EDI vs API for order integration: which do you need?
EDI and API are two ways to move an order from one company's system into another's without retyping it. They solve the same problem with different tools, and the right answer depends on who you trade with. There is also a third reality most small distributors live in, where neither is set up and the order shows up as an email.
EDI: standardized document exchange
EDI exchanges structured documents, a purchase order, an invoice, a ship notice, in a fixed standard both partners agree on, usually ANSI X12 in North America. The connection runs over a value-added network or a direct AS2 link, and each trading-partner pair is mapped and tested. EDI is mature, reliable, and often mandated by large retailers as a condition of doing business. Its cost lives in setup: standing up a partner connection takes time and money, and you pay to add each new one.
API: real-time app-to-app
An API connects two applications directly over the web, usually with modern REST calls and JSON. When a system supports one, orders can flow in real time with rich, flexible data. The trade-off is development: someone has to build the integration, handle authentication and errors, and maintain it as either side changes. APIs shine when you control both systems or a platform offers a well-documented one and you have engineers to use it.
Side by side
| EDI | API | |
|---|---|---|
| Format | Standardized documents (X12) | Flexible, real-time (REST/JSON) |
| Setup | Per-partner mapping, VAN or AS2 | Custom development |
| Maturity | Decades, retail-mandated | Modern, platform-dependent |
| Best when | Large, steady trading partners | You control both systems |
| Main cost | Setup and per-partner fees | Developer time to build and maintain |
The third option most distributors actually use
EDI and API both assume both sides invested in a connection. A large share of orders come from customers who did neither. Those orders arrive as a PDF by email, and someone keys them in by hand. For a distributor with a long tail of smaller accounts, that email volume can outweigh everything flowing through EDI. You do not need to build EDI or an API to handle it: a parsing tool like SideQuest reads the emailed PO, matches each line to your QuickBooks catalog, and drafts the order for review. More on that gap is in when EDI orders arrive by email.
FAQ
What is the difference between EDI and API?
EDI exchanges standardized documents between two mapped trading partners, often over a VAN. An API connects two applications directly and in real time over the web. EDI is the mature retail-mandated standard; APIs are more flexible and modern but require development.
Should I use EDI or API for orders?
Use EDI when a large partner requires it or you exchange steady high volumes with a few partners. Use an API when you control both systems and have developers. For the long tail of smaller customers who use neither, orders arrive by email and are handled manually or with a parsing tool.
What if my customers use neither?
Most smaller customers send a PDF by email, and someone keys it in by hand. A parsing tool like SideQuest reads the emailed PO, matches the lines to your QuickBooks catalog, and drafts the order, so you do not need EDI or an API to stop retyping those orders.
SideQuest turns the emailed PO into a draft QuickBooks Estimate, no connection to build. 25 POs a month free, no credit card.
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