The ultimate guide to hiring a web developer in 2021
If you want to stay competitive in 2021, you need a high quality website. Learn how to hire the best possible web developer for your business fast.
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:
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 134,449 reviews, clients rate our JSON Developers 4.9 out of 5 stars.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:
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 134,449 reviews, clients rate our JSON Developers 4.9 out of 5 stars.I have a batch of PDF-based clinical notes and I want an automated routine—ideally powered by Anthropic’s Claude or a comparable large-language-model pipeline—that will (1) confirm each file is indeed a clinical note and (2) pull out two key data groups: • Patient information (full name, DOB, medical record number, and any other standard demographics present) • Every physician referenced in the note, including those listed in the “Cc” section or mentioned elsewhere in the narrative Source files may vary in layout, so the parser has to cope with scanned text (OCR may be required), mixed fonts, and occasional handwritten annotations. I can supply a small, representative sample for calibration and a larger set once the script is stable. Please retu...
I need a lightweight proof-of-concept that demonstrates an end-to-end OAuth 2.0 flow against a real healthcare EMR, then uses the granted token to call the FHIR Patient endpoint. The aim is simple: confirm that system-to-system (backend) credentials can be exchanged for an access token and that—with that token—I can reliably pull a single Patient resource when I supply either the patient’s MRN or their ID. Here is how I picture the work: • Implement the OAuth 2.0 client IN GO using the EMR vendor’s documented authorization-code or client-credentials flow (whichever the API allows for backend access). • Once authenticated, call the FHIR /Patient search endpoint twice—first filtering by identifier type “MRN”, then by the native “ID&...
iOS App Development Brief: Revaliday 1. Project Objective We are looking for an iOS developer (Swift/SwiftUI) to build the native mobile client for Revaliday, a real-time multiplayer medical quiz game. Current Project State: The platform is completely functional. We already have a fully operational HTML/web client, and the backend ecosystem—powered by a custom Java WebSocket signaling server—is 100% finished. The AI matchmaking, round management, and game logic are handled entirely server-side. Your Role: Your task is solely to build the native iOS interface and connect it to our existing WebSocket (WS) server. You will not need to write any game logic. The app acts as a lightweight client that sends user interactions and updates the UI based on incoming JSON payloads. 2. Co...
WhatsApp API (XpressBot) Integration with DaySchedule API Project Overview I am using the WhatsApp Business API through and want to integrate the DaySchedule API into my WhatsApp chatbot. The goal is to allow users to book appointments directly within the WhatsApp conversation without leaving the chat. Requirements - Integrate the DaySchedule API with my existing XpressBot WhatsApp bot. - Display available appointment dates and time slots to users. - Allow users to select their preferred date and time through WhatsApp interactive messages (buttons or list messages if supported). - Create the appointment in DaySchedule after the user confirms the slot. - Send a confirmation message with the booking details. - Handle errors such as unavailable slots or API failures gracefully. - Provid...
Project Description: We are looking for an experienced React developer with Chrome Extension expertise to fix and improve the data scraping logic in an existing Chrome Extension built with React. The extension is already functional, but the scraping logic needs to be updated to reliably extract data from a target website. The ideal candidate should have experience with Chrome Extension Manifest V3, DOM manipulation, and modern JavaScript/TypeScript development. Budget: $25 Required Skills JavaScript TypeScript React.js Chrome Extension Development Google Chrome Extensions Manifest V3 HTML5 CSS3 DOM Manipulation Web Scraping Content Scripts Background Service Worker Browser APIs JSON Git GitHub Debugging REST API npm Vite
My React front-end is fairly stable, yet the Node.js / Express REST layer that feeds it still trips over itself. Some endpoints lag, others throw inconsistent errors, and the authentication flow occasionally lets requests slip through untouched. Here is what I need from you: • Profile every REST route, identify the hotspots, and bring average response times back to an acceptable range. • Add (or tighten) centralized error-handling so callers always receive a predictable JSON structure. • Review the current authentication / authorization middleware, patch any logic holes, and make sure protected routes really stay protected. • Clean up any code smells you encounter along the way so future maintenance is easier. I exercise the API with Postman at the moment, b...
I need an experienced ComfyUI developer to review one existing workflow JSON file and answer entire workflow about it and make a small correction. The workflow is intended for realistic AI image generation. I will provide the current workflow file and details about the issue. Scope Review one ComfyUI workflow JSON Identify missing, incorrect, or disconnected nodes Make the minimum changes required for the workflow to load and run Confirm which models, custom nodes, or files are required Return the corrected workflow JSON Provide short setup and testing instructions Deliverables Corrected ComfyUI workflow JSON List of required models and custom nodes Short explanation of the issue Screenshot or sample output showing that the workflow runs Important This is a small paid trial task. The $...
I have a Google Sheet set up and now need it to fill itself with real–time option chain data pulled directly from the NSE website. The sheet should refresh automatically every five minutes; no extra calculations or fancy formatting are required—just the raw values exactly as they appear on the exchange. My expectation is that the solution runs entirely inside Google Workspace, ideally through an Apps Script that fetches the JSON/HTML payload from NSE, parses the option chain, and pushes the results into predefined columns. A simple time-based trigger should handle the five-minute refresh. Deliverables • Google Apps Script (fully commented). • Trigger configuration so updates fire every five minutes. • Brief note explaining any NSE endpoints used and how t...
I have full-device backups created on Android 13 with Samsung Smart Switch as well as the matching Google Takeout archive. I need a small utility—or a clear, repeatable script—that digs into those encrypted/compressed files, extracts three very specific datasets, and spits them out in a clean, usable format. The targets are browser history, app history (install/uninstall and usage metadata), and system or per-app settings. All other content such as photos, contacts, or messages can be ignored. The device is my own and can load up using USB debugging mode to access if necessary You are free to choose the stack you prefer; Python with sqlite3/pandas, a lightweight Kotlin/Java CLI, or even a cross-platform Node.js solution are perfectly fine as long as they run on Windows or Lin...
I need a lean, well-documented script that can pull real-time stock-price and trading-volume feeds simultaneously from both NSE and BSE. The workflow is simple: the moment the markets move, the script should hit the official exchange or approved third-party APIs, filter the stream through my own set of conditions (I will share the exact logic after project start), and return only the symbols that match. A few practical notes: • Speed matters more than fancy UI, so an efficient language such as Python (asyncio, websockets, pandas) or Node.js is ideal, but I’m open to alternatives as long as latency stays low. • The output can be JSON, CSV, or pushed into a lightweight database—whichever you feel keeps things fastest and easiest to maintain. • Error handli...
I maintain a referral network that relies on a multi-thousand-item product taxonomy and a relationship graph. Right now the data shows three main pain points, with correcting miscategorized items at the top of the list. Inconsistent tags appear everywhere—22 categories and more than 200 sub-categories—so each pass you make must scale yet still catch edge cases. You’ll work from my written rules and the issue log, using a combination of Python scripts (working with JSON and CSV exports) and careful manual review. Scripts can handle bulk renaming, tag normalization, and simple validation; your judgement comes in when a product seems to straddle two categories or when a referral link just feels off. Deliverables • A cleaned taxonomy file (CSV or JSON) with corre...
Project Title: Low-Power Cellular IoT Predictive Maintenance & Leak Detection System Project Overview: We are seeking an experienced developer to design and prototype an integrated, low-power, battery-operated IoT device utilizing an off-the-shelf cellular prototyping architecture (e.g., Particle Boron or Blues Wireless Notecard). The device will perform twin monitoring tasks: physical leak detection via a traditional sensor, and mechanical predictive maintenance via Acoustic Anomaly Detection (AAD). The system must run on a battery budget that supports deep sleep, waking up instantly on a leak interrupt or periodically on a timer to perform a self-test and acoustic health assessment. Data must route through a cloud middleware layer via webhooks to a custom website dashboard, with cri...
I have a live application whose core runs on PHP while several service layers are written in Node.js. Everything works—until the JSON we pass between layers silently shifts and breaks the backend. Right now I only need bug fixes; no new features or tuning, just rock-solid stability. Here’s what I’m dealing with: • backend endpoints intermittently return malformed or incomplete JSON • downstream PHP code then throws errors or stops responding altogether Your job is to trace where the JSON structure changes, correct the offending Node or PHP handlers, and make sure the same schema is respected throughout every call. Once the patch is in place I’ll want the updated code committed to Git and a brief note of what was changed so I can follow along. Aut...
Title: SurveyJS Form, Configurable Rules Engine & Compliance Dashboard – Pilot Project v2 *** Please completely read the description as it has been updated Project Description I’m looking for an experienced developer to help digitize and automate a complex compliance/reporting form based on reporting guidance. The goal is to replace manually reviewed forms and manual Excel summaries with a SurveyJS‑based solution, a configurable rules engine, and a reporting/dashboard layer. The work will start with a small paid pilot task so you can demonstrate your ability before we expand to the full project. What I need The final solution should: - Build the full questionnaire in SurveyJS (JSON) based on an existing annotated PDF form and instructions. - Implement completeness and ...
I need a reliable web-scraping solution that pulls up-to-date market statistics focused on individual wrestlers. The target sites are public sports portals and federations that list match results, rankings, and season performance; I’ll supply the URLs as soon as we start. The scraper must extract for every athlete: full name, weight class, team or club, most recent match outcome, cumulative win-loss record, points scored, and ranking movement over time. I want the data normalised into a single CSV and a companion JSON feed so it can drop straight into my analytics pipeline. Python is my usual stack, so Scrapy, BeautifulSoup, or a light Selenium layer for the occasional dynamic page all work. Please build in polite rate limiting, user-agent rotation, and a quick retry strategy so th...
Title: SurveyJS Form, Configurable Rules Engine & Compliance Dashboard – Pilot Project Project Description I’m looking for an experienced developer to help digitize and automate a complex compliance/reporting form based on reporting guidance. The goal is to replace manually reviewed forms and manual Excel summaries with a SurveyJS‑based solution, a configurable rules engine, and a reporting/dashboard layer. The work will start with a small paid pilot task so you can demonstrate your ability before we expand to the full project. What I need The final solution should: - Build the full questionnaire in SurveyJS (JSON) based on an existing annotated PDF form and instructions. - Implement completeness and consistency rules (required fields, conditional questions, required upl...
I need real-time odds from both Betfair and Pinnacle stream. I do need funded verified pinnacle and betfair account with odds feed. Need just accounts or working api that use account with 0 latency
I’m enhancing an existing PHP application and now need an experienced developer to wire in several third-party services. The core of the job is to analyse each provider’s endpoint requirements, extend or refactor the current codebase where necessary, and make sure the new integrations run smoothly alongside what is already in production. You will be working with modern PHP (object-oriented, namespaced) on a LAMP stack, so familiarity with RESTful requests, webhooks, JSON handling, and robust error logging is essential. Security is a must—token management, input sanitisation, and graceful failure states all have to be considered from the outset. I’ll give you access to the repository, environment details and any documentation the vendors supply. Your work should pl...
¿Eres experto en automatización con Make y APIs de IA? Necesitamos tu apoyo esta semana. Estamos construyendo un flujo de automatización para la captación y calificación de leads para una comunidad de Skool sobre finanzas digitales, y buscamos a un freelancer que nos ayude a implementarlo de principio a fin, de forma técnica y ordenada. El proyecto consiste en conectar y configurar las siguientes piezas: un formulario/proceso en Skool que captura respuestas de un lead, un webhook que envía esas respuestas a un escenario en Make, un módulo de Claude (API) que analiza las respuestas y genera un resumen del lead, su prioridad y su perfil de inversionista, y un módulo de parseo de JSON que estructura esa información. Luego...
¿Eres experto en automatización con Make y APIs de IA? Necesitamos tu apoyo esta semana. Estamos construyendo un flujo de automatización para la captación y calificación de leads para una comunidad de Skool sobre finanzas digitales, y buscamos a un freelancer que nos ayude a implementarlo de principio a fin, de forma técnica y ordenada. El proyecto consiste en conectar y configurar las siguientes piezas: un formulario/proceso en Skool que captura respuestas de un lead, un webhook que envía esas respuestas a un escenario en Make, un módulo de Claude (API) que analiza las respuestas y genera un resumen del lead, su prioridad y su perfil de inversionista, y un módulo de parseo de JSON que estructura esa información. Luego...
If you want to stay competitive in 2021, you need a high quality website. Learn how to hire the best possible web developer for your business fast.
Learn how to find and work with a top-rated Google Chrome Developer for your project today!
Learn how to find and work with a skilled Geolocation Developer for your project. Tips and tricks to ensure successful collaboration.