Introduction to camelcase-keys

The camelcase-keys library is a powerful tool for transforming object property names into camelCase. This is particularly useful in JavaScript projects where you need to ensure consistent property naming conventions when working with APIs or other data sources. In this blog post, we’ll explore a range of APIs provided by camelcase-keys with examples to help you understand and utilize this library efficiently.

Getting Started

First, you need to install camelcase-keys in your project:

npm install camelcase-keys

Basic Usage

Here’s a simple example of how to transform all object keys to camelCase:

const camelcaseKeys = require('camelcase-keys');

const obj = {
    'user_name': 'John Doe',
    'email_address': 'john@example.com'
};

const camelCasedObj = camelcaseKeys(obj);
console.log(camelCasedObj);
//=> { userName: 'John Doe', emailAddress: 'john@example.com' }

Transforming Nested Keys

By default, camelcase-keys will not convert keys of nested objects. You can enable this feature by passing an additional parameter:

const obj = {
    'user_data': {
        'user_name': 'John Doe'
    }
};

const camelCasedObj = camelcaseKeys(obj, { deep: true });
console.log(camelCasedObj);
//=> { userData: { userName: 'John Doe' } }

Excluding Keys

You can also exclude certain keys from being converted by providing an array of keys to the exclude option:

const obj = {
    'user_name': 'John Doe',
    'email_address': 'john@example.com'
};

const camelCasedObj = camelcaseKeys(obj, { exclude: ['email_address'] });
console.log(camelCasedObj);
//=> { userName: 'John Doe', email_address: 'john@example.com' }

Transforming Arrays of Objects

camelcase-keys can also handle arrays of objects:

const arr = [
    { 'user_name': 'John Doe' },
    { 'user_name': 'Jane Doe' }
];

const camelCasedArr = camelcaseKeys(arr);
console.log(camelCasedArr);
//=> [ { userName: 'John Doe' }, { userName: 'Jane Doe' } ]

Application Example

Let’s create a small application that uses the camelcase-keys library:

const express = require('express');
const camelcaseKeys = require('camelcase-keys');

const app = express();
app.use(express.json());

app.post('/submit', (req, res) => {
    const camelCasedBody = camelcaseKeys(req.body, { deep: true });
    console.log(camelCasedBody);
    res.send(camelCasedBody);
});

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});

Here, we create an Express server that accepts POST requests, transforms the incoming JSON body keys to camelCase, and returns the transformed object. This ensures that all object properties in your application follow the camelCase convention systematically.

By integrating the camelcase-keys library, you can streamline your code and maintain consistent naming conventions effortlessly.

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