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ajv
The fastest JSON schema Validator. Supports JSON Schema draft-04/06/07/2019-09/2020-12 and JSON Type Definition (RFC8927)
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Schema Validation: Fastify gives you schema validation by default. It is my favorite feature of Fastify. It uses a package called AJV to validate your schema. Basically, in the schema, you can specify what data you want to receive or send. You can use schema validation for request body, response, query parameters, and so on. It is really helpful.
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