Introduction to Querymen

Querymen is a powerful package for handling and validating API queries in Node.js applications. It provides a streamlined way to define query parameters, types, and validation rules. In this article, we’ll dive deep into the functionalities of Querymen and explore its various APIs with practical code examples.

Installation

npm install querymen

Defining Query Schemas

With Querymen, you can define query parameters for your API endpoints in a schema-like format. Here are some examples:

Basic Schema

 const { Schema } = require('querymen'); const schema = new Schema({
  name: String,
  age: Number
}); 

Advanced Schema with Validation

 const schema = new Schema({
  name: { type: String, required: true },
  age: { type: Number, min: 18 }
}); 

Using Schemas in Routes

Querymen allows you to apply these schemas directly within your route handlers:

 const express = require('express'); const querymen = require('querymen'); const app = express();
app.get('/users', querymen.middleware(schema), (req, res) => {
  res.json(req.querymen);
});
app.listen(3000, () => console.log('Server running on port 3000')); 

Complex Queries

Querymen can handle complex queries with nested objects, arrays, and custom validation.

Nested Object Example

 const userSchema = new Schema({
  name: String,
  age: Number,
  address: {
    country: String,
    city: String
  }
});
app.get('/users', querymen.middleware(userSchema), (req, res) => {
  res.json(req.querymen);
}); 

Custom Validation

You can add custom validation rules to your Querymen schemas.

 const schema = new Schema({
  email: {
    type: String,
    validate: (email) => /.+@.+\..+/.test(email)
  }
}); 

Practical App Example

Let’s build a simple user management app utilizing the functionalities we’ve discussed.

 const express = require('express'); const querymen = require('querymen'); const app = express();
// User Schema const userSchema = new Schema({
  name: { type: String, required: true },
  age: { type: Number, min: 18 },
  email: {
    type: String,
    validate: (email) => /.+@.+\..+/.test(email)
  }
});
// Routes app.get('/users', querymen.middleware(userSchema), (req, res) => {
  res.json(req.querymen);
});
app.listen(3000, () => console.log('User management app running on port 3000')); 

Using Querymen, you can efficiently manage query parameters and ensure your APIs are robust and secure.

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