# Mapbox GL JS — Interactive Vector Tile Maps in the Browser

> A JavaScript library for rendering interactive, GPU-accelerated maps using vector tiles and WebGL.

## Install

Save in your project root:

# Mapbox GL JS — Interactive Vector Tile Maps in the Browser

## Quick Use
```bash
npm install mapbox-gl
```
```html
<link href="https://api.mapbox.com/mapbox-gl-js/v3/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3/mapbox-gl.js"></script>
<div id="map" style="width:100%;height:400px;"></div>
<script>
  const map = new mapboxgl.Map({
    container: 'map', style: 'mapbox://styles/mapbox/streets-v12',
    center: [-74.5, 40], zoom: 9
  });
</script>
```

## Introduction
Mapbox GL JS is a client-side JavaScript library for building fast, interactive maps powered by vector tiles and WebGL rendering. It gives developers fine-grained control over map styling, camera animations, and data-driven visualizations directly in the browser.

## What Mapbox GL JS Does
- Renders vector and raster tile maps with hardware-accelerated WebGL for smooth pan and zoom
- Supports custom map styles defined in the Mapbox Style Specification (JSON-based)
- Displays GeoJSON, image, video, and canvas data sources as map layers
- Provides 3D terrain, building extrusions, sky rendering, and fog effects
- Offers event handling for clicks, hovers, and drag interactions on map features

## Architecture Overview
The library runs entirely in the browser, using Web Workers to parse and decode vector tiles off the main thread. Rendering is handled by a WebGL pipeline that composites multiple style layers (fill, line, symbol, circle, heatmap) in a single draw pass. The style engine evaluates data-driven expressions at render time for dynamic theming.

## Self-Hosting & Configuration
- Obtain an access token from your Mapbox account to load default tile sources
- Use self-hosted vector tiles via a custom tile server (Martin, TileServer GL) if you need offline maps
- Configure styles as JSON and serve them from any static host or CDN
- Bundle via npm with tree-shaking support for optimized builds
- Set maxBounds, minZoom, maxZoom, and bearing/pitch constraints on the Map constructor

## Key Features
- Data-driven styling with expressions for color ramps, icon sizing, and label placement
- Globe projection for world-scale views alongside Mercator and other projections
- Client-side clustering for efficient rendering of large point datasets
- Built-in geocoder, navigation controls, and geolocate widgets
- Terrain and hillshade layers from raster-DEM tile sources

## Comparison with Similar Tools
- **Leaflet** — simpler API and lighter weight; Mapbox GL JS offers richer 3D and vector tile capabilities
- **MapLibre GL JS** — community fork of Mapbox GL v1; Mapbox GL JS v3 adds globe view and performance updates
- **OpenLayers** — supports more OGC standards; Mapbox GL JS focuses on vector tile rendering speed
- **Google Maps JS API** — proprietary with usage fees; Mapbox GL JS allows full style customization
- **Deck.gl** — specialized for large-scale data overlays; Mapbox GL JS serves as the base map layer beneath Deck

## FAQ
**Q: Is Mapbox GL JS free to use?**
A: Mapbox offers a free tier with generous monthly limits. The library itself is open source (3-Clause BSD), but loading tiles from Mapbox servers requires a token and may incur usage-based charges.

**Q: Can I use it without the Mapbox tile service?**
A: Yes. Point the style to any MVT-compatible tile server. Community tools like Martin or TileServer GL can serve self-hosted tiles.

**Q: How does it compare performance-wise to raster maps?**
A: Vector tiles are smaller over the wire, render at any zoom level without pixelation, and allow dynamic re-styling without re-fetching data. GPU rendering keeps frame rates high even with complex styles.

**Q: Does it work on mobile browsers?**
A: Yes. Mapbox GL JS supports touch interactions and adapts rendering quality to device capabilities. For native apps, Mapbox provides separate iOS and Android SDKs.

## Sources
- https://github.com/mapbox/mapbox-gl-js
- https://docs.mapbox.com/mapbox-gl-js/

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Source: https://tokrepo.com/en/workflows/asset-7c089a58
Author: AI Open Source