JSON stands for JavaScript Object Notation and it is a data-interchange format that is used for storing and exchanging information. It is more lightweight than the traditional XML format and is even used to send data across the internet from a web server. JSON developers are experts in understanding the syntax of this technology, but also in designing and coding up solutions for a wide range of problems for clients. JSON developers have an essential role in developing a variety of applications such as databases, websites and server-side applications.

Here's some projects that our expert JSON Developers made real:

  • Troubleshooting and creating scripts to transfer data through JSON into webpages
  • Developing modules to integrate dynamic solutions with transport APIs
  • Writing scripts using PHP, Java or Python to store, read and update databases
  • Building search result interfaces or flight search results
  • Connecting websites with local servers using JSON solutions
  • Providing solutions to scrape data from various sites
  • Developing product bundling rules using Dynamic Discounts in eCommerce platforms
  • Automating AWS documents involving sending emails with all outputs with SSM Document
  • Creating PowerShell scripts to convert data to CSV from an API

Overall, hiring a skilled JSON developer can enable businesses to harness the power of a wide range of web solutions — from report automation scripts, eCommerce shopping rules to flight search result interfaces — that be customised for any application or platform. With the help of Freelancer Platform, clients can find experienced and reliable professionals that have collaborated with businesses globally. With access to experts in the field, businesses can rest assured that their projects are being handled by specialized professionals that are well versed with this technology. We invite you to post your project on Freelancer Platform so you can find the most suitable professional for your needs.

From 134,447 reviews, clients rate our JSON Developers 4.9 out of 5 stars.
Hire JSON Developers

JSON stands for JavaScript Object Notation and it is a data-interchange format that is used for storing and exchanging information. It is more lightweight than the traditional XML format and is even used to send data across the internet from a web server. JSON developers are experts in understanding the syntax of this technology, but also in designing and coding up solutions for a wide range of problems for clients. JSON developers have an essential role in developing a variety of applications such as databases, websites and server-side applications.

Here's some projects that our expert JSON Developers made real:

  • Troubleshooting and creating scripts to transfer data through JSON into webpages
  • Developing modules to integrate dynamic solutions with transport APIs
  • Writing scripts using PHP, Java or Python to store, read and update databases
  • Building search result interfaces or flight search results
  • Connecting websites with local servers using JSON solutions
  • Providing solutions to scrape data from various sites
  • Developing product bundling rules using Dynamic Discounts in eCommerce platforms
  • Automating AWS documents involving sending emails with all outputs with SSM Document
  • Creating PowerShell scripts to convert data to CSV from an API

Overall, hiring a skilled JSON developer can enable businesses to harness the power of a wide range of web solutions — from report automation scripts, eCommerce shopping rules to flight search result interfaces — that be customised for any application or platform. With the help of Freelancer Platform, clients can find experienced and reliable professionals that have collaborated with businesses globally. With access to experts in the field, businesses can rest assured that their projects are being handled by specialized professionals that are well versed with this technology. We invite you to post your project on Freelancer Platform so you can find the most suitable professional for your needs.

From 134,447 reviews, clients rate our JSON Developers 4.9 out of 5 stars.
Hire JSON Developers

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    27 jobs found

    I’m looking for a developer who can take my nearly-finished back end and turn it into a polished, modern-and-clean web experience (desktop first). The heavy lifting on data is done: a structured JSON store already matches every major mortgage servicer to the exact documents, phone numbers, and process quirks a borrower needs. I can also share a working Claude project that demonstrates the logic flow, so you’ll start with clear reference material rather than a blank page. What I still need is the front-end and finishing glue: • Mortgage-detail form that validates basic loan data on the fly • Instant on-screen result that tells the user whether they can cancel PMI right now, or why not • A short guided assessment for edge cases, walking the borrower throug...

    $32 / hr Average bid
    NDA
    $32 / hr Avg Bid
    70 bids
    Quarterly Product Data Scrape
    6 days left
    Verified

    Regular comprehensive snapshot. There are 3,000 products. 20 columns for each product. Page by page. I’m looking for a repeatable, fully automated workflow. A Python-based stack (Scrapy, BeautifulSoup, Selenium, Playwright, or an equivalent you prefer). Robustness is key: the crawler should cope with pagination, JavaScript-rendered. Clear, well-commented code is part of the deliverable so my team can review and rerun it internally. Each quarterly hand-off must include: • Cleaned CSV or JSON containing the structured product records • The raw HTML or a compressed WARC snapshot for auditing • The executable script(s) plus a brief change log highlighting any site-structure updates you handled Please outline your proposed tool chain, an example of a large scrape yo...

    $184 Average bid
    $184 Avg Bid
    114 bids

    I already have a fully-built Node.js project (Apostrophe 3 CMS, v 4.8.0) zipped and ready to go. All I need is a smooth deployment to my Hostinger Business Node.js plan so the site becomes publicly accessible on my domain, no code changes, no feature tweaks. Key context • Node version on the server is 22. • Auto-deploy won’t work with ApostropheCMS, so it must be set up as a custom Node.js app. • I do not have SSH enabled on the account. Instead, I can upload through Hostinger’s File Manager and am looking for an alternative workflow that accomplishes the same npm install → npm run build → npm run prod sequence. The archive you’ll receive already contains , package files, all modules, views, public assets, scripts and ; node_modules is i...

    $59 Average bid
    $59 Avg Bid
    89 bids

    I’m rolling out a new rewards programme and need fully-functional loyalty cards for both Apple Wallet and Google Wallet. You’ll work inside my active Apple Developer and Google Developer accounts, handle certificate signing, and push everything live. Design help required I don’t have production-ready artwork yet, so I’ll rely on you to translate our brand guidelines into a clean, compliant layout. The pass must feature our logo, brand colours and a scannable QR code; please advise on field hierarchy, background contrast and barcode best practices so the card feels native on iOS and Android. Deliverables • Signed Apple Wallet .pkpass ready for distribution • Google Wallet loyalty JSON and assets, uploaded and visible in my console • Editable ...

    $100 Average bid
    $100 Avg Bid
    57 bids

    2️⃣ Browser Automation & UI Integration Developer We are looking for a developer to help connect browser automation with an existing system UI. The system has already been built by another developer, so the work mainly involves reviewing existing code and connecting components rather than building everything from scratch. Tasks may include reviewing Playwright-based browser automation scripts, making small modifications if needed, and connecting them with the existing system UI or automation flow. Some small adjustments to Chrome Extension scripts may also be add grok The system structure is documented in Notion. Work should be performed by comparing the Notion documentation with the actual implementation step-by-step to identify missing connections or adjustments. JSON files and c...

    $462 Average bid
    $462 Avg Bid
    105 bids

    LeadExec API Integration Developer (Lead Posting, Ping/Post, Call Leads) We are looking for an experienced backend/API developer to implement a full LeadExec lead receiver integration. This is not a basic webhook job. You must have real experience with lead distribution platforms, ping/post logic, and handling async responses, offers, and delivery status. Experience needed with the following software: 1. 2. 3. You will integrate multiple LeadExec endpoints including: - Standard lead submission - Ping > Post (Inbound PING & Inbound Post) - Call leads & call transfer leads - Offer handling (1-to-1 consent) - Duplicate checks - Lead status & delivery results - Offer acceptance callbacks Scope of Work: - Implement LeadExec v2 API endpoints: /v2/insert/general, /v2/insert/...

    $9 / hr Average bid
    $9 / hr Avg Bid
    68 bids

    I’m working on a project with the AVR-IoT Cellular Mini (Sequans Monarch 2 modem), where I modified the Arduino-based firmware myself to periodically transmit GPS latitude and longitude data to my backend (BE) over HTTPS. The objective is to send GPS data (latitude, longitude, and timestamp) to a REST API endpoint at a defined interval and confirm that the data is successfully received and visible on the backend. At the moment, I’m blocked by a TLS issue while attempting to configure the CA certificate for HTTPS. When I try to add the root CA certificate (ISRG Root X1 – Let’s Encrypt) to the device/modem, I get an error that says: “CA certificate input too long” Because of this issue: • The TLS handshake fails. • The HTTPS request does no...

    $18 Average bid
    $18 Avg Bid
    9 bids

    Vision This is an education technology platform focused on improving MCAT CARS performance through efficient content delivery and intelligent processing. This project is the first step toward a larger system. The goal is to build a simple, clean, single‑page prototype that accepts a URL, sends it to a backend endpoint, processes the content, and displays the extracted text on the same page. This prototype will be used to validate core functionality before expanding into a full product. Project Overview Build a minimal, production‑ready single‑page web application with one input field for a URL and a content display area that updates dynamically based on backend output. The backend will fetch the URL, extract readable text, and return it as JSON. The frontend will display the returned co...

    $742 Average bid
    $742 Avg Bid
    179 bids

    I need a Node JS service that pulls every piece of live information available on and its Android app (). The feed must refresh virtually every second, covering scores and statistics, detailed player profiles, and full match schedules. Your code should expose the data through robust JSON endpoints while respecting the target platform’s structure. Alongside the scraper, build a lightweight admin panel where I can: • Whitelist or block consuming domains / mobile apps in real time • View scrape and API-access logs at a glance • Add, edit or disable user accounts, assigning granular access rights Please design the solution so it can scale gracefully, use common Node JS tooling (TypeScript, Express, Puppeteer, Cheerio, or similar), and keep response latency low enoug...

    $67 Average bid
    $67 Avg Bid
    22 bids
    n8n IMAP PDF Forwarder
    3 days left
    Verified

    I need a straightforward n8n workflow that connects to my custom-hosted IMAP mailbox, polls the INBOX once every 24 hours, and processes only the messages that arrived since the last run. Here is exactly what the workflow must do: • Authenticate to the IMAP account (non-Gmail, custom server) and fetch only unseen emails. • Inspect each message for file attachments and determine whether at least one genuine PDF file is present. Ignore logos, signature images, embedded graphics, or any attachment that is not a PDF. • When one or more PDFs are detected, forward the email to a fixed destination address in plain-text format, preserving: – the original subject line – the email body converted to plain text – every PDF attachment found (if there...

    $39 Average bid
    $39 Avg Bid
    73 bids

    I am looking for a developer with real experience working with MapStore. My platform already runs on Linux with PostgreSQL, PostGIS, GeoServer and MapStore. MapStore already includes MapFish Print as the printing engine. The goal of this task is not installing the whole system, but developing and configuring a custom print template in MapStore to generate PDF reports. Users of the platform can already: Log in to the system Filter records in a table Visualize the geometry of the selected record on the map Based on that selected record, the system should generate a structured PDF report. The report should include: Header / title section Attribute information from PostgreSQL/PostGIS A small table with indicators A map showing the selected geometry The PDF must be generated using MapFish ...

    $34 / hr Average bid
    NDA
    $34 / hr Avg Bid
    46 bids

    Job Title: macOS App Data Extraction Specialist (Offline QBank – Reverse Engineering Required) Job Description: We are seeking an experienced freelancer with expertise in macOS application data analysis and reverse engineering to help extract offline data from a medical QBank application installed on macOS. The application allows users to download question banks for offline use, and the required data already exists locally within the app’s container directory on the Mac. However, the storage format appears to use a browser-style database system (e.g., IndexedDB/LevelDB) rather than a traditional SQLite database. Your task will be to analyze the application’s local storage structure and extract the stored QBank content into a clean, structured dataset. Scope of Work: Analy...

    $173 Average bid
    $173 Avg Bid
    19 bids

    I’m building a small web-tool that renders marketing pieces through , so I need clean, minimalistic templates delivered as Fabric.js-ready JSON files: Both pieces should focus on presenting our product details clearly and walking the reader through basic usage instructions—nothing sales-heavy, no visual clutter. I will supply logo, brand colours, and the exact text once we start; your job is to translate that content into an understated, balanced layout, then export each canvas as valid JSON along with a PDF/PNG preview so I can see the final look. Acceptance check: if I can drop your JSON into my instance and it renders pixel-perfect without errors, the task is complete. Please let me know how soon you can turn these around and what assets you’ll need from me straigh...

    $117 Average bid
    $117 Avg Bid
    106 bids

    I need an experienced .NET and Blazor developer who can give my product a full-time focus—eight hours a day ,starting asap —while working side-by-side with my lead engineer during Indian Standard Time. The codebase is already in production; our goal over the coming weeks is to tidy up rough edges, harden performance, and keep new issues from sneaking in as we roll out incremental updates. Tech stack you’ll touch daily: ASP.NET Core APIs, a Blazor front end that leans on hooks and functional components, JSON-heavy data exchange, and Azure resources provisioned with Bicep. You’ll be handling pull requests, writing clean commits, and jumping on quick Teams or Slack calls whenever a change needs clarification. Expect a straightforward workflow—branch, code, PR, r...

    $644 Average bid
    $644 Avg Bid
    73 bids

    I need an Android app that takes photo of invoice and automatically pulls out the key data I care about: • Invoice number • Total amount • Sender and receiver details • All article/line items A simple, clean UI is fine—one button to select or upload the invoice photo or click a photo and a results screen that displays the extracted fields. Storing the parsed data in some database will make it easy for me to feed the information into other systems later, so please include that. You are free to use any reliable parsing library as long as it runs smoothly on recent Android versions. The final deliverable should include: 1. The compiled APK for quick testing on my phone. 2. Full, well-commented source code that builds in Android Studio. Acceptance cri...

    $134 Average bid
    $134 Avg Bid
    29 bids

    I need an Android app that takes photo of invoice and automatically pulls out the key data I care about: • Invoice number • Total amount • Sender and receiver details • All article/line items A simple, clean UI is fine—one button to select or upload the invoice photo or click a photo and a results screen that displays the extracted fields. Storing the parsed data in some database will make it easy for me to feed the information into other systems later, so please include that. You are free to use any reliable parsing library as long as it runs smoothly on recent Android versions. The final deliverable should include: 1. The compiled APK for quick testing on my phone. 2. Full, well-commented source code that builds in Android Studio. Acceptance cri...

    $10 / hr Average bid
    $10 / hr Avg Bid
    59 bids
    Invoice OCR Automation
    1 day left
    Verified

    I receive batches of pdf or image invoices and need every piece of information they contain—dates, times, invoice numbers, totals, supplier details, line items, taxes—pulled out accurately and dropped into my existing JSON template. The field names in the template match the text on the invoices, so your job is to locate each value with OCR and map it straight into the corresponding key; if a value is missing, leave the field blank rather than guessing. Any reliable stack is acceptable. Python with Tesseract, EasyOCR, Google Vision, or a comparable engine will work as long as the final script is easy for me to install and modify. Reliability and clean code matter more than raw speed. Deliverables • A runnable script or notebook that ingests JPEG invoices and produces JSON...

    $554 Average bid
    $554 Avg Bid
    99 bids

    I want a lightweight program-level solution (no mobile app) that lets visitors browse my online menu and send their order straight to my WhatsApp number. When the customer taps “Order”, the system should automatically compile their selected items, quantities, and total and open WhatsApp (web or mobile) with that information pre-filled in the chat. I then receive the message exactly as if they had typed it themselves, ready for confirmation and payment. Key points • Works from any modern browser; no app download for users. • Clean, responsive menu interface: items, prices, optional images, and quantity selectors. • Real-time calculation of subtotal and total. • One-click hand-off to WhatsApp using universal deep-linking () so it functions on iOS, And...

    $469 Average bid
    $469 Avg Bid
    164 bids

    I am looking for a developer to help build a REST API using PHP that interacts with a MySQL database containing information about an academic conference (presentations, authors, and presentation types). The API should be structured and follow good software architecture practices. It will include endpoints to retrieve and manage data such as authors, presentations, and presentation types. The API should return responses in JSON format, support HTTP methods (GET, POST, PATCH, PUT, DELETE) where appropriate, and follow RESTful design principles. Key requirements include: PHP-based REST API (no frameworks) Integration with an existing MySQL database Clean, well-structured code Input validation and secure database queries Pagination support for large datasets Clear API endpoints for aut...

    $76 Average bid
    $76 Avg Bid
    72 bids

    I need a small, self-contained resource pack for Minecraft Java Edition that will be used on a Fabric server. Very important: This project must NOT use OptiFine, Custom Item Textures (CIT), or any client-side mods. I want this to work using vanilla mechanics only. The goal is to replace the standard carved pumpkin model with several alternate 3D fantasy-style models (for example: a long wizard’s hat, a trophy helm, and other creative variants). Players should be able to switch between these models simply by renaming the carved pumpkin in an anvil. No OptiFine, no CIT Resewn, and no external mod dependencies should be required. The solution must rely purely on vanilla-compatible resource pack features. This pack is focused and lightweight. I only need: Custom textures Custom 3D ...

    $56 Average bid
    $56 Avg Bid
    11 bids

    I have 100 distinct locations that I need plotted on a single web page using the Google Maps JavaScript API. Down the left-hand side I want a clean, scrollable sidebar that automatically arranges every place into its correct category, so users can jump straight to any group and see the matching markers highlighted on the map. When a visitor clicks a marker (or a name in the sidebar), an info window should open showing: • Location name • A brief, rich-text description or notes Everything must load quickly and work on desktop and mobile. Feel free to structure the data in JSON or any format you find easiest to maintain; I simply need clear instructions on how to add, edit, or remove entries later. Deliver the finished, fully commented HTML/CSS/JS files so I can drop them ...

    $67 Average bid
    $67 Avg Bid
    22 bids

    Project Overview We are developing a sophisticated "Quad-Agent" AI infrastructure designed to automate the transition of raw client data into structured, auditable compliance and impact reports. Our ecosystem relies on a seamless data loop between HubSpot (CRM), Google Gemini (AI Agents), and AppSheet (User Interface). I am looking for an AI Workflow Engineer to finalize our "System Instructions" and build the technical bridge that ensures data integrity as it moves through our four specialized AI agents. Scope of Work - Multi-Agent Orchestration: Optimize the "System Instructions" for 4 distinct Gemini-based agents (Librarian, Compliance, Communications, and Analyst) to ensure consistent data hand-offs. - HubSpot Integration: Map CRM properties to AI prompt...

    $24 / hr Average bid
    $24 / hr Avg Bid
    107 bids

    I need an API to output data to a daily Excel spreadsheet. The API should support JSON format. Key requirements: - Daily updates - JSON format for data output - Secure and efficient data transfer Ideal skills: - Experience with API development - Proficiency in handling Excel and JSON - Knowledge of data security practices Looking for a skilled developer to automate this process. Please provide relevant experience in your bid.

    $52 / hr Average bid
    $52 / hr Avg Bid
    73 bids

    Hi, I need help with an automation assignment. Here’s the brief: I need to build a zero-cost automation pipeline that: 1️⃣ Takes a demo call transcript/recording and: Extracts structured account data (JSON format) Generates a preliminary Retell agent configuration (prompt + routing rules) Stores versioned outputs (v1) Creates a tracking item (like in Asana or free alternative) 2️⃣ Takes an onboarding call transcript/recording and: Updates the same account (v2) Generates updated JSON + updated agent spec Produces a clear changelog showing what changed Constraints: Strictly zero cost (free-tier tools only) Fully reproducible Must run on 5 demo + 5 onboarding calls No paid LLM APIs If Retell API isn’t free, generate a Retell Agent Spec JSON instead Required Output...

    $21 Average bid
    $21 Avg Bid
    15 bids

    We need experienced professional for Lotus Notes Web Developer with Strong Domino Administrator skills. Key Responsibilities: Domino Administration: Install, configure, and maintain IBM/HCL Domino servers. Manage Domino server upgrades, migrations, and patching. Monitor server performance, troubleshoot issues, and ensure high availability. Configure and manage replication, clustering, and mail routing. Implement and maintain security policies, user access controls, and certificates. Perform backup and disaster recovery planning. Manage user provisioning, group policies, and mail databases. Ensure system compliance and data integrity. Lotus Notes / Domino Development: Design, develop, and maintain Lotus Notes/Domino applications. Develop web-enabled Domino applications using: Domino Desig...

    $430 Average bid
    $430 Avg Bid
    77 bids

    Busco gente que contrate para crear plugin de juego totalmente funcional, compatible tanto con PocketMine-MP5 como con PocketMine-MP2. El objetivo es ofrecer a los jugadores una experiencia dinámica que combine: • Sistema completo de puntos de experiencia que se guarde y cargue sin errores. • Misiones/Quests configurables (recompensas, objetivos, texto de historia). • Varios mini-juegos integrados o fácilmente añadibles mediante YAML/JSON. Requisitos técnicos y de entrega 1. Código limpio en PHP, siguiendo las prácticas recomendadas de PocketMine. 2. Estructura de carpetas estándar (src, resources, lang, etc.). 3. Archivos de configuración con ejemplos comentados. 4. Compatibilidad probada en servidores ...

    $25 Average bid
    $25 Avg Bid
    12 bids

    Buscamos un desarrollador Full-Stack (o equipo) senior para el desarrollo de las aplicaciones móviles nativas (iOS y Android) de nuestra herramienta TheCampus. El proyecto consiste en replicar la funcionalidad y lógica de nuestra plataforma web (Angular), integrándola con un backend robusto ya existente en Firebase. Stack Tecnológico Requerido (Imprescindible) iOS: SwiftUI (Arquitectura MVVM). Android: Kotlin (Jetpack Compose). Backend: Firebase Cloud Functions (Desarrolladas en Node.js con Express). Database: Firebase Firestore. Networking: Dominio de consumo de APIs REST (JSON/HTTP). Auth: Firebase Authentication (Flujo híbrido: SSO y Usuario/Contraseña). Referencia: Angular (para interpretar la lógica de negocio actual). Detalles ...

    $3931 Average bid
    $3931 Avg Bid
    53 bids

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