---
title: "Discussion on \"How to Defend Your JavaScript App Against Unsafe Data with TypeScript Guard Utilities\" | Hashnode"
description: "Discussion on \"How to Defend Your JavaScript App Against Unsafe Data with TypeScript Guard Utilities\". Picture this: you hit an API endpoint, and you get an API response back. You pass the data straight into your application, and everything looks fine in development. Your mock data is clean, your types"
url: "https://hashnode.com/posts/defend-your-js-app-against-unsafe-data-with-typescript-guard-utilities/6a4576be7808ec6de20de8ff"
---

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# [How to Defend Your JavaScript App Against Unsafe Data with TypeScript Guard Utilities](https://freecodecamp.org/news/defend-your-js-app-against-unsafe-data-with-typescript-guard-utilities?utm_source=hashnode&utm_medium=feed)

Picture this: you hit an API endpoint, and you get an API response back. You pass the data straight into your application, and everything looks fine in development. Your mock data is clean, your types

Jul 1 · 15 min read · freecodecamp.org  
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## Written by

[Kelechi Apugo](https://hashnode.com/@Laviedegeorge)

@Laviedegeorge · Port Harcourt, Nigeria

  
[View profile](https://hashnode.com/@Laviedegeorge)

Front-end web engineer

I am a passionate Software Engineer with over five years of experience in crafting scalable, user-centred web applications. My focus is on frontend development, where I combine strong technical expertise with a product-oriented mindset to create reliable, intuitive, and high-performing digital solutions. I have extensive experience with React, Next.js, TypeScript, and many other tools for building solid applications and modern frontend architectures. I also prioritise testing and quality practices to ensure the long-term success of the projects I work on. Collaborating closely with designers, backend engineers, and product teams in Agile environments excites me, as I enjoy transforming complex ideas into clean, efficient solutions. Working with distributed teams is something I embrace; I value clear communication and take ownership of my work. I am always eager to enhance my technical skills and engineering practices. What motivates me most is building impactful software, contributing to mission-driven teams, and growing as an engineer while delivering meaningful outcomes for both the business and its users. I truly believe that together, we can achieve great things!

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