How a simple internet standard became the language of our digital maps

Cultures · Published 10 October 2026 · Updated 25 October 2026 Swipe more like this →

In short: GeoJSON is the invisible backbone of modern navigation, turning complex geography into a lightweight, machine-readable format. Born from a grassroots developer movement rather than a formal standards body, it allows everything from street boundaries to service coverage areas to be shared across the web with remarkable efficiency and precision.

The story of GeoJSON began in March 2007, when a working group of developers sought to create an open, accessible standard for geographic data. By June 2008, the specification was finalized, eventually leading to its formal adoption as RFC 7946 by the Internet Engineering Task Force in August 2016. Unlike traditional geographic information systems, GeoJSON is built upon the widely used JSON format, making it exceptionally easy for developers to integrate into web applications.

At its core, GeoJSON represents spatial features as points, line strings, or polygons, using the WGS 84 coordinate reference system. A point is defined by decimal longitude and latitude, with an optional third value for elevation in meters. Because it is an open standard, it is not restricted to physical geography; it is frequently used by routing and navigation apps to define service zones or track movement. However, as datasets grow, standard GeoJSON can become bulky.

To solve this, developers created TopoJSON, an extension that encodes topology by stitching geometries together using shared segments called arcs. By defining each arc only once and referencing it multiple times, TopoJSON significantly reduces file redundancy and size. This format supports advanced cartographic tasks like automatic map coloring and topology-preserving simplification. For even greater performance, developers often turn to newline-delimited variants like GeoJSONL or GeoJSONSeq, which allow tools to parse individual records in parallel, offering a faster alternative for massive datasets.

The flexibility of these formats has made them essential for modern digital mapping. Whether it is a simple point representing a location or a complex polygon defining a national border, the evolution from the original GeoJSON specification to specialized tools like TopoJSON demonstrates how a community-driven project can fundamentally change how we visualize and interact with the world around us.

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