Data & Query Engine

Relational Filtering

Query records by exact property values, foreign keys, nested object paths, and boolean status flags. Query filters are automatically parsed, type-coerced, and evaluated in memory against your active session overlay.

Filter Query Builder

Pick a preset scenario or test custom query parameters against the live API:

Author Foreign Key

Matches exact foreign key userId=1 across all merged global and session-created blog posts.

GET /posts?userId=1

userId1

Coerced to integer matching posts authored by user 1

Live API RunnerMethod: GET

Live Request Console

GET

response.json

{

// Click "Send" above to execute this request against the live server.

}

Type Coercion & Evaluation Rules

Because URL query parameters are inherently strings, the engine automatically detects and coerces values before filtering.

Filter Type	Example Query	Coerced Type	Evaluation Logic
Integer / Foreign Key	?userId=1	Number	Strict numeric comparison (`item.userId === 1`).
Boolean Flag	?completed=true	Boolean	Coerces `"true"\|"false"` to strict boolean values.
String / Category	?category=Laptops	String	Case-insensitive exact string match across record values.
Nested Dot-Notation	?address.city=Gwenborough	Deep Object	Safely traverses nested JSON objects without throwing null references.
Compound Logical AND	?userId=1&completed=false	Multiple	All specified query filters must evaluate to `true` simultaneously.

Client Integration Recipes

Clean code patterns for dynamic query parameters in production applications:

hooks/useFilteredPosts.ts

// hooks/useFilteredResources.ts

import { useState, useEffect } from 'react';

export function useFilteredPosts(userId?: number) {

const [posts, setPosts] = useState([]);

const [loading, setLoading] = useState(true);

useEffect(() => {

const params = new URLSearchParams();

if (userId !== undefined) {

params.set('userId', String(userId));

}

const url = https://playground.nileslabs.com/api/v1/posts${params.toString() ? `?${params.toString()}` : ''}`;

fetch(url, { credentials: 'include' })

.then((res) => res.json())

.then((data) => {

setPosts(data.data || data);

setLoading(false);

})

.catch((err) => {

console.error('Filter request failed', err);

setLoading(false);

});

}, [userId]);

return { posts, loading };

}

Next Query Feature

Full-Text Search Engine

Related Query Feature

Dynamic Multi-Type Sorting

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