JS script without dependencies to generate a geojson file with a grid for latitude and longitude

grid_lat_lng_geojson.js

var geojson = {};
geojson.type = "FeatureCollection";

var features = [];
const step = 1;
var i=0;
var feature = {};

for(i=-180;i<=180;i=i+step){
    feature = {};
    feature.type = "Feature";

    feature.properties = {};
    feature.properties.title = "Longitude " + i;

    feature.geometry = {};
    feature.geometry.type = "LineString";
    feature.geometry.coordinates = [];
    feature.geometry.coordinates.push([ i, 89 ]);
    feature.geometry.coordinates.push([ i, -89 ]);

    features.push(feature);
}

for (i = -90; i <= 90; i = i+step) {
    feature = {};
    feature.type = "Feature";

    feature.properties = {};
    feature.properties.title = "Latitude " + i;

    feature.geometry = {};
    feature.geometry.type = "LineString";
    feature.geometry.coordinates = [];
    feature.geometry.coordinates.push([ 179, i ]);
    feature.geometry.coordinates.push([ -179, i ]);

    features.push(feature);
}

geojson.features = features;

console.log(JSON.stringify(geojson));