Core REST Resource

100 Baseline Fixtures

Posts REST API & Data Model

Blog post articles containing title, body, user association, created dates, and full-text search indexing. Full CRUD simulation supporting persistent writes, relationship traversal, full-text filtering, and copy-on-write isolation per visitor session.

Full CRUD (GET, POST, PUT, PATCH, DELETE)Copy-on-Write Session OverlayRelational Sub-ResourcesFull-Text Search & Pagination

Live Posts Record Explorer

Live queries executed directly against GET /api/v1/posts.

Limit:

ID	Title	Author (user_id)	Body Excerpt	State
No records found matching query.

Page 1 of 1

Post Entity Schema & Field Dictionary

Exact property definitions, data types, nullability, and nested structures.

Field	Type	Required	Description	Example
id	number \| string	Required	Primary key. Integer (1-100) or local-<uuid>.	1
user_id	number \| string	Required	Foreign key referencing author users.id.	1
title	string	Required	Post headline. Indexed for full-text search (?q=...).	"sunt aut facere repellat"
body	string	Required	Article content paragraph. Indexed for full-text search.	"quia et suscipit suscipit..."
created_at	string	Optional	ISO 8601 creation timestamp.	"2026-01-15T08:30:00.000Z"
_sandbox	'created' \| 'updated'	Optional	Session mutation indicator added to modified records.	"created"

Entity Relationships & Nested Sub-Resources

Access related entities without multiple round trips using hierarchical REST sub-resource paths.

belongsTo

User

FK: user_id

GET /posts/:id/user

Author profile record associated with this article.

hasMany

Comments

FK: post_id

GET /posts/:id/comments

All discussion comments submitted on this post.

Copy-On-Write Sandbox Architecture

How stateful mutations persist during your test session without requiring database locks or affecting other developers.

Baseline Read-Only Layer

Every session starts with pristine baseline fixtures (25 users, 100 posts, 500 comments, 200 todos). These records are never permanently modified or locked.

Per-Visitor Overlay Tier

When you call POST, a local-<uuid> record is spawned. PUT / PATCH modifies your private overlay, and DELETE tags a tombstone marker.

Atomic Reset & Zero Lock

Sessions run in parallel with 100% isolation. A single call to POST /api/v1/sandbox/reset purges the overlay and restores clean initial data in <5ms.

Production Client Integration Recipes

Tested integration patterns for React Query, TypeScript Fetch, Axios, Python, and cURL:

// React 18+ with TanStack Query v5 & Optimistic Mutation

import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';

// 1. Fetch Paginated Collection

export function usePosts(page = 1, limit = 10, search = '') {

return useQuery({

queryKey: ['posts', page, limit, search],

queryFn: async () => {

const params = new URLSearchParams({ page: String(page), limit: String(limit) });

if (search) params.set('q', search);

const res = await fetch(https://playground.nileslabs.com/api/v1/posts?${params}`, {

credentials: 'include', // Includes visitor sandbox session

});

if (!res.ok) throw new Error('Failed to fetch posts');

return res.json();

});

}

// 2. Stateful Optimistic Create Mutation

export function useCreatePost() {

const queryClient = useQueryClient();

return useMutation({

mutationFn: async (newRecord) => {

const res = await fetch('https://playground.nileslabs.com/api/v1/posts', {

method: 'POST',

headers: { 'Content-Type': 'application/json' },

credentials: 'include',

body: JSON.stringify(newRecord),

});

if (!res.ok) throw new Error('Create failed');

return res.json();

onSuccess: () => {

Comments Collection

PreviousUsers Resource

NextComments Resource