Introduction to Fluent Schema

Fluent Schema is a powerful JavaScript library used for building and composing JSON schemas. This library offers a rich API that provides an easy and fluent way to express complex JSON schema structures. It is particularly useful in server-side applications and is commonly used with web frameworks like Fastify.

Common APIs of Fluent Schema

The Fluent Schema API is designed to be user-friendly and intuitive. Here are some of the common APIs provided by Fluent Schema:

createSchema

The createSchema function is used to initialize a new schema.

 const { createSchema } = require('fluent-schema') const schema = createSchema() 

object

The object function defines an object type in the schema.

 const { object, string } = require('fluent-schema') const personSchema = object()
  .prop('firstName', string().required())
  .prop('lastName', string().required())

array

The array function defines an array type in the schema.

 const { array, string } = require('fluent-schema') const tagsSchema = array().items(string()) 

integer

The integer function defines an integer type in the schema.

 const { integer } = require('fluent-schema') const ageSchema = integer().minimum(0).maximum(120) 

Application Example

Here is an example of a simple Fastify application that uses Fluent Schema for data validation:

 const Fastify = require('fastify') const { object, string, integer } = require('fluent-schema')
const app = Fastify()
const userSchema = object()
  .prop('username', string().required())
  .prop('password', string().minLength(6).required())
  .prop('age', integer().minimum(18).required())

app.post('/register', { schema: { body: userSchema } }, (request, reply) => {
  const { username, password, age } = request.body

  // Handle user registration

  reply.send({ message: 'User registered successfully' })
})
app.listen(3000, (err, address) => {
  if (err) throw err
  console.log(`Server running at ${address}`)
}) 

This code defines a simple Fastify server with a registration endpoint that uses Fluent Schema for validating the request body.

Using Fluent Schema ensures that the data structures and their constraints are defined in a clear, maintainable, and reusable manner.

For more information, be sure to check out the official Fluent Schema documentation.

Happy coding!

Hash: d5c6670bb4d318cacd9185ee6b2d4fb580ce3209f3bacedd342592ba6fb77e86