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59 lines
2.3 KiB
59 lines
2.3 KiB
# @fastify/ajv-compiler
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[](http://standardjs.com/)
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[](https://github.com/fastify/ajv-compiler/actions/workflows/ci.yml)
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This module manages the [`ajv`](https://www.npmjs.com/package/ajv) instances for the Fastify framework.
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It isolates the `ajv` dependency so that the AJV version is not tightly coupled to the Fastify version.
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This allows the user to decide which version of AJV to use in their Fastify based application.
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## Versions
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| `@fastify/ajv-compiler` | `ajv` | Default in `fastify` |
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|------------------------:|------:|---------------------:|
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| v1.x | v6.x | ^3.14 |
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### AJV Configuration
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The Fastify's default [`ajv` options](https://github.com/ajv-validator/ajv/tree/v6#options) are:
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```js
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{
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coerceTypes: true,
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useDefaults: true,
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removeAdditional: true,
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// Explicitly set allErrors to `false`.
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// When set to `true`, a DoS attack is possible.
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allErrors: false,
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nullable: true
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}
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```
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To customize them, see how in the [Fastify official docs](https://www.fastify.io/docs/latest/Server/#ajv).
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## Usage
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This module is already used as default by Fastify.
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If you need to provide to your server instance a different version, refer to [the official doc](https://www.fastify.io/docs/latest/Server/#schemacontroller).
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### How it works
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This module provide a factory function to produce [Validator Compilers](https://www.fastify.io/docs/latest/Server/#validatorcompiler) functions.
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The Fastify factory function is just one per server instance and it is called for every encapsulated context created by the application through the `fastify.register()` call.
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Every Validator Compiler produced has a dedicated AJV instance, so, this factory will try to produce as less as possible AJV instances to reduce the memory footprint and the startup time.
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The variables involved to choose if a Validator Compiler can be reused are:
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- the AJV configuration: it is [one per server](https://www.fastify.io/docs/latest/Server/#ajv)
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- the external JSON schemas: once a new schema is added to a fastify's context, calling `fastify.addSchema()`, it will cause a new AJV inizialization
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## License
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Licensed under [MIT](./LICENSE).
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