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.

จาก 133,949 รีวิว ลูกค้าให้คะแนน JSON Developers 4.9 จาก 5 ดาว
จ้าง 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.

จาก 133,949 รีวิว ลูกค้าให้คะแนน JSON Developers 4.9 จาก 5 ดาว
จ้าง JSON Developers

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    สถานะงาน
    26 งานที่พบ
    Trading Webhook Relay and CSV Logger
    6 วัน left
    ยืนยันแล้ว

    Build a small reliability-critical relay service between **TradingView webhook → SignalStack execution**. The service must: 1. Receive webhook JSON 2. Forward it unchanged to SignalStack 3. Log each event into an auto-growing CSV dataset (Excel-ready) 4. Prevent duplicate processing 5. Run continuously and safely (24/7 trading environment) This is infrastructure plumbing — not a trading bot, UI, or analytics system. Example Input ```json {"symbol":"CADH2026","quantity":1,"action":"buy","strategy_code":40217,"position_id":"40217_17022026_0600","bucket":"IW_LONG"} ``` Extra fields may appear and must not break forwarding. --- Requirements -Webhook Endpoint * POST `/webhook...

    $1105 Average bid
    $1105 การประมูลเฉลี่ย
    24 คำเสนอราคา
    Offline Digital Image Catalog Creation
    6 วัน left
    ยืนยันแล้ว

    Job Title: Power Apps & Azure Expert – High-Perf Offline Catalog (Intune Ready) Budget: $50 - 250 USD Payment: Milestone-based The Project I need a Power Apps solution for field teams to browse digital image catalogs with zero latency and 100% offline support. The app must be manageable via Microsoft Intune. Architecture & Data Structure Storage (SharePoint): Resources are organized by Region (Root folders). Each region contains multiple sub-folders, each representing a Catalog. Content: Each catalog contains 20-30 numbered JPG files (e.g., , ). Volume: ~30 catalogs per region, ~5MB per catalog (Total payload per region: ~150MB). Dynamic Monitoring: A Logic App must monitor every folder modification (add/delete/update) to keep the app synchronized in real-time by updatin...

    $182 Average bid
    $182 การประมูลเฉลี่ย
    55 คำเสนอราคา

    READ CAREFULLY OR DO NOT APPLY. We are building a dating product MVP and are preparing for launch. Multiple developers have worked on the project and the platform is currently unstable. We are not looking for feature development at this stage. We are looking for a senior engineer to conduct a structured codebase audit and deliver a clear MVP stabilization plan. Key Deliverables: System Overview: Architecture diagrams, stack summary, key integrations (focus on voice/video stability). Stability Findings: Prioritized bugs, technical debt, root causes from logs/deployments. Stabilization Plan: High-impact fixes with effort estimates, sprint roadmap for launch-ready MVP. Expert level only. Provide your approach and timeline in proposal. Start immediately.

    $9 / hr Average bid
    $9 / hr การประมูลเฉลี่ย
    114 คำเสนอราคา

    I’m building an early-stage B2B SaaS product (StrataOps) focused on workflow automation for property management companies. ​ For this MVP, I need a Python developer to build an AI-powered maintenance triage system that sits on top of a shared Gmail inbox. ​ The system should be able to: Monitor incoming maintenance emails from tenants and property managers in a shared Gmail inbox. ​ Classify each email into categories (e.g., HVAC, plumbing, electrical, general, etc.). ​ Detect urgency and basic priority based on rules and content. ​ Extract key structured fields (tenant details, property, problem type, severity, timing, etc.) into JSON. ​ Prepare draft replies for tenants, and suggestions for vendors or next actions. ​ The MVP will be delivered in two main phases: Core triag...

    $11 / hr Average bid
    $11 / hr การประมูลเฉลี่ย
    66 คำเสนอราคา
    Next.js REST API Integration
    5 วัน left
    ยืนยันแล้ว

    I need my existing app wired up to an existing external REST API so it can securely fetch data, submit updates, handle authentication, and allow users to upload files. Most endpoints accept/return JSON, and uploads are sent as multipart/form-data — your code must handle both cleanly and reliably. Deliverables: A small, reusable, well-typed API client layer (e.g., /lib/api or similar) using fetch or Axios Authentication integration (bearer tokens / OAuth details provided). Requests should be signed correctly and handled consistently across the app Example usage: at least one working flow for: data retrieval data submission login/session handling file upload (multipart/form-data) Robust error handling (including loading + failure states) and a short README explaining patterns...

    $18 / hr Average bid
    $18 / hr การประมูลเฉลี่ย
    277 คำเสนอราคา

    TallyPrime Sync Plugin Developer — TDL + REST API Integration Project Overview We are building a TallyPrime plugin (TDL with optional COM DLL) that synchronizes data bi-directionally between TallyPrime and our cloud-based system via REST APIs (JSON over HTTPS). We are seeking an experienced Tally developer with strong expertise in TDL and modern API integrations to implement a production-ready synchronization solution inside TallyPrime. Project Scope The plugin will run within TallyPrime and support the following capabilities: 1. Initial Data Migration On first setup, the plugin must export existing masters and recent transactions from Tally to our cloud system in batches. Requirements: Progress UI for real-time visibility Scope selection (Current Financial Year, Last N Months, ...

    $1213 Average bid
    $1213 การประมูลเฉลี่ย
    20 คำเสนอราคา

    OBJETIVO Necesito un programa externo (standalone) (preferiblemente Python) que reciba un archivo .wpress generado con All-in-One WP Migration, reescriba automáticamente todo el contenido con OpenAI para evitar duplicidad en Google manteniendo intención SEO y estructura, y genere un nuevo .wpress listo para importar en otro dominio con All-in-One WP Migration. El resultado debe mantener la web funcional y con la misma estructura visual, sin romper menús, cabecera/footer, builder (Divi/Elementor) ni la navegación. ⸻ ENTRADA / SALIDA (OBLIGATORIO) • Input: • Output: • El archivo de salida debe importarse correctamente con All-in-One WP Migration en un WordPress limpio. ⸻ OPENAI (OBLIGATORIO) Integración con la API oficial de OpenA...

    $183 Average bid
    $183 การประมูลเฉลี่ย
    30 คำเสนอราคา
    Automate TradingView-Zerodha Options -- 2
    4 วัน left
    ยืนยันแล้ว

    I already have clear Buy, Sell and Exit signals on TradingView and I need every one of those alerts to translate instantly into live options orders on my Zerodha Kite account. The entire flow has to be hands-free: TradingView fires the alert, a webhook or bridge interprets it, Kite Connect executes the corresponding Call or Put order, and I get a quick confirmation. My decisions are driven exclusively by technical analysis, so accuracy and latency matter more to me than heavy computation. The bridge must accept simple parameters embedded in the alert (symbol, strike, quantity, direction, exit) and push them to Zerodha without me touching the interface. Please include: • A small, secure middleware script or service (Python preferred) that parses the TradingView alert JSON. &b...

    $19 Average bid
    $19 การประมูลเฉลี่ย
    8 คำเสนอราคา
    Automate TradingView-Zerodha Options
    4 วัน left
    ยืนยันแล้ว

    I already have clear Buy, Sell and Exit signals on TradingView and I need every one of those alerts to translate instantly into live options orders on my Zerodha Kite account. The entire flow has to be hands-free: TradingView fires the alert, a webhook or bridge interprets it, Kite Connect executes the corresponding Call or Put order, and I get a quick confirmation. My decisions are driven exclusively by technical analysis, so accuracy and latency matter more to me than heavy computation. The bridge must accept simple parameters embedded in the alert (symbol, strike, quantity, direction, exit) and push them to Zerodha without me touching the interface. Please include: • A small, secure middleware script or service (Python preferred) that parses the TradingView alert JSON. &b...

    $22 Average bid
    $22 การประมูลเฉลี่ย
    6 คำเสนอราคา

    Looking for a React/ developer to build a personal productivity dashboard as a PWA. This is frontend only. The app uses mock JSON data for now and will connect to a live API later. You do not need to build any backend. THE APP: Clean, modern interface. Dark sidebar navigation on the left, content area on the right. Dark mode and light mode. Responsive for desktop, tablet and mobile. 5 PAGES: 1. CHAT — Message list UI (user on right, reply on left). Text input at bottom. Conversation list in sidebar. Loads from mock JSON. 2. EMAIL — Inbox list with sender, subject, date. Click to read. Compose button. Folder list (Inbox, Sent, Drafts). Loads from mock JSON. 3. FILES — Grid/list view toggle. Folders and files with icons. Click to navigate or preview (image, PDF, text...

    $24 / hr Average bid
    $24 / hr การประมูลเฉลี่ย
    186 คำเสนอราคา
    Node.js PDF Generator
    4 วัน left

    I need a clean, well-documented Node.js solution that fetches JSON data from a specified API endpoint and turns it into a professionally formatted PDF made up exclusively of tables. The flow is straightforward: call the API, parse the JSON payload, map the fields to table columns, then render each table so it paginates gracefully and, when necessary, repeats headers across pages. Key points • Source data arrives solely from an API in JSON format—no manual entry or secondary feeds. • The PDF contains tables only; no images or free-form text blocks beyond table headers or footers you may add for clarity. • Any solid, maintained library is fine—pdfkit, Puppeteer, jsPDF, or a comparable Node.js toolset—as long as it supports custom styling (borders, alte...

    $52 Average bid
    $52 การประมูลเฉลี่ย
    40 คำเสนอราคา
    FlutterFlow Frontend UI Logic & API Integration
    3 วัน left
    ยืนยันแล้ว

    FlutterFlow API Integration & UI Logic Wiring This project is strictly frontend logic wiring in FlutterFlow. Backend is already deployed on Railway and fully functional. All required APIs are live and returning 200 OK when tested. No backend changes are allowed. Tech Stack Frontend: FlutterFlow Backend: Existing REST APIs (already connected & tested) Method: POST Response format: JSON Screens & UI Elements (Already Created) Questionnaire page with inputs Q1 – Q10 “Submit Questionnaire” button Result page with Text Widget (output display) “Ask Any Question” input field “Ask” button Loading indicator widget Error display (Snackbar / Text) Tasks to Implement 1. Questionnaire Submission Flow Collect values from Q1–Q10 Combine them int...

    $19 Average bid
    $19 การประมูลเฉลี่ย
    22 คำเสนอราคา
    Trophy icon REST API & UI Integration in FlutterFlow
    1 วัน left

    FlutterFlow API Integration & UI Logic Wiring This project is strictly frontend logic wiring in FlutterFlow. Backend is already deployed on Railway and fully functional. All required APIs are live and returning 200 OK when tested. No backend changes are allowed. Tech Stack Frontend: FlutterFlow Backend: Existing REST APIs (already connected & tested) Method: POST Response format: JSON Screens & UI Elements (Already Created) Questionnaire page with inputs Q1 – Q10 “Submit Questionnaire” button Result page with Text Widget (output display) “Ask Any Question” input field “Ask” button Loading indicator widget Error display (Snackbar / Text) Tasks to Implement 1. Questionnaire Submission Flow Collect values from Q1–Q10 Combine them int...

    $9 Average bid
    การันตี

    Freelance Frontend Engineer – 2D Floor Plan Generator (React + Canvas + Geometry) About the Project We are building a 2D AI-assisted floor plan generator for OneCasa, a real estate and construction-tech platform. The system will automatically generate editable 2D house layouts based on user inputs such as: Plot size (Width × Length) BHK type Facing direction Floors Vastu preference Parking / Balcony requirement This is a draft-generation tool (not AutoCAD-level software). Project Objective Build a smart 2D layout engine that: Generates a floor plan automatically Ensures rooms fit within plot boundaries Prevents room overlap Maintains realistic adjacency rules Allows drag and resize editing Exports layout as PNG Stores layout as JSON OpenAI will be used for suggestion logic (ro...

    $272 Average bid
    $272 การประมูลเฉลี่ย
    20 คำเสนอราคา

    Hey! I’m looking to hire an experienced developer to build a universal product-detail scraping pipeline that takes a product URL (any website) and returns a complete structured product record. This is not a “simple HTML parse.” Many target sites are React/Next/Vue, load content via XHR/GraphQL, hide details behind tabs/accordions/modals, and lazy-load images/PDFs. The solution needs to reliably extract everything a human can see on the page, plus the underlying data used to render it. What the scraper must do (high level) Given a product URL, the pipeline should: Load the page like a real user (handle cookies/overlays). Capture all content from multiple sources (DOM + network + interactions). Use GPT API strategically to increase accuracy (field mapping, variant ext...

    $164 Average bid
    $164 การประมูลเฉลี่ย
    129 คำเสนอราคา
    Fix Polymarket Order Placement Issue
    2 วัน left
    ยืนยันแล้ว

    hello, i'm building a social layer for polymarket but can't place an ordrer trhough i keep getting this error XHR POST [HTTP/3 400 175ms] [CLOB Client] request error {"status":400,"statusText":"","data":{"error":"invalid signature"},"config":{"transitional":{"silentJSONParsing":true,"forcedJSONParsing":true,"clarifyTimeoutError":false},"adapter":["xhr","http","fetch"],"transformRequest":[null],"transformResponse":[null],"timeout":0,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","maxContentLength":-1,"maxBodyLength":-1,"...

    $160 Average bid
    $160 การประมูลเฉลี่ย
    118 คำเสนอราคา
    Scraper SRI datos contribuyente
    2 วัน left
    ยืนยันแล้ว

    Necesito automatizar la consulta de la siguiente página del SRI: Al ingresar un RUC o cédula debo obtener y guardar en un archivo JSON estos campos exactos: • Estado de Contribuyente • Razón social • Indicador de “Contribuyente fantasma” • Actividad económica principal Requerimientos técnicos: – El script debe funcionar bajo llamada, es decir, pueda ejecutarlo manualmente cada vez que lo necesite con una lista de RUCs como entrada. – La salida debe ser un json por cada Identificación consultada. – Incluye un breve README con instrucciones de instalación y uso. Criterios de aceptación: 2. El tiempo medio por consulta no debe exceder lo razonable para evitar bl...

    $453 Average bid
    $453 การประมูลเฉลี่ย
    61 คำเสนอราคา
    Power BI Deneb Visual
    1 วัน left
    ยืนยันแล้ว

    I need a custom Deneb visual in Power BI. The data will live entirely inside the visual specification—no Excel sheets, databases, or APIs to connect—so you can reference it directly as inline arrays within the Vega-Lite JSON. I've attached a mockup of how I need this visual to look, I've also attached some Vega Lite code which I've attempted to make work but it is a starting point, the code also contains an in-line dataset

    $159 Average bid
    $159 การประมูลเฉลี่ย
    96 คำเสนอราคา

    Summary: Development of a scalable web MVP for users to automate quote generation via voice input. The system must be designed from the outset to allow for rapid scaling to a large number of users (SaaS architecture). The development of a scalable web MVP for users to automate quote generation via voice input. The system must be built from the beginning to allow for rapid scaling to a large number of users. Experience in OpenAI API, PDF generation, and multi-language SaaS web applications is essential. Core Function (MVP Phase 1), Workflow 1. User records the quote or uploads an audio file. 2. Speech-to-text (OpenAI or alternative). 3. LLM converts text into structured JSON. 4. JSON is loaded into an editable quote form. 5. User can manually correct or add items. 6. Automatic ca...

    $567 Average bid
    $567 การประมูลเฉลี่ย
    153 คำเสนอราคา

    I'm seeking an experienced NLP developer to build a real-time pipeline that ingests text streams via API in JSON format. The primary purpose is sentiment monitoring. Key requirements: - Classify sentiment and categorize events - Output calibrated confidence levels - Deduplicate and validate data using rules - Log all activities for production Ideal skills and experience: - Proficient in NLP and machine learning - Experience with real-time data processing - Strong knowledge of API integration - Familiarity with data validation and logging techniques Please provide relevant portfolio and experience.

    $1109 Average bid
    $1109 การประมูลเฉลี่ย
    122 คำเสนอราคา

    Mores What functionality do you want the Telegram bot to have? bot que gestione una base de datos de usuarios y realice peticiones HTTP, Automaticas, API-based integration with external game servers (Unity/JSON). No standard SQL ¿Qué tipo de base de datos te gustaría usar? SQL ¿Qué tipo de peticiones HTTP debe realizar el bot automáticamente? The bot requires standard REST API methods (GET, POST, PUT) to interact, interact with JSON-based endpoints and handle authentication headers.

    $171 Average bid
    $171 การประมูลเฉลี่ย
    57 คำเสนอราคา
    Multi-Tenant Lab Management SaaS
    20 ชั่วโมง left
    ยืนยันแล้ว

    I already run a fully-featured laboratory management system on GoDaddy hosting and now need it refactored into a true multi-tenant SaaS application on AWS. The current codebase covers day-to-day lab workflows (inventory, result tracking, appointment scheduling), so your focus is to re-architect rather than rebuild. The new version must let me spin up and manage any number of client labs from a single codebase while guaranteeing clear data segregation and security between tenants. Each client should enjoy a self-serve onboarding flow and an integrated billing & invoicing module so subscriptions, usage tiers or manual charges can be handled inside the platform with no third-party spreadsheets. A crucial piece is test-report printing. Every client needs to: • upload their own logo ...

    $768 Average bid
    $768 การประมูลเฉลี่ย
    50 คำเสนอราคา
    SAP HANA Periodic JSON Data Export
    12 ชั่วโมง left
    ยืนยันแล้ว

    I need a techno-functional specialist who knows SAP HANA inside-out to set up an automated pipeline that pulls data from three live modules—Financial (FI), Production Planning (PP) and Plant Maintenance (PM)—and ships it to a remote server on a fixed schedule. Here is what I am after: • Build or configure the job inside HANA Server (HANA DB with query language access, or any proven method you recommend... No additional connector licenses will be bought) so that it extracts the required tables and views, converts the output to clean JSON and pushes it to the destination path via SFTP or a comparable secure protocol. • The transfer must run on a schedule that I can adjust easily (hourly, daily thrice weekly, etc.) without redeploying code. Preferably leave the cr...

    $19 / hr Average bid
    $19 / hr การประมูลเฉลี่ย
    22 คำเสนอราคา
    Next.js Directory Template Build - tempate provided
    8 ชั่วโมง left
    ยืนยันแล้ว

    I’m kicking off a new directory platform and need a clean, well-structured starter template built with the latest stable version of Next .js. The goal right now is to receive a solid, extensible codebase that I can grow into a full-featured listing site over the coming months. Here’s what I expect in this first milestone: • A modern Next .js project scaffolded with TypeScript, app router, and server-side rendering already configured. • Reusable layout components (header, footer, dynamic sidebar) and a responsive grid ready to display listing cards. • Fully wired global state management of your choice (Context, Zustand, or Redux Toolkit—whichever you’re most comfortable maintaining). • Placeholder pages for Listing Detail, Category, and Acc...

    $122 Average bid
    $122 การประมูลเฉลี่ย
    244 คำเสนอราคา
    Shopify Theme Layout & UI Revamp
    6 ชั่วโมง left

    I have a live Shopify store and ready-made visual references that capture the look and feel I want. What I need now is a Shopify expert who can translate those references into a polished custom theme, focusing on two areas: re-working the overall page layouts and elevating the user interface for a smoother, more modern shopping experience. You’ll be working directly in the latest Shopify 2.0 environment, so proficiency with Liquid, JSON templates, and responsive CSS is essential. The work spans the homepage, collection and product pages, plus a few key sections such as the header, footer, and cart drawer. No app installs or product data entry are involved—this project is purely about design and front-end refinement. To make our collaboration straightforward, I’ll supply...

    $326 Average bid
    $326 การประมูลเฉลี่ย
    45 คำเสนอราคา

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