Query string validation in Fastify
Software engineering

Query string validation in Fastify

How to validate query parameters using Fastify
Bartosz Mikulski
Bartosz Mikulski – 1 min read

What does the example of query string validation look in the Fastify documentation? Like this:

const schema = {
  querystring: {
    name: { type: 'string' },
    excitement: { type: 'integer' }
  }
}

What is the problem? It is a lie!

The correct way of defining the schema of query parameters in this case (two values: “name” and “excitement”). Looks like this:

const querySchema = {
    schema: {
       querystring: {
         type: 'object',
           properties: {
             name: {
               type: 'string'
             },
             excitement: {
               type: 'integer'
             },
         }
     }
  }
}

Additionally, if we want to make the name parameter mandatory, we add it to the array of required parameters:

const querySchema = {
    schema: {
       querystring: {
         type: 'object',
           properties: {
             name: {
               type: 'string'
             },
             excitement: {
               type: 'integer'
             },
         }
         required: ['name']
     }
  }
}
Older post

Mental models: inversion

Solve the opposite problem to avoid stupidity.

Newer post

A comprehensive guide to putting a machine learning model in production using Flask, Docker, and Kubernetes

How to use Docker and Flask to put a Scikit model in production as a microservice.

Related Posts

Software engineering

Assert object pattern

The easiest way to make your tests more readable and easier to maintain
Published on: 12 Dec 2018

Software engineering

A "known bug" is still a bug

What does a "known bug" or an update say our users?
Published on: 05 Oct 2018

Software engineering

Language is all about nouns

Programmers are afraid of nouns. We often replace them with poorly written descriptions of things.
Published on: 12 Sep 2018

Are you looking for an experienced AI consultant? Do you need assistance with your RAG or Agentic Workflow?
Schedule a call, send me a message on LinkedIn. Schedule a call or send me a message on LinkedIn

>