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Unfortunately you can't create an objects (metadata (https://developer.salesforce.com/docs/atlas.en-us.api_meta.meta/api_meta/)) through REST API. If you are looking for solution to create multiple records, then check this link for sample json format -https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/dome_composite_sobject_tree_flat.htm