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geojson-validation - npm

A GeoJSON Validation Library
Check JSON objects to see whether or not they are valid GeoJSON. Validation is based off of the GeoJSON Format Specification revision 1.0

const gjv = require("geojson-validation");
 
const validFeatureCollection = {
    "type": "FeatureCollection",
    "features": [
        {
            "type": "Feature",
            "geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
            "properties": {"prop0": "value0"}
        },
        {
            "type": "Feature",
            "geometry": {
                "type": "LineString",
                "coordinates": [
                    [102.0, 0.0], [103.0, 1.0], [104.0, 0.0], [105.0, 1.0]
                ]
            },
            "properties": {
                "prop0": "value0",
                "prop1": 0.0
            }
        }
    ]
};
 
if(gjv.valid(validFeatureCollection)){
    console.log("this is valid GeoJSON!");
}
 
const invalidFeature =  {
    "type": "feature",
    "geometry": {
        "type": "LineString",
        "coordinates": [
            [102.0, 0.0], [103.0, 1.0], [104.0, 0.0], [105.0, 1.0]
        ]
    },
    "properties": {
        "prop0": "value0",
        "prop1": 0.0
    }
};
 
const trace = gjv.isFeature(invalidFeature, true)
console.log(trace)

first install gobally
npm install geojson-validation -g
Then you can use gjv to validate file such as
gjv file1 file2..
Or you can stream files to it cat file | gjv
gjv will either return a list of error or a valid if the files are indeed valid.

All Function return a boolean and take a JSON object that will be evalatued to see if it is a GeoJSON object, with the exception of define.

Define a Custom Validation for the give type. type can be "Feature", "FeatureCollection", "Point", "MultiPoint", "LineString", "MultiLineString", "Polygon", "MultiPolygon", "GeometryCollection", "Bbox", "Position", "GeoJSON" or "GeometryObject".

The function is passed the object being validated and should return a string or an array of strings representing errors. If there are no errors then the function should not return anything or an empty array. See the example for more.

const gjv = require("geojson-validation");
 
gjv.define("Position", (position) => {
    
    errors = [];
    if(position[0] < -180 || position[0] > 180){
        errors.push("the x must be between -180 and 180");
    }
    if(position[1] < -90 || position[1] > 90){
        errors.push("the y must be between -90 and 90");
    }
    return errors;
 
});
 
const gj = {type: "Point", coordinates: [-200,3]};
gjv.isPoint(gj);

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