Question 1

How to validate nested objects with js-schema?

Accepted Answer

Use self-referencing schemas with patterns like schema({ left: [Number, schema.self] }) for recursive structures. For simple nesting, define object properties with sub-schemas, such as { user: { name: String, age: Number } }.

Question 2

js-schema vs Joi: which is better?

Accepted Answer

js-schema excels in readable, declarative syntax and JSON Schema interoperability, but Joi is more actively maintained, offers richer validation features, and better supports asynchronous validation. For modern projects, Joi is often preferred due to its updates and larger ecosystem.

Question 3

Can js-schema handle asynchronous validation?

Accepted Answer

No, js-schema is designed for synchronous validation only. The library validates data immediately and returns boolean results or error objects, so it's not suitable for async workflows like database checks or API calls during validation.

Question 4

How to generate JSON Schema from a js-schema definition?

Accepted Answer

Call the toJSON() method on any schema object or use JSON.stringify(schema) to serialize it. For example, var mySchema = schema({ name: String }); var jsonSchema = mySchema.toJSON();. Note that this only works reliably for schemas created within js-schema itself.

Question 5

Is js-schema compatible with TypeScript?

Accepted Answer

There are no official TypeScript definitions, and the library hasn't been updated since 2015, so compatibility is limited. You might need to write custom type definitions or use it with caution, as it lacks built-in type safety features.

Question 6

What are the performance implications of using js-schema?

Accepted Answer

Performance depends on schema complexity; deep equality checks and regex patterns can be costly for large objects. Since it's a runtime library, it adds overhead compared to compile-time solutions, but for typical use cases like API validation, it's generally efficient.

js-schema

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