Fetch Playground - Interactive Lab | IconVault
Send real fetch requests with cache modes, streaming progress, timeouts and retry with exponential backoff. Free, runs in your browser.
Fetch Playground
Cache modes, streaming progress, retry with backoff
5 of 5 free requests left.
Real fetch() from your browser. Cross-origin APIs may refuse with a CORS error; that is the server's policy, not a bug here.
No request yet
Pick a demo endpoint or enter your own URL, then send a real request.
Copyable pattern
// retry with exponential backoff + streaming progress
async function fetchWithRetry(url, { retries = 3, baseDelay = 500 } = {}) {
for (let attempt = 0; ; attempt++) {
try {
const res = await fetch(url, {
method: "GET",
cache: "default",
});
if (!res.ok && attempt < retries) throw new Error("HTTP " + res.status);
return res;
} catch (err) {
if (attempt >= retries) throw err;
await new Promise(r => setTimeout(r, baseDelay * 2 ** attempt));
}
}
}About this tool
IconVault's Fetch Playground is a real browser REST client for learning the Fetch API. Send actual requests with any method, headers and body, switch between cache modes like no-store and force-cache, watch streaming download progress byte by byte, and configure retry with exponential backoff to see how resilient clients behave against 500s and dead hosts. It is free and runs fully in your browser.
Every attempt is logged with timing, status and backoff waits, and the page generates a copyable fetchWithRetry pattern matching your settings. A honest note: cross-origin APIs may refuse browser requests with a CORS error, which is the server's policy and is reported as-is.
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