Data Types and Default Values in REST API

Bubu Tripathy
10 min readAug 17, 2023

When crafting REST APIs, the careful handling of data types and default values is a cornerstone of creating interfaces that are both robust and user-friendly. By thoroughly understanding these concepts and their implications, API developers can construct APIs that are intuitive, adaptable, and aligned with user expectations.

Data types, the fundamental building blocks of programming, wield significant influence when shaping API contracts. However, translating their essence into web APIs requires a nuanced approach that balances validation and flexibility.

Strings

Strings are a fundamental data type in REST APIs, enabling the representation of textual content, binary data, and identifiers. Here’s a closer look at how to handle string data within an API.

Bounds and Length Limits

When defining string fields, it’s important to set maximum length limits to ensure consistent data handling and prevent excessive resource consumption. Consider both the storage size and the actual character count, accounting for different character encodings. For example, using UTF-8 encoding, a 10-character string might require more than 10 bytes of storage.

Default and Null Values

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