Hire the Best JSON Developers

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Rating is 4.8 out of 5.
4.8/5
Based on 1,934 client reviews
Priyanshu R.

Indore, India

$25/hr
4.9
693 jobs

I create lightweight, interactive Lottie and Rive animations for SaaS products and mobile apps. 600+ projects delivered. From splash screens to complex state-machine UIs — I ship production-ready .json and .riv files that developers. Top Rated on Upwork | Top 10% | Trusted by 600+ clients across North America, Europe, and Asia. Whether you need a crisp app onboarding animation or a compelling explainer video that drives conversions — I bring both the motion design expertise and the storytelling instinct to make it land. Clients include Toyota, Vivo, Somany Bathware, and 600+ SaaS, fintech, e-commerce, and ed-tech teams. What I Create ⚡ Lottie Animation — Lightweight, dev-ready Lottie JSON files for web and mobile apps. I create onboarding flows, loading animations, micro-interactions, UI state transitions, empty-state illustrations, success/error feedback animations, and in-app storytelling sequences. Every file is optimized for size and performance — typically under 50KB — and tested across platforms before delivery. 🎮 Rive Animation — Interactive Rive components and character animations with real-time state machines. I build toggle animations, interactive buttons, animated icons, onboarding characters, and gamified UI elements that respond to user input. Built for performance, designed for seamless developer handoff with clean state machine architecture. 🎬 Explainer Videos — Script-to-screen explainer videos for SaaS, fintech, healthcare, and product launches. I handle concept development, scriptwriting support, storyboarding, illustration, voiceover direction, and final animation. Every video is designed to simplify complex ideas, increase landing page conversions, and reduce customer support load. Styles include 2D character animation, flat design motion graphics, whiteboard animation, and isometric explainer videos. 🎨 Motion Graphics & After Effects — Logo reveals, brand intros/outros, social media video ads, product launch teasers, event promos, animated infographics, and kinetic typography. Whether it's a 5-second logo sting or a 90-second ad campaign, I match your brand guidelines and deliver broadcast-quality motion design. 📱 UI/UX Animation & Prototyping — App transition animations, navigation flows, scroll-triggered effects, and interactive prototypes. I bridge the gap between design and development by creating animations that developers can implement pixel-perfectly using Lottie, Rive, or CSS/SVG specs. Industries I Work With I've delivered animation projects across SaaS, fintech, e-commerce, ed-tech, healthcare, real estate, logistics, cybersecurity, HR tech, and consumer brands. This cross-industry experience means I understand how to communicate complex workflows, technical products, and abstract services visually. My Process — Built for Async, Remote Teams 1. Discovery & Concept Alignment — I review your brief, ask targeted questions, and define the creative direction, audience, and goals before any design work begins. 2. Script & Storyboard — For explainer videos, I collaborate on the script or write from scratch, then deliver an illustrated storyboard for approval. For UI animations, I share motion briefs or style frames. 3. Animation Production — I animate in After Effects, Rive, or directly for Lottie export depending on the deliverable. You'll see progress at key checkpoints — no surprises at the end. 4. Feedback & Revisions — Structured revision rounds with clear communication. I respond to feedback within 0–4 hours during working days. 5. Final Delivery — Production-ready files delivered in the format your team needs: Lottie JSON, Rive files, After Effects projects, MP4, MOV, GIF, or WebM. All assets are optimized for fast loading, smooth playback, and easy integration. Tools & Technical Stack Adobe After Effects, Bodymovin/Lottie, Rive (with state machines), Adobe Illustrator, Spline, Photoshop, Audition. I'm comfortable working alongside developers using React, Flutter, Swift, and Kotlin — and I ensure every animation file integrates cleanly into your existing tech stack. Why Clients Keep Coming Back → I don't just animate — I think about why something moves. Every animation serves a purpose: guiding attention, simplifying a concept, increasing engagement, or driving a specific user action. → I communicate clearly and proactively. You'll never have to chase me for updates. → I deliver on time, every time. Deadlines are non-negotiable for me. → I optimize for the real world — file size, load time, cross-platform compatibility, and developer handoff are part of my standard process, not afterthoughts. 📩 Send me your project brief — I'll respond with a clear plan, timeline, and estimate within 4 hours. My Expertise: Lottie Animation, Rive Animation, Motion Graphic Design, UI Animation, Motion Design, Gif, SVG Animation, Explainer Videos, SaaS Animated Videos, Onboarding animation, Icon Animation

  • JSON
  • Lottie
  • GIF
  • SVG
  • UI Animation
  • Motion Design
  • Motion Graphics
  • Interactive Design
  • Animated GIF Design
  • Animated GIF
  • Character Animation
  • Adobe After Effects
  • 2D Animation
  • Interaction Design
  • Splash Screen
  • Interactive Prototype
  • Animated Explainer
  • Video Production
  • Explainer Video
  • Mobile App Design
Haris A.

Karachi, Pakistan

$40/hr
5.0
54 jobs

Most projects I'm hired for now start the same way: something already exists, it demos beautifully, and it won't survive a real user. Six years on Upwork, 50+ contracts, 100% JSS. I use AI tooling daily — it's genuinely fast at producing something that runs. What it doesn't produce is a system. It'll happily put an API key in the frontend, skip the empty state, ignore the error case, invent an auth check that runs client-side only, and duplicate the same logic across nine files. None of that shows up in the demo. All of it shows up in week one of real traffic. So a lot of my work now is picking up prototypes and making them into products. Not rewriting from scratch — that's usually wasteful, and the prototype already proved the idea. The job is finding the handful of decisions that will break under load and fixing those, then building properly on top of what's worth keeping. I do greenfield builds too. But if you've got something half-finished, inherited from another developer, or generated fast and now stuck, that's the situation I'm most useful in. What I actually do first I read the code and the real data before I quote. Not the docs — the actual API responses, the actual database, the actual repo. Documentation describes intent; the data tells you what's true, and the gap between them is where timelines vanish. Then you get a straight assessment: what's fine, what's fragile, what's dangerous, and what any of it costs. Sometimes the answer is that less needs fixing than you feared. I'd rather tell you that in the first conversation than bill for it. What I build React, TypeScript, Next.js on the front. Node and Python behind it. Dashboards, client portals, marketplaces, booking systems, internal tools. Heavy on integration — connecting a frontend to an API that already exists, third-party services, systems never designed to talk to each other. Auth and role-based access done server-side, where it can't be bypassed. AI features where they earn their place. I'm also a data engineer, Microsoft Fabric certified (DP-600, DP-700), building pipelines and Power BI reporting on Azure and AWS. That's why my applications hold up under real data: most developers guess at what arrives downstream. I've been the one generating it. How I work Working URL early, stays working. Progress is something you check, not something I report. Scope changes raised the week I spot them, not at handover. Written for whoever maintains it after me, assuming it won't be me. Your repo, your server, docs covering build, deploy, and rollback. Track record "The best freelance developer I have EVER worked with." · "Built the MVP I was looking for in record time." Send me the repo or a real API response, and I'll tell you what you're dealing with before either of us commits.

  • JSON
  • JavaScript
  • TypeScript
  • React
  • Next.js
  • API Integration
  • SQL
  • Python
  • Data Analysis
  • Microsoft Power BI
  • ETL Pipeline
  • Supabase
  • AI Development
  • AI Chatbot
  • Claude
  • Vercel
  • GitHub
  • API
  • Serverless Stack
  • Replit
Pasindu P.

Ruwanwella, Sri Lanka

$18/hr
5.0
10 jobs

I've generated over $1M+ in revenue for clients through SaaS platforms and Chrome Extensions. I've also solved complex automation challenges where 20+ developers previously failed. With 150+ clients served and 250+ projects shipped, I build production-ready software that delivers real business results. 🚀 Core Expertise: • Full-Stack SaaS Development: End-to-end web apps (MERN, AWS) built for scale and MVP launch. • Chrome Extension Developer: Manifest V3 compliant extensions with 100% Chrome Web Store Approval Rate. • AI & Automation: Integrating OpenAI, Gemini, and custom agents to automate complex tasks. • Workflow Automation: Streamlining processes on LinkedIn, Zillow, CRMs, and internal tools. • Web Scraping & Data: Reliable data extraction with advanced anti-bot bypass. • Any browser script or Google AppScript 🏆 Featured Projects & Client Wins: • SuperX (Twitter/X Analytics): Built full-stack SaaS generating $1M+ revenue for client, 10,000+ users. • SuperDev Pro: Developer tools extension with 20,000+ users, 50+ integrated tools in one sidebar. • NoCode Web Scraper: Full-stack SaaS + Chrome extension for structured data collection, CSV/JSON/Excel export pipelines. • AI ATS & Job Auto Apply: Solved complex automation challenges where 20+ developers previously failed, enabling seamless job application workflows. • Amazon Automation Suite: 6+ extensions including Shift Sniper, Hiring Automation, Real-Time Slot Tracker, CAPTCHA Auto-Recovery. (50+ devs failed on this) • AI-Powered Dashboard: Extension + backend with real-time data sync and custom AI integrations. 💎 Why Clients Choose Me: • Business-First Mindset: I focus on API costs, user retention, and ROI. • Store-Ready Code: Built with Google's strict security policies for instant approval. • Clear Communication: Technical solutions explained in simple English. 🛠️ Tech Stack: • Full-Stack (MERN): MongoDB, Express.js, React, Next.js, Node.js, TypeScript. • Cloud & DevOps: AWS (EC2, S3, Lambda), Docker, CI/CD, Git, GitHub. • Databases: Firebase, Supabase, PostgreSQL, Redis, MongoDB. • Frontend: React, Next.js, TypeScript, Tailwind CSS, HTML5, CSS3, Redux. • AI & Automation: OpenAI API, Google Gemini, LangChain, Browser Automation, Web Scraping. • Integrations: Zapier, Make, REST APIs, GraphQL, Webhooks. 📂 Featured Projects: My portfolio includes 250+ delivered extensions and multiple SaaS products. View my project catalog for case studies on Manifest V3 migration, AI integrations, automation, and full-stack builds. Ready to launch? Message me with your idea. I will provide a 5-minute technical breakdown and a realistic timeline for your build today. 👉 Let's build a tool that actually works.

  • JavaScript
  • React
  • Next.js
  • HTML
  • Google Chrome Extension
  • Browser Extension
  • Full-Stack Development
  • AI Development
  • OpenAI API
  • API
  • Google Apps Script
  • API Development
  • AI App Development
  • Google APIs
  • SaaS Development
  • AI Model Integration
  • REST API
  • Extension & Module Development
  • Browser Automation
  • Chrome OS
Sergey Y.

Shymkent, Kazakhstan

$15/hr
5.0
86 jobs

I've spent 7+ years building and rescuing WordPress/WooCommerce sites — over $200K earned on Upwork alone, 84 completed jobs, Top Rated Plus, and client relationships that have lasted 5+ years. I build custom themes and plugins from scratch, migrate legacy sites, convert Figma/HTML designs into fully functional WordPress builds, and fix what previous developers left broken — including taking over and forking other developers' plugins. What I do: • Build custom WordPress themes and plugins, from scratch or by taking over/forking existing code • Convert Figma designs and static HTML into responsive, mobile-first WordPress/WooCommerce sites • Diagnose and fix theme/plugin bugs other developers couldn't solve • Integrate third-party tools — payments, CRMs, analytics, custom APIs • Optimize for performance, SEO, and cross-browser compatibility Tools: WordPress, WooCommerce, ACF, Elementor, PHP/MySQL, JavaScript/jQuery, HTML5/CSS3/SCSS, Git, REST APIs Currently expanding into headless WordPress architecture (React/Next.js) and AI-integrated features, so I can build faster, more scalable front-ends on top of the WordPress backends clients already trust — while keeping the reliability that got me these long-term relationships. If you need a WordPress site built right the first time, or fixed by someone who won't need hand-holding, let's talk.

  • HTML
  • CSS
  • SCSS
  • JavaScript
  • jQuery
  • WordPress
  • WooCommerce
  • JSON API
  • API Integration
  • PHP
  • PSD to HTML
  • Sass
  • HTML5
  • CSS 3
Ary P.

Jakarta, Indonesia

$20/hr
5.0
14 jobs

I have over 20 years of experience in designing & building websites & applications for startups, small to large companies. I have successfully delivered over 50 projects for clients across various industries. I love mentoring, coaching & workshop for my team mates & other developers. I share my knowledge and expertise through StackOverflow and other platforms. I believe that the more we share our knowledge with others, the more knowledge we will get. If you are looking for a reliable, creative, and passionate fullstack software engineer who can help you turn your ideas into reality, let’s connect! 😊

  • JSON
  • Microsoft Windows PowerShell
  • JavaScript
  • PHP
  • jQuery
  • WordPress
  • CSS 3
  • MySQL
  • SQL Programming
  • Responsive Design
  • Responsive Design Testing
  • Web Application
  • HTML5
  • C#
Adnan S.

Betul, India

$15/hr
4.7
448 jobs

👋 Helping Shopify & Shopify Plus brands build, optimize, and scale high-performing eCommerce stores for over 10 years. 🏆 Top Rated Plus | ⭐ 98% Job Success | ⏱️ 19,800+ Hours | ✅ 400 Successful Projects I specialize in Shopify Plus, Custom Theme Development, Shopify Apps, API Integrations, CRO, Performance Optimization, AI-powered Solutions, and eCommerce Automation that help businesses increase conversions, improve customer experience, and streamline operations. From startups launching their first Shopify store to established brands scaling with Shopify Plus, I deliver clean, scalable solutions with long-term business value. Whether you need a custom Shopify app, advanced integrations, store optimization, or a dedicated technical partner, I'm here to help. 💬 Let's build something amazing together.

  • Shopify Theme
  • Shopify Templates
  • Shopify Apps
  • Shopify Plus
  • Shopify SEO
  • Shopify Marketing
  • Shopify Development
  • Shopify Dropshipping
  • Shopify Website Redesign
  • Set Up Shopify Site
  • API Development
  • Web Application
  • SEO Audit
  • Shopify
  • Shopify Website Design

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JSON FAQs

What is JSON?

JSON (JavaScript Object Notation) is a data interchange format that has vastly improved server-to-browser communications—especially when it comes to AJAX. It’s a language that’s similar to XML, syntactically identical to JavaScript code, and the fastest data-interchange format to be used with AJAX (Asynchronous JavaScript + XML), making it not far behind HTML when it comes to skills no front-end developer should go without.

JSON is a syntax designed to store and move data that’s sent between server and browser. It’s similar to a markup language in its syntax and how it’s used, but it’s not a markup language at its core. If you think of how XML functions in the scheme of a site—XML describes elements of data, while HTML displays that data—JSON does the same thing, just in a more streamlined way, both for the developer and the browser.

Why hire a JSON specialist?

A front-end developer who specialists in JSON can help you to create interactive, high-performance sites and apps. 

JSON was the first format that allowed servers and browsers to communicate without a browser plug-in like Flash or Java. But where JSON really shines—and sets the standard—is how it functions within AJAX operations. AJAX essentially allows parts of a web page to be updated without requiring a full-page refresh, something that vastly changed the way users interact with web applications. It immediately solved problems that were caused by limited bandwidth, prevented server overload, and kept things from slowing down in the app.

AJAX was originally created in the mid-2000s with XML as its data interchange format. In that first model, after a page was loaded, new data could be called up from the server using XML as the data interchange format. JSON has improved the data retrieval process by being front-end compatible by nature with its JavaScript roots. With JSON and JSON Web Services, AJAX runs faster—it’s instantaneous and highly efficient.

JSON’s core differentiator is that it’s written in JavaScript syntax, but it’s text-only. This allows it to logically skip a front-end step: Whereas XML requires a parser to be read by a JavaScript program, JSON doesn’t require any extra software. It’s a subset of JavaScript, and so it’s compatible with the front end, right off the bat. A JavaScript program will convert JSON elements directly into JavaScript objects.

Like XML, JSON:

  • Is “self-describing,” meaning humans can read it
  • Uses hierarchical values
  • Can be read by many programming languages
  • Is able to be “fetched” by an XMLHttpRequest

How JSON is different than XML:

  • Doesn’t require an end tag and won’t “break” without one
  • Is shorter to read and quicker to write
  • Uses arrays, which are logical ways to bulk similar data formats in an element