Question 1

How do I validate JSON data with z-schema in Node.js?

Accepted Answer

Install the package via npm, import ZSchema, create a validator with ZSchema.create(), then call validate() with your data and schema. Use options like { async: true } for asynchronous validation or { safe: true } for non-throwing results.

Question 2

z-schema vs ajv: which should I use?

Accepted Answer

z-schema stands out for its full draft support and flexible validation modes (sync/async, throw/safe), while ajv is often praised for raw speed. Choose z-schema if you need strict compliance across multiple JSON Schema drafts or async format validators.

Question 3

How to handle asynchronous validation in z-schema?

Accepted Answer

Create a validator with { async: true } using ZSchema.create(), then use await on the validate() method which returns a promise. Combine with { safe: true } for a promise that always resolves with a result object, avoiding rejections.

Question 4

Does z-schema support custom format validators?

Accepted Answer

Yes, you can register custom synchronous or asynchronous format validators via registerFormat(), allowing checks like string patterns or database lookups, as demonstrated in the custom format validators section.

Question 5

What JSON Schema drafts does z-schema support?

Accepted Answer

z-schema fully supports drafts 2020-12, 2019-09, draft-07, draft-06, and draft-04, with the default set to draft-2020-12 in the latest version, making it versatile for various schema standards.

Question 6

How to migrate from an older version of z-schema to v12?

Accepted Answer

Consult the MIGRATION.md document for detailed steps. Key changes include the factory API shift to ZSchema.create() and updates to default draft versions, so test your schemas and validation calls after upgrading.

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