Features

A cleaner toolkit for frontend-heavy teams.

Everything in Fake API for Devs is designed to reduce setup friction and improve readability while you are building, reviewing, and demoing UI flows.

New feature

Personal API sandbox sessions

Generate a free session key in one click. Send it as the X-Demo-Key header and your writes persist for 12 hours in a completely isolated namespace — visible only to you. Everyone else still sees the original static data.

Choose how much seed data you start with, then add records, patch fields, or delete entries at will. Perfect for demoing CRUD flows, testing optimistic UI, or validating form integrations.

Get a sandbox keyView the docs

What you get

  • Isolated 12-hour session — Your writes are invisible to every other user.
  • Three seed modes — Start with 60 records, a small slice (3–15), or empty.
  • Real CRUD persistence — POST, PATCH, PUT, and DELETE all stick for the session.
  • No signup or account — One click to generate a key — zero friction.
  • Header-based auth — Send X-Demo-Key with every request. That's it.
  • Automatic key reuse — Keys with >2 hours remaining are reused automatically.

Example request

curl -X POST \
  -H "X-Demo-Key: dk_your_key" \
  -H "Content-Type: application/json" \
  -d '{"name":"New Item"}' \
  https://fakeapifordevs.vercel.app/api/crm/contacts

Core features

Everything else you need.

Production-shaped responses

Give UI work believable data sooner, with payloads that feel close to live systems instead of placeholder lorem ipsum JSON.

  • Useful field names
  • Predictable response envelopes
  • More realistic demos

33 domains ready

Move across auth, commerce, SaaS, logistics, healthcare, analytics, and more without changing tools or mental models.

  • Shared conventions
  • Aligned docs
  • One playground

Latency and pagination controls

Test the parts of the UI that break first: loading states, long lists, empty states, and incremental updates.

  • page support
  • per_page support
  • delay support

Safer frontend iteration

Prototype flows before backend contracts settle, without depending on unstable staging services or temporary mocks.

  • No auth setup
  • No env juggling
  • No backend blockers

Deep links that preserve state

Share an exact request state with teammates from docs, domain pages, or the landing-page playground.

  • Selected domain
  • Selected method
  • Selected path

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  • Funds deeper route coverage
  • Keeps UX improvements shipping
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Ready to test

Open the sandbox and start from a real route.

Generate a key, pick your seed mode, and make your first write in under a minute. No backend needed.

Get your sandbox keyTry the playground