REST vs SOAP
Differences, use cases, and when to use each
REST is a lightweight architectural style using HTTP and JSON. SOAP is a protocol using XML with strict standards for enterprise services. REST dominates modern web APIs; SOAP persists in enterprise and regulated industries.
Quick Comparison
| Feature | REST | SOAP |
|---|---|---|
| Protocol | Architectural style (not a protocol) | Protocol with strict specification |
| Data Format | JSON (usually) | XML (always) |
| Standards | Loose (conventions only) | Strict (WSDL, WS-*) |
| Error Handling | HTTP status codes | Fault elements in XML envelope |
| Performance | Lightweight | Heavier (XML overhead) |
When to Use Each
When to Use REST
Use REST for new web APIs, mobile backends, public APIs, and microservices. REST's simplicity, JSON support, and wide tooling make it the default choice.
When to Use SOAP
Use SOAP for enterprise integrations, financial services, healthcare (HL7), and systems requiring formal contracts, built-in WS-Security, and ACID-compliant transactions.
Pros & Cons
REST
SOAP
Verdict
REST for new projects. SOAP when enterprise requirements, formal contracts, or regulated industry standards mandate it. You'll rarely choose SOAP for a new project today.