Contractor‑Ready API Playground: Ship Stubs, Seeds & Feature Flags to Cut First‑Week Onboarding in Half
Written by AppWispr editorial
Return to blogCONTRACTOR‑READY API PLAYGROUND: SHIP STUBS, SEEDS & FEATURE FLAGS TO CUT FIRST‑WEEK ONBOARDING IN HALF
Ship a single ZIP to a contractor that answers every question they will ask in week one. This guide is a compact deliverables pack: exact filenames, example mock payloads, a Postman collection template, feature-flag toggles, and a 7‑task onboarding sprint. Use it to make contractors productive on day one and halve your first‑week onboarding time.
Section 1
Deliverable checklist — what you must hand over
Before the contractor clones the repo, deliver a small zipped package that contains five items: API stubs (mock server), seed data, a Postman collection with examples, a feature‑flag manifest, and a short acceptance test suite. Packaging these removes ambiguity: engineers won’t waste the first two days reading the codebase to reconstruct sample requests.
Structure the ZIP with clear filenames and one README. Keep the README under 300 words and put the absolute next steps (how to run the mock server, where to toggle flags, how to run acceptance tests) at the very top.
- api-playground.zip
- README.md — 3 steps to first API call
- mocks/ — mock server routes and examples (see filenames below)
- seeds/ — seed JSON files for each model
- postman/collection.postman_collection.json — collection with examples
- flags/feature-flags.yaml — toggles and descriptions per flag id (dev/staging keys included as placeholders).jsonld optional: acceptance-tests/**
Section 2
Exact filenames and one‑line purpose (copy these)
Use these file names verbatim inside your ZIP. They are intentionally short and predictable so contractors can script against them. The paths assume the contractor will run a local mock server from the root of the unpacked archive.
Each file should include a short header comment with owner contact and one-liner: purpose and the environment it targets.
- README.md — quickstart: how to run mock server and where to toggle flags
- mocks/server.js — minimal Express or json-server starter that mounts routes from mocks/routes/*.json
- mocks/routes/users.GET.json — example GET /api/v1/users response (single-page example below)
- mocks/routes/users.POST.json — saved request+response example for creating users
- seeds/users.seed.json — list of 6 realistic user objects for DB import
- postman/collection.postman_collection.json — collection with examples and environment variables (baseUrl, apiKey, flagClientKey). See example payloads section below for exact body shapes used in requests and responses (copy/paste ready).json
Section 3
Exact mock payloads (copy/paste ready)
Provide a canonical set of request and response bodies. Use a realistic but small dataset (3–6 items) and conservative identifiers for deterministic tests. Below are ready-to-use examples you can paste into mocks/routes/*.json or the Postman examples. Keep timestamps in ISO8601 and IDs short (u_1, u_2) to avoid parsing surprises.
These payloads are intentionally minimal but include the fields every contractor needs to implement features and acceptance tests: id, displayName, email, role, createdAt, and a small nested object for preferences.
- GET /api/v1/users — response (200): { "data": [{"id":"u_1","displayName":"Alex Rivera","email":"alex@appwispr.test","role":"admin","createdAt":"2026-01-15T09:30:00Z","preferences":{"emailNotifications":true}}]}
- POST /api/v1/users — request: {"displayName":"New User","email":"new@appwispr.test","role":"user","preferences":{"emailNotifications":false}} — response (201): {"data":{"id":"u_3","displayName":"New User","email":"new@appwispr.test","role":"user","createdAt":"2026-04-01T12:00:00Z","preferences":{"emailNotifications":false}}}
- Seed example (seeds/users.seed.json): [{"id":"u_1","displayName":"Alex Rivera","email":"alex@appwispr.test","role":"admin","createdAt":"2026-01-15T09:30:00Z","preferences":{"emailNotifications":true}},{"id":"u_2","displayName":"Casey Park","email":"casey@appwispr.test","role":"user","createdAt":"2026-02-02T14:22:00Z","preferences":{"emailNotifications":true}}]
Section 4
Feature‑flag manifest — give contractors safe levers
Provide a small YAML or JSON manifest listing the flags the contractor will touch. Each entry should include flag key, description, default state for dev/staging, and a suggested audience (e.g., internal QA only). This lets contractors implement guarding checks in code and run through both on/off acceptance paths without toggling production.
If you use a hosted provider (LaunchDarkly is a common choice), include SDK keys for dev and staging as placeholders and sample SDK initialization code. If you run a simple in‑repo flags table, include a migration snippet and a tiny admin page route so reviewers can flip flags in the staging environment.
- feature-flags.yaml example entry: |- id: enable_new_signup description: "Use new signup flow" default_dev: false default_staging: false audience: "qa-team"
- Provide a snippet for SDK init (pseudocode) and a small script to seed flags into the provider or DB.
- Document where to flip flags in the README and who owns the toggle (email or Slack channel).
Section 5
Acceptance tests and a 7‑task onboarding sprint
Give contractors a short test suite (Cypress, Playwright, or simple HTTP tests) that validates the critical happy and unhappy paths behind flags. Include fixtures that import the seed data and a test matrix that runs with the flag on and off. This removes guesswork about expected behavior and accelerates code review.
Pair the deliverables with a 7‑task onboarding sprint you expect a contractor to complete in week one. Each task is measurable and maps to a file or route in the shipped package so there’s no ambiguity in what counts as done.
- Acceptance tests: tests/acceptance/users.spec.js — checks GET /users returns seeded users, POST /users creates user and returns 201, and toggles behavior when enable_new_signup flag is true/false.
- 7‑task sprint (one per workday plus two small check-ins):
- - Day 1: Run the mock server and make the first request from the Postman collection.
- - Day 2: Wire the client to the mock API and implement the users list UI using seeded data.
- - Day 3: Implement POST /users flow and ensure tests pass locally.
- - Day 4: Integrate feature flag checks and run acceptance tests with flag off/on scenarios (staging). Verify flag flips change behavior as documented in feature-flags.yaml .</br>- Day 5: Fix security items (API key handling), add doc comments, and push a PR with screenshots and test results. - Day 6: Contractor demo to the founder/PM; merge small fixes. - Day 7: Finalize QA checklist, handoff notes, and remove or schedule cleanup tasks (e.g., remove temporary flags).
FAQ
Common follow-up questions
Do I need a paid feature‑flag provider for this to work?
No. You can start with a simple in‑repo flags table or environment‑aware JSON manifest and seed it into your staging DB. Hosted providers like LaunchDarkly speed operations and give a mature UI for audiences and targeting; include provider instructions in the manifest if you use one. Use the manifest to make clear which flags are temporary and which are permanent.
How large should the seed dataset be?
Keep it small and representative: 3–6 items per core model. Enough to cover edge cases (admin vs user, enabled vs disabled preferences) but not so large that tests and imports slow down. Small deterministic datasets make acceptance tests reliable and fast.
Should I include real API keys or credentials in the package?
Never include production keys. Provide placeholder keys and instructions to request real dev/staging keys from the ops owner. For hosted flag providers, include only non‑sensitive client keys intended for development; document where the real secrets live.
What format should the Postman collection use?
Export a Postman v2.1 collection JSON with examples attached to requests and an environment file that sets baseUrl, apiKey, and any flag client keys. Postman mock servers can be created from collection examples which is useful when contractors need a hosted mock quickly.
Sources
Research used in this article
Each generated article keeps its own linked source list so the underlying reporting is visible and easy to verify.
Postman
Mock APIs with response examples | Postman Docs
https://learning.postman.com/docs/design-apis/mock-apis/tutorials/mock-with-examples
Postman
Create and use a mock server using the Postman API | Postman Docs
https://learning.postman.com/docs/design-apis/mock-apis/mock-with-api/
Postman Blog
How to Mock APIs Locally During Development | Postman Blog
https://blog.postman.com/how-to-mock-apis-locally-during-development/
LaunchDarkly
Get started | LaunchDarkly Documentation
https://launchdarkly.com/docs/getting-started
LaunchDarkly
Feature Flag & Toggle Management | LaunchDarkly
https://developers.launchdarkly.com/
Postman
Generate fake test data Collection Template | Postman
https://web.postman.com/templates/collections/generate-fake-test-data/
Next step
Turn the idea into a build-ready plan.
AppWispr takes the research and packages it into a product brief, mockups, screenshots, and launch copy you can use right away.