoDB is a fully managed service provided by Amazon Web Services (AWS) that offers fast and flexible document and key-value store capabilities.

Data Types in DynamoDB

DynamoDB supports various data types, including:

  • String: This type represents a sequence of Unicode characters. It can be used to store text, URLs, email addresses, and more.
  • Number: The number type can store both integers and floating-point values. It is suitable for storing numerical data such as prices, ratings, and quantities.
  • Boolean: This type can only have two possible values: true or false. It is often used to represent binary choices or conditions.
  • Binary: Binary data refers to sequences of bytes and can be used to store images, audio files, or any other file-like content.
  • Null: As the name suggests, this type represents the absence of a value. It can be useful in cases where a value may not exist for a particular attribute.
  • List: A list is an ordered collection of elements.

    Each element within the list can have its own data type. For example, you could have a list of strings or a list of numbers.

  • Set: A set is similar to a list but does not allow duplicate values. Sets are unordered collections that do not preserve the order in which elements are added.
    • String Set: A set of strings.
    • Number Set: A set of numbers.
    • Binary Set: A set of binary values.
  • Map: A map is a collection of key-value pairs. The keys within a map must be unique, and each value can have its own data type. Maps are useful for representing complex data structures.

Data Type Considerations

When designing your DynamoDB schema, it is essential to consider the data types that best suit your application’s needs. Choosing the appropriate data types can help optimize performance and simplify data retrieval and manipulation.

If you need to store hierarchical or nested data structures, such as JSON objects, you can use maps and lists to represent them in DynamoDB. This allows you to store complex data in a single attribute.

Additionally, DynamoDB allows you to define secondary indexes on one or more attributes of an item. These indexes enable efficient querying based on different attributes, improving read performance for specific use cases.


DynamoDB offers a wide range of data types to accommodate various application requirements. Understanding these data types and their characteristics will help you design efficient and scalable database schemas for your applications.

In summary, DynamoDB supports string, number, boolean, binary, null, list, set (string set/number set/binary set), and map data types. By leveraging these flexible options wisely, you can create powerful applications that harness the full potential of DynamoDB’s capabilities.

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