The short answer
EDI exchanges standardized business documents, often in batches, using established formats like X12 that most large trading partners require. APIs exchange data on request in real time, usually as JSON, with formats defined by each provider. EDI is best for high-volume standardized documents; APIs are best for real-time lookups and modern platforms. Most companies need both.
EDI and APIs compared
| Criteria | EDI | API |
|---|---|---|
| Data format | Standards such as X12 and EDIFACT | Provider-defined, usually JSON or XML |
| Timing | Batch or near-real-time document exchange | Real-time request and response |
| Standardization | Same document types across thousands of partners | Each API is different |
| Typical uses | Orders, ship notices, invoices, schedules | Tracking, inventory lookups, marketplaces, pricing |
| Partner adoption | Required by most large retailers, manufacturers and carriers | Common with marketplaces, SaaS platforms and modern carriers |
Each row contrasts one aspect of the two approaches, using the examples in this article: a purchase order for EDI and a package tracking lookup for an API.
Two ways to exchange business data
Both EDI and APIs let systems exchange data without people re-keying it. They differ in how data is structured, when it moves, and how widely each format is shared.
How EDI works
EDI exchanges complete business documents, such as a purchase order or an invoice, in a standard format. Because thousands of companies use the same standards, a supplier can reuse much of its work across many customers. Documents are usually sent as files over AS2, SFTP or a VAN, either as soon as they are created or in scheduled batches. See how EDI works.
How APIs work
An API lets one system request or send data to another in real time. A shipper’s system can ask a carrier’s tracking API for the current status of a package and get an answer in seconds. APIs are flexible and fast, but each provider designs its own, so every API integration is somewhat unique.
Where each fits best
Use EDI when:
- The partner requires it, as most large retailers, manufacturers and carriers do.
- You exchange high volumes of standardized documents.
- You need consistent processes across many partners.
Use APIs when:
- You need real-time answers, such as inventory availability or shipment status.
- The partner is a marketplace, SaaS platform or modern carrier that offers APIs.
- You are building new digital channels or customer-facing services.
Running both
The practical answer for most organizations is not EDI or APIs but EDI and APIs on one platform. A purchase order can arrive as an EDI 850 from one customer and as a JSON order from a marketplace API, then follow the same validation, ERP posting and monitoring. Status updates can combine EDI 214 messages with carrier tracking APIs.
Keeping business rules in one integration layer, rather than separately for each channel, means adding a new partner or channel is a configuration task rather than a new project.