smart-api-fetcher/index.js

A smart fetch utility with retries, timeout, and automatic JSON parsing.

// index.js
/**
 * Smart API Fetcher
 * A wrapper for fetch with:
 * - Retry mechanism
 * - Timeout support
 * - Auto JSON parsing
 */

async function smartFetch(url, options = {}) {
  const {
    retries = 3,
    timeout = 5000,
    retryDelay = 1000,
    fetchOptions = {}
  } = options;

  let attempt = 0;

  const fetchWithTimeout = (url, opts) => {
    return new Promise((resolve, reject) => {
      const controller = new AbortController();
      const timer = setTimeout(() => {
        controller.abort();
        reject(new Error(`Request timed out after ${timeout}ms`));
      }, timeout);

      fetch(url, { ...opts, signal: controller.signal })
        .then(res => {
          clearTimeout(timer);

          if (!res.ok) {
            reject(new Error(`HTTP error! Status: ${res.status}`));
          } else {
            return res.json().then(data => resolve(data));
          }
        })
        .catch(err => {
          clearTimeout(timer);
          reject(err);
        });
    });
  };

  while (attempt <= retries) {
    try {
      return await fetchWithTimeout(url, fetchOptions);
    } catch (error) {
      if (attempt === retries) {
        throw error;
      }

      console.warn(
        `Attempt ${attempt + 1} failed: ${error.message}. Retrying in ${retryDelay}ms...`
      );
      await new Promise(res => setTimeout(res, retryDelay));
      attempt++;
    }
  }
}

module.exports = smartFetch;