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geojson.app

Open source mapping & geospatial data visualization.

A browser-based GeoJSON workbench. Drop, paste, or URL-load geospatial data and instantly visualise it on an interactive vector map — with measurement, drawing, and an embeddable JS SDK. No proprietary tile lock-in.

Visit geojson.app ↗The story
  • Geospatial
  • Open source
  • Developer tools
  • Mapping
geojson.app preview
Stack
Open source
Login required
Never
Embeddable
JS SDK
Cost
Free

The story

What it is.
Why we built it.

geojson.app is a geospatial data visualisation and processing toolkit built on a purely open-source web mapping stack. Drag a .geojson file in, paste raw GeoJSON, or load it from a URL — the map renders instantly with vector tiles, no account required.

Beyond viewing, the workbench gives you measurement, marker placement, polygon drawing, projection toggles, and a one-click "copy as GeoJSON" export for any feature. For developers, an embeddable JS SDK makes it trivial to add an interactive map to your own site without committing to a paid Mapbox or ArcGIS account.

It exists as the open-source alternative we wanted: fast, no-login, no lock-in, and built on tools the wider geospatial community can audit and extend.

Inside the product

What it helps you do.

01

Drag-and-drop GeoJSON

Drop a .geojson file onto the workbench or paste raw JSON and it renders on the map immediately. No accounts, no upload limits.

02

Load from URL

Pull GeoJSON straight from a URL — share a link to a hosted dataset and the map renders with the data inline.

03

Measure, draw, mark

Measure multi-point distances, draw polygons and multi-polygons, drop markers with custom positioning — all from the toolbar.

04

Copy as GeoJSON

Any drawn or selected feature can be copied straight back out as valid GeoJSON. The workbench is a two-way street.

05

Embeddable JS SDK

Add interactive maps to your own website using the JS SDK — no paid tile provider required for typical use.

06

Open stack, no lock-in

Built on open-source web mapping libraries so you can audit, extend, or migrate without fighting a proprietary tile provider.

Who it is for

Built around
real work.

  • Developers and GIS analysts who need a quick visualisation
  • Teams who want to embed a map without paying per tile request
  • Open-source mapping enthusiasts
  • Anyone debugging GeoJSON without spinning up QGIS

The decisions behind it

  • Purely open-source web mapping stack — no proprietary tile lock-in.
  • Hosted workbench AND embeddable JS SDK from one product.
  • GeoJSON-first workflow rather than format-agnostic generality.
  • No login wall, no upload limits, no per-request metering.

A few useful details.

Do I need an account?

No. Open the page, drop your file, and the map renders. Nothing is uploaded to a server you don't control.

What's the embeddable SDK?

A JS library you can add to your own site to render the same interactive maps. Useful for adding a map to a docs site, dashboard, or blog without a paid tile contract.

What file sizes does it handle?

Comfortable with typical GeoJSON workloads. Very large datasets may benefit from tile-serving instead — but for most everyday GIS files it's fine.

Is the source open?

It's built on a purely open-source web mapping stack. Visit geojson.app for the latest on the project's licensing and contribution model.

Pricing

Free

Built with

React + Vite · MapLibre GL JS · Tailwind CSS · Open-source vector tiles

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