Middleware (Integration Middleware)
Software that sits between two or more systems, translating and routing data so they can exchange information without a direct, custom-built connection.
How it works — and why it matters
In freight, middleware typically sits between a TMS and the outside world: it accepts an inbound EDI 204 or API call, maps the fields to the TMS's data model, applies partner-specific rules, and routes the result — then does the same in reverse for outbound statuses and invoices.
Without middleware, connecting many systems means building point-to-point integrations for every pair, each one breaking whenever either side changes. A middleware layer reduces that to one connection per system and centralizes mapping, monitoring, and error handling — which is why integration platforms are standard infrastructure in freight technology stacks.