GeoJSON Validator

Validate GeoJSON and automatically fix invalid geometries. Like geojsonhint, but with geometry checks & fixes!

• 🔴 Detects invalid geometries & 🟢 fixes them : Unclosed, wrong winding order etc.
• 🟨 Problematic geometries (for many tools & APIs): Self-intersection, crossing anti-meridian etc.
• Checks 🧬 structure according to GeoJSON specification
• Use Website or Python package

🎈 geojson-validator.streamlit.app in the Browser 🎈

Also see the geojson-invalid-geometry list for detailed explanations of all possible GeoJSON issues.

Quickstart Python

# Installation
pip install geojson-validator

Data input can be any type of GeoJSON object, a filepath/url, and anything with a __geo_interface__ (shapely, geopandas etc.).

import geojson_validator

geojson_input = {'type': 'FeatureCollection',
                 'features': [{'type': 'Feature', 'geometry':
                     {'type': 'Point', 'coordinates': [-59.758285, 8.367035]}}]}

geojson_validator.validate_structure(geojson_input)
geojson_validator.validate_geometries(geojson_input)
geojson_validator.fix_geometries(geojson_input)

1. Validate GeoJSON structure 🧬

Checks the structure & formatting of the GeoJSON, e.g. required elements, data & geometry types, coordinate array depth etc.

geojson_validator.validate_structure(geojson_input, check_crs=False)

Returns the reasons why the input does not conform to the GeoJSON specification. Also gives the JSON path and feature index to more quickly localize the issues. Example: {"Missing 'type' member": {"path": ["/features/0"], "feature": [0]}}.

2. Validate geometries 🟥

Checks the GeoJSON geometry objects for inconsistencies and geometric issues. See geojson-invalid-geometry for a detailed description of all invalid and problematic criteria. You can choose to validate only specific criteria, by default all are selected.

# Invalid according to the GeoJSON specification
criteria_invalid = ["unclosed", "less_three_unique_nodes", "exterior_not_ccw",
                    "interior_not_cw"]

# Problematic with some tools & APIs
criteria_problematic = ["holes", "inner_and_exterior_ring_intersect", "self_intersection",
                        "duplicate_nodes", "excessive_coordinate_precision", "excessive_vertices",
                        "3d_coordinates", "outside_lat_lon_boundaries", "crosses_antimeridian"]

geojson_validator.validate_geometries(geojson, criteria_invalid, criteria_problematic)

Returns the reasons (example below) and positional indices of the invalid geometries, e.g. features [0, 3]. Also indicates if a sub-geometry of a MultiType geometry make it invalid e.g. {2:[0, 5]}.

{"invalid":
     {"unclosed": [0, 3],
      "exterior_not_ccw": [{2: [0, 5]}]},
 "problematic":
     {"crosses_antimeridian": [1]},
 "count_geometry_types":
     {"Polygon": 3,
      "MultiPolygon": 1},
 "skipped_validation": []}

skipped_validation lists the indices of features that could not be checked, e.g. a null geometry, an unsupported geometry type, or a geometry whose structure is broken. Use validate_structure to find out what is wrong with those. A MultiType geometry is listed if any of its sub-geometries could not be checked, so it can appear both here and under a violated criterium.

3. Fix GeoJSON geometries 🟩

Automatically repairs some of the most common categories of invalid geometries. Always fixes ["unclosed", "exterior_not_ccw", "interior_not_cw"]. Select additional, non-essential fixes with the parameter optional. Currently only Polygon geometries are fixed, other geometry types are left unchanged.

geojson_validator.fix_geometries(geojson_input, optional=["duplicate_nodes"])

The result is a GeoJSON FeatureCollection with the fixed geometries.

FAQ:

• Why not use geojson-pydantic for the structure validation? Its error messages are schema-shaped and hard to act on: a single missing coordinate is reported four times, and the wording usually has to be translated before it can be shown to a non-programmer. This library reports each problem once, in plain language, with the JSON path and feature index.
• Too many logging messages, can I disable them? You can disable or configure the logging behavior via geojson_validator.configure_logging(enabled=True, level="DEBUG") which also returns the logger instance.
• Does it ship type hints? Yes, the package is PEP 561 typed, so mypy/pyright pick up the annotations without extra stubs.