Here is how you can format Scrapy export of your items

For all of these options make sure that your spider actually yields some results in your parse method.

Using a known filename extension

Using one of the known file extensions that you provide in the -O option for the crawl command.

These are json, jsonlines, jl, csv, xml, marshal and pickle

Using the -t option

Provide the format in the -t option for the crawl command.

Accepted formats are the same (json, jsonlines, jl, csv, xml, marshal and pickle )

Using the FEEDS property of the spider

Provide a value to the FEEDS property in your spider

More info

Can be found in the official docs

import scrapy

class MySpider(scrapy.Spider):
    name = "myspider"
    custom_settings = {
        'FEEDS': {
            'export.jsonlines': {       # file URI (name)
                'format': 'jsonlines',  # json/jsonlines/csv/xml/marshal/pickle
            }
        }
    }