Frontend & KYC• 7 min read• Published Sep 2026
Building Cascading Administrative Dropdowns in React with LGD Hierarchies
Implement dependent cascading selectors in React for Indian states, districts, sub-districts, and blocks without shipping heavy static datasets.
Data Hygiene in Rural Onboarding
Onboarding users in Indian rural fintech, credit scoring, e-commerce, or agrarian tech requires collecting verified administrative addresses. Allowing users to enter free-form text for sub-districts and tehsils produces severe data hygiene problems including spelling variations and unmapped locations.
The Cascading Dependent Selector Pattern
Select State (36 items) -> fires /v1/districts?state=:code
Select District (~20-30 items) -> fires /v1/subdistricts?district=:code & /v1/blocks?district=:code
Select Sub-district / Block -> Complete normalized address record
React Hook Pattern
// Fetch districts dynamically when state is selected
useEffect(() => {
if (!selectedState) return;
fetch(`/v1/districts?state=${selectedState}`)
.then(r => r.json())
.then(json => setDistricts(json.data));
}, [selectedState]);Indexed SEO Keywords:
#cascade dropdown state district subdistrict village react#india address verification lgd api#kyc village address normalization