Bulk API 2.0 and Bulk API Developer Guide
jSummer '26 (API version 67.0)
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How Bulk API Works
Limits
General Guidelines for Data Loads
Use Compression for Responses
Configure Salesforce CORS Allowlist
Install cURL
Map Data Fields
Bulk API End-of-Life
Glossary
Newer Version Available
Plan Bulk Data Loads
Bulk API performance depends on the type of data that you're loading, as well as any
workflow rules and triggers associated with the objects in your batches. It's useful to
understand the factors that determine optimal loading time.
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General Guidelines for Data Loads
For optimal processing time, consider these tips when planning your data loads. Always test your data loads in a sandbox organization first. Note that the processing times can be different in a production organization. -
Use Compression for Responses
In API version 27.0 and later, Bulk API can compress response data which reduces network traffic and improves response time. -
Configure Salesforce CORS Allowlist
Cross-Origin Resource Sharing (CORS) allows web browsers to request resources from other origins. For example, using CORS, the JavaScript for a web application at https://www.example.com can request a resource from https://www.salesforce.com. To allow access to supported Salesforce APIs, Apex REST resources, and Lightning Out from JavaScript code in a web browser, add the requesting origin to your Salesforce CORS allowlist. For Lightning apps that allow web browsers to make requests from their orgs, CORS allowlist prevents requests to Lightning apps unless the request comes from an approved URL.