index.js

var fs = require('fs');
// Node.js require:
var Ajv = require('ajv');
// or ESM/TypeScript import
//import Ajv from 'ajv';

var GenerateSchema = require('generate-schema')
jsonbody = {"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"Point","coordinates":[102,0.5]},"properties":{"prop0":"value0"}},{"type":"Feature","geometry":{"type":"LineString","coordinates":[[102,0],[103,1],[104,0],[105,1]]},"properties":{"prop0":"value0","prop1":0}},{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[100,0],[101,0],[101,1],[100,1],[100,0]]]},"properties":{"prop0":"value0","prop1":{"this":"that"}}}]};
var schema = GenerateSchema.json(jsonbody);
let data = JSON.stringify(schema);
fs.writeFileSync('json_schema.json', data);

schema = {
    "$id": "http://json-schema.org/draft-04/schema#",
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "Product",
    "type": "object",
    "properties": {
        "type": {
            "type": "string"
        },
        "features": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "type": {
                        "type": "string"
                    },
                    "geometry": {
                        "type": "object",
                        "properties": {
                            "type": {
                                "type": "string"
                            },
                            "coordinates": {
                                "type": "array"
                            }
                        }
                    },
                    "properties": {
                        "type": "object"
                    }
                },
                "required": ["type", "geometry", "properties"]
            }
        }
    }
}

var ajv = new Ajv({schemaId: 'id'});
// If you want to use both draft-04 and draft-06/07 schemas:
// var ajv = new Ajv({schemaId: 'auto'});
ajv.addMetaSchema(require('ajv/lib/refs/json-schema-draft-04.json'));
var validate = ajv.compile(schema);
var valid = validate(jsonbody);
if (!valid) console.log(validate.errors);

json_ok.json

json_schema.json

{"$schema":"http://json-schema.org/draft-04/schema#","type":"object","properties":{"type":{"type":"string"},"features":{"type":"array","items":{"type":"object","properties":{"type":{"type":"string"},"geometry":{"type":"object","properties":{"type":{"type":"string"},"coordinates":{"type":"array","items":{"oneOf":[{"type":"number"},{"type":"number"},{"type":"number"},{"type":"number"},{"type":"number"}],"type":"array"}}}},"properties":{"type":"object","properties":{"prop0":{"type":"string"},"prop1":{"type":"object","properties":{"this":{"type":"string"}}}}}},"required":["type","geometry","properties"]}}}}

package.json

{
  "name": "json-schema-validator-debug",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "ajv": "^6.12.3",
    "generate-schema": "^2.6.0"
  }
}

validation.py

import json
from jsonschema import validate

# ...

def fonction_demo(dict_to_test, dict_valid):
    try:
        validate(dict_to_test, dict_valid)
    except Exception as valid_err:
        print("Validation KO: {}".format(valid_err))
        raise valid_err
    else:
        # Realise votre travail
        print("JSON validé")


if __name__ == '__main__':
    with open("./json_ok.json", "r") as fichier:
        dict_to_test = json.load(fichier)

    with open("./json_schema.json", "r") as fichier:
        dict_valid = json.load(fichier)

    fonction_demo(dict_to_test, dict_valid)

Heterogeneous coordinates with different nesting is the cause of the issue we patched.

With the following no more issues as the array in coordinates is nested the same way between features.

jsonbody = {"type":"FeatureCollection","features":[
{"type":"Feature","geometry":{"type":"Point","coordinates":[103,1]},"properties":{"prop0":"value0","prop1":0}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[100,0]},"properties":{"prop0":"value4","prop1": {"this": "that"}}},
{"type":"Feature","geometry":{"type":"Point","coordinates":[102,0.5]},"properties":{"prop0":"val", "prop1": 2}}
]};