What is the History API?
PICTURE THIS: REACT RENDER CYCLE
Simple meaning
PushState and replaceState change the URL without a full reload, which SPAs use for routing.
WHY — Web APIs instead of guessing?
Why interviewers care about Web APIs:
people who only read docs from people who shipped.
and tied to Frontend work.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1PushState and replaceState change
the URL without a full reload, which SPAs use for routing.
- 2Popstate fires on back
and forward.
- 3Next.js and React Router
wrap this so I rarely call it raw except in odd integrations.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
PushState and replaceState change the URL without a full reload, which SPAs use for routing. Popstate fires on back and forward.