Rate Limits

{"error":"rate_limit_exceeded","message":"Rate limit exceeded. Slow down and retry after 60 seconds."}

async function scrubWithRetry(phoneNumbers, apiKey, maxRetries = 5) {
  const baseUrl = "https://www.dncscrub.com/scrub";
  const url = `${baseUrl}?phone=${phoneNumbers.join(",")}`;
  const baseDelay = 1000; // Start with 1 second

  for (let attempt = 1; attempt <= maxRetries; attempt++) {
    let response;
    try {
      response = await fetch(url, { headers: { loginId: apiKey } });
    } catch (networkError) {
      // fetch throws on DNS/connection failures; treat like a 5xx and retry
      response = { ok: false, status: 0 };
    }

    if (response.ok) {
      return await response.json();
    }

    const retryable = response.status === 429 || response.status >= 500 || response.status === 0;
    if (retryable && attempt < maxRetries) {
      // 429 = rate limited: wait out the one-minute window before retrying
      // 5xx / network error = transient failure: exponential backoff 1s, 2s, 4s, 8s, 16s
      const delay =
        response.status === 429 ? 60000 : baseDelay * Math.pow(2, attempt - 1);
      console.log(
        `Request failed with ${response.status || "network error"}. Retrying in ${
          delay / 1000
        }s (attempt ${attempt}/${maxRetries})...`
      );
      await new Promise((resolve) => setTimeout(resolve, delay));
      continue;
    }

    throw new Error(`Request failed with status ${response.status}`);
  }
  throw new Error("Max retries exceeded");
}

// Usage
const results = await scrubWithRetry(
  ["5551234567", "5559876543"],
  "your-api-key"
);