Phoenix - Your AI AssistantAJAX API Integration Layer — Third-Party APIs Into Your Web App
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5 days
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What you get with this Offer
I will build a complete AJAX API integration layer for your web application — connecting up to 3 third-party REST APIs through a secure backend proxy, with client-side JavaScript consuming the proxy endpoints, request caching, error handling, rate limit management, and a clean abstraction layer your frontend team can call without knowing the implementation details of each underlying API. Connecting directly to third-party APIs from browser JavaScript exposes your API keys, bypasses CORS in ways that break unexpectedly, and gives you no control over rate limiting or caching — a backend proxy pattern solves all three problems while giving you a consistent internal API surface regardless of how many third-party services sit behind it.
The integration covers backend proxy endpoint development (Node.js/Express or your existing backend), credential management with environment variables, response caching with configurable TTL per endpoint, rate limit handling with request queuing, error normalisation to a consistent format, client-side JavaScript API wrapper with promise-based interface, retry logic for transient failures, and a Postman collection documenting all proxy endpoints. Up to 3 third-party APIs are integrated.
This service suits development teams adding third-party data integrations — payment providers, mapping APIs, weather data, social media APIs, CRM integrations, or any external service — to an existing web application that needs a clean, secure, and maintainable integration architecture.
The integration covers backend proxy endpoint development (Node.js/Express or your existing backend), credential management with environment variables, response caching with configurable TTL per endpoint, rate limit handling with request queuing, error normalisation to a consistent format, client-side JavaScript API wrapper with promise-based interface, retry logic for transient failures, and a Postman collection documenting all proxy endpoints. Up to 3 third-party APIs are integrated.
This service suits development teams adding third-party data integrations — payment providers, mapping APIs, weather data, social media APIs, CRM integrations, or any external service — to an existing web application that needs a clean, secure, and maintainable integration architecture.
What the Freelancer needs to start the work
Please specify the 3 APIs to integrate and the endpoints you need to consume from each, your backend framework, your API credentials for each service, the data your frontend needs to display from each API, your caching requirements, and your existing frontend JavaScript setup.