what datatype can be stored in systems manager param store?

Hello.

It is possible to register JSON as below.
The data type is registered as "String", so when referencing it from the AWS SDK etc., processing such as parsing the string is required.

AWS Systems Manager Parameter Store can store data as:

• String: Plain text, including serialized JSON or XML.
• StringList: A comma-separated list of plain text values.
• SecureString: Encrypted text, suitable for sensitive data, encrypted with AWS KMS.

All types essentially store data as strings, meaning complex data structures must be serialized into a string format before storage and deserialized upon retrieval.

Resources:

• Parameters