How can I access another plugin’s registered options inside Fastify?

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I have a situation where multiple plugins are registered in my Fastify app. Each plugin can receive its own options object when registered, for example:

fastify.register(require('./pluginA'), { foo: 'bar' })
fastify.register(require('./pluginB'))

In pluginB, I’d like to access the options that were passed to pluginA

Is there a built-in or recommended way to access another plugin’s options directly?

The plugin should be registered with Symbol.for('skip-override') to customize the upper context instead of creating a new one. Recommend you to use fastify-plugin to wrap your plugins, includes all these settings by default

fastify.register(fp(require('./pluginA'), { name: "pluginA" }), { foo: 'bar' })

fastify.register(fp(async function (fastify, opts) {
  // Can I access the options of pluginA here?
  // For example: { foo: 'bar' }
}))

Is there a way to access another plugin’s options like this?

Unless the plugin exposes somehow that information, is not currently possible

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How can I access another plugin’s registered options inside Fastify? #1108

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How can I access another plugin’s registered options inside Fastify? #1108

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metcoder95 commented on Aug 26, 2025

inyourtime commented on Aug 26, 2025

metcoder95 commented on Aug 27, 2025

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