Question 1

How to create a JSON Schema for an API response?

Accepted Answer

Define the structure using keywords like 'type', 'properties', and 'required' for nested objects. Start with a basic schema and incrementally add constraints like 'minLength' or 'pattern' based on your data requirements.

Question 2

JSON Schema vs OpenAPI for API documentation?

Accepted Answer

JSON Schema validates JSON data structures, while OpenAPI describes entire APIs including endpoints and methods. OpenAPI often uses JSON Schema for request/response bodies, so JSON Schema is more focused on data validation within APIs.

Question 3

What are the differences between JSON Schema draft versions?

Accepted Answer

Newer versions like 2019-09 introduce features like 'unevaluatedProperties' for better validation control and formalized vocabularies. Always check the specification updates for breaking changes, as older drafts may lack support for newer keywords.

Question 4

How to validate JSON in JavaScript using JSON Schema?

Accepted Answer

Use a library like Ajv that implements the specification. Install it via npm, define your schema, and call the validation function to check JSON data, returning errors if constraints are violated.

Question 5

Can JSON Schema handle dynamic or conditional validation?

Accepted Answer

Yes, through keywords like 'if', 'then', 'else', and dynamic references with '$ref'. However, this can add complexity, and not all validators fully support advanced conditional logic.

Question 6

Best tools to generate JSON Schema from existing JSON?

Accepted Answer

Online generators or CLI tools like 'quicktype' can infer schemas from JSON samples. For accurate results, manually refine the schema to include all constraints, as automated tools may miss nuances like custom formats.

Question 7

Is JSON Schema supported in Python or Java?

Accepted Answer

Yes, implementations like 'jsonschema' for Python and 'Jackson' for Java provide validation. Check the JSON Schema website for a list of validated libraries, but be aware that support for newer draft features may vary.

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