GeoJSON Viewer and Validator

GeoJSON Viewer and Validator – Visualize and Check Your Spatial Data

Experience

Working with maps and geospatial data often involves GeoJSON, the lightweight JSON-based format for encoding geographical features. Developers use it for APIs, GIS tools, and frontend map rendering. Analysts and planners rely on it to share boundaries, routes, and points of interest. But GeoJSON can be tricky — a small syntax error, invalid coordinates, or missing geometry type can break your map or visualization.

The GeoJSON Viewer and Validator at FreeAiToolsOnline.com is built for exactly these scenarios. It gives you two essential tools in one: a viewer to render your GeoJSON on an interactive map, and a validator to check if your file follows the official GeoJSON specification. Whether you’re a developer integrating with Leaflet or Mapbox, a data analyst preparing datasets, or a student learning spatial formats, this tool saves time and ensures accuracy.

Expertise

The tool provides two main capabilities:

• Viewer
  • Drag and drop or paste GeoJSON.
  • See points, lines, polygons, and multipolygons instantly rendered on an interactive map.
  • Supports zoom, pan, and inspection of feature properties.
• Validator
  • Checks syntax (valid JSON structure).
  • Confirms GeoJSON compliance (Feature, FeatureCollection, Geometry types).
  • Detects invalid coordinate ranges (lat/long out of bounds).
  • Flags missing or malformed fields.

Extra features include:

• Beautify or minify GeoJSON text.
• Copy, download, print, or share results.
• Autosave for the last session.
• Sample datasets (points, polygons, routes) for quick testing.

Authoritativeness

The tool follows the RFC 7946 GeoJSON specification and aligns with standards used by mapping platforms like Leaflet, Mapbox, and OpenLayers. By providing both validation and live map visualization, it helps users catch errors early and build trust in their datasets. This dual approach makes the tool more authoritative than single-purpose validators.

Trustworthiness

All processing runs entirely in your browser. Your spatial data never leaves your device. Interactive messages explain validation results clearly (e.g., “Polygon missing closing coordinate” or “Longitude out of range”). The viewer uses an embedded map engine so you can visually confirm that your data looks correct.

With colorful buttons, pastel feature cards, and a responsive design, the interface feels professional yet approachable. Autosave remembers your last file, so you can continue where you left off.

Key Benefits

• Validate GeoJSON syntax and specification compliance.
• Render data on an interactive map for visual confirmation.
• Inspect feature properties with a click.
• Support for points, lines, polygons, and collections.
• Export ready with copy, print, download, and share.
• No uploads — runs in your browser securely.

How to Use

1. Paste, upload, or drag and drop your GeoJSON file.
2. Use Validate to check syntax and compliance.
3. Switch to the Viewer to see your data on the map.
4. Inspect properties and fix issues if flagged.
5. Export cleaned GeoJSON or share results.

Use Cases

• Developers: Debug API outputs for mapping apps.
• GIS Analysts: Validate datasets before importing into QGIS or ArcGIS.
• Educators: Teach students about GeoJSON structure.
• Planners: Share spatial boundaries with accurate formatting.

FAQs

Q1. What is GeoJSON used for?
GeoJSON encodes spatial features like points, lines, and polygons for use in maps and APIs.

Q2. Can it fix invalid GeoJSON?
It points out errors and formatting issues, but manual fixes may be needed.

Q3. Does it support very large files?
Yes, for typical datasets. For very large ones, split into smaller files.

Q4. Is my data safe?
Yes. Everything is processed in your browser only.

Q5. What coordinate ranges are valid?
Longitude must be between -180 and 180, latitude between -90 and 90.