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JAVASCRIPT Snippets.

Gracefully Handling Specific HTTP Error Status Codes with Fetch

Learn to interpret and respond to specific HTTP status codes (e.g., 401, 404, 500) from API responses using JavaScript's fetch API for robust error management.

Making a PATCH Request to Update a Partial Resource

Learn to send a `PATCH` request using JavaScript's `fetch` API for efficient partial updates to resources, sending only changed fields to the server.

Optimizing API Calls with ETag and If-None-Match

Learn to optimize API requests using HTTP ETag headers and the If-None-Match condition to reduce bandwidth and server load by fetching data only when it has changed.

Implementing a Circuit Breaker for Resilient API Calls

Enhance API call resilience using the Circuit Breaker pattern to prevent cascading failures by temporarily blocking requests to services experiencing issues.

Uploading Multiple Files to an API with FormData

Discover how to efficiently upload multiple files to an API endpoint using JavaScript's FormData object, perfect for forms requiring several file attachments.

Implementing Graceful API Degradation with Fallbacks

Learn to implement graceful degradation for API integrations by providing fallback data or a simplified UI when primary API calls fail, improving user experience.

Performing GraphQL Mutations with Vanilla JavaScript

Execute GraphQL mutations using vanilla JavaScript and the fetch API to create, update, or delete data, providing direct interaction with your GraphQL backend.

Simple Node.js Proxy for Third-Party APIs

Learn how to create a basic Node.js proxy server using Express to securely access third-party APIs from your frontend, bypassing CORS restrictions and hiding API keys.

Receiving and Validating Webhooks in Node.js

Implement a secure Node.js endpoint with Express to receive and validate incoming webhooks from services like Stripe or GitHub, ensuring data integrity using signature verification.

Querying a GraphQL API with Vanilla JavaScript fetch

Discover how to make GraphQL queries and mutations directly using the vanilla JavaScript `fetch` API, enabling lightweight integrations without needing heavy client libraries.

Consuming Server-Sent Events (SSE) for Real-time Updates

Implement real-time data streaming in your web application by consuming Server-Sent Events (SSE) using the native EventSource API for efficient live updates from a server.

Batching Multiple Independent API Requests with Promise.all

Improve web application performance by concurrently fetching data from multiple independent API endpoints using JavaScript's `Promise.all`, reducing overall loading times.