~/tools / 10 / delayed-api-response

Latency Simulator

On localhost every response lands in 5ms and every spinner looks perfect. Reality ships 3G. Dial in real latency — a 3-second delay to watch your skeleton screens actually render, or an 8-second stall to prove your AbortController timeouts and retry toasts fire before users rage-refresh. The delay is honored client-side by the interceptor, no throttling proxy required.

compose payload

template preset

status code latency (ms)

response body — live JSON editor

— validating —

exported mock url

—

▸ open mock ↗

simulated response headers

$ man slow-network

Everything above is encoded into the #data= fragment of the exported URL — deflated and base64url-packed by your browser. Fragments are never sent to any server, so this mock is shareable and private. Paste the URL anywhere: a teammate's browser decodes it identically.

grep -i related-searches

simulate slow api response
test loading skeleton screen
delayed json endpoint online
api latency simulator free
test fetch timeout abortcontroller