[Help] How to access the underlying instance of ajv

[giovanni-bertoncelli]

💬 Question here

How to access the underlying instance of ajv in a plugin or a route without having to call setValidatorCompiler()?
For many reason this issue is similar to the one I opened here some years ago: #374, but somehow I keep fighting with this question. I want to access to the underlying fastify ajv instance (supposingly through the fastify.validatorCompiler decorator) but, upgrading fastify from 3.x to 4.x, that decorator is always null. I've tried by waiting the server to be ready but the field is always falsey. Is there any way to access ajv without setting a custom validator?

// example codes if any
app.addHook('onReady', function (done) {
      // logs undefined, undefined
      console.log(this.validatorCompiler, app.validatorCompiler)
      done();
  })

Your Environment

• node version: 20
• fastify version: >=4.0.0
• os: Mac

[Eomm]

It is null when you don't have any schema - it creates only if necessary

Thanks to these utilities: https://fastify.dev/docs/latest/Reference/Request/#validateinputdata-schema--httpstatus-httpstatus I wonder if you really need access it

[giovanni-bertoncelli]

Ok, thank you.. I'll try that method but I'm probably going to decorate fastify with a custom ajv instance at this point. I need this in order to validate payload in some parts of the application not strictly relative the HTTP handling (socket.io handlers, meta-schema validation, and some other cases). In all this cases I cannot rely on the "native" schema validation capabilities of fastify. Il mer 4 ott 2023, 18:03 Manuel Spigolon ***@***.***> ha scritto:

…

It is null when you don't have any schema - it creates only if necessary Thanks to these utilities: https://fastify.dev/docs/latest/Reference/Request/#validateinputdata-schema--httpstatus-httpstatus I wonder if you really need access it — Reply to this email directly, view it on GitHub <#942 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AP77QBSKJWSTD445C6LPYNDX5WCF5AVCNFSM6AAAAAA5SZE5J2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTONBXGIYTANRQGI> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[giovanni-bertoncelli]

@Eomm I've added a pull request for better documenting validatorCompiler usage. Let me know if it can be useful.