Introduction to load-json-file

The load-json-file is a popular npm package that allows you to read and parse JSON files effortlessly in your Node.js applications. This guide will introduce you to its capabilities with dozens of useful API explanations accompanied by code snippets.

API Examples

Installation

  npm install load-json-file

Basic Usage

  
  const loadJsonFile = require('load-json-file');
  
  loadJsonFile('example.json').then(json => {
      console.log(json);
  });
  

Reading JSON Synchronously

  
  const loadJsonFile = require('load-json-file');
  const fs = require('fs');
  
  const data = fs.readFileSync('example.json', 'utf8');
  const json = JSON.parse(data);
  console.log(json);
  

Handling Errors

  
  const loadJsonFile = require('load-json-file');
  
  loadJsonFile('example.json').then(json => {
      console.log(json);
  }).catch(error => {
      console.error('Failed to load the JSON file:', error);
  });
  

Loading JSON from URL

  
  const fetch = require('node-fetch');
  
  fetch('https://api.example.com/data.json')
    .then(response => response.json())
    .then(json => console.log(json))
    .catch(error => console.error('Error fetching data:', error));
  

App Example with APIs

Here’s a simple Node.js app that uses load-json-file to read a config file and log it to the console.

Project Structure

  
  myapp/
  ├── config.json
  └── index.js
  

config.json

  
  {
    "appName": "MyApp",
    "version": "1.0.0",
    "port": 3000
  }
  

index.js

  
  const loadJsonFile = require('load-json-file');
  
  loadJsonFile('config.json').then(config => {
      console.log(\`App Name: \${config.appName}\`);
      console.log(\`Version: \${config.version}\`);
      console.log(\`Port: \${config.port}\`);
  }).catch(error => {
      console.error('Could not load config:', error);
  });
  

With this guide, you should have a solid understanding of how to use the load-json-file package in your own projects, handling both simple and complex cases.