Fastify disable schema validation

Question

I'm looking for the best way to disable programmatically the json-schema validation for all routes in a fastify instance:

module.exports = async (fastify, opts) => {
  fastify.get('/stations.json', {schema: opts.schema}, async req => {
    return {
      ...
    };
  });
}

this is a working way:

  ...global config definitions...

  fastify.addHook('onRoute', route => {
    if (config.validation === false && route.schema) {
      route.schema = null
      console.log('Route disable:',route.path)
    }
  })

The problem with this solution is that it breaks fastify swagger-ui, instead I what simply to disable the validation in routes, keeping the schema definition for each one. I guess it could be done with the method: fastify.setValidatorCompiler() but I'm not very clear how I could use it. I would like to bypass executing validation functions in routes if possible, not just executing "empty functions".

Dmitry Zakharov · Accepted Answer · 2024-11-19 09:54:07Z

2

The correct answer is:

fastify.setValidatorCompiler(() => () => true);

The {value: T} is designed for validation libraries that do transformations. So the answer with it would only work in this case:

fastify.setValidatorCompiler(() => {
  return (value) => ({ value });
  // ----^ notice that we get the value from args and return it
});

https://github.com/fastify/fastify/blob/816f852c56e229d3af4784b1a3705a50725c3f37/types/schema.d.ts#L35-L43

edited Nov 19, 2024 at 9:54

answered Nov 7, 2024 at 19:48

Dmitry Zakharov

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2 Comments

stefcud Over a year ago

please can you add some references in docs?

Dmitry Zakharov Over a year ago

Added link to .d.ts

felixmosh · Accepted Answer · 2023-08-21 14:19:16Z

Based on fastify docs, validatorCompiler is a function that gets data, validate it and returns either {value: true/false} or {error: your error}.

setValidatorCompiler is a function that needs to return validatorCompiler (which is a function).

Therefore, you can set a validatorCompiler on the fastify instance, that will return always true.

const fastify = require('fastify')();

fastify.setValidatorCompiler(() => {
  return () => ({ value: true });
  // ----^ this is the validatorCompiler
});

I didn't tested this code, but, based on the docs page, it should work.

Flash Noob · Accepted Answer · 2024-01-30 11:31:28Z

0

schema validation is done by ajv plugin which can be disabled by using the code below

 const fastify=require('fastify')
  ({
  ajv:{customOptions:{strict:false}}
})

answered Jan 30, 2024 at 11:31

Flash Noob

5205 silver badges12 bronze badges

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