REST API vs gRPC vs GraphQL

Modern systems rarely use a single communication protocol everywhere.

Most scalable architectures combine multiple approaches depending on:

• client needs
• performance requirements
• internal vs external traffic
• developer experience
• realtime capability
• data flexibility

This guide compares:

• REST API
• gRPC
• GraphQL

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Quick Comparison

Feature	REST API	gRPC	GraphQL
Protocol	HTTP/1.1 or HTTP/2	HTTP/2	HTTP
Data Format	JSON	Protobuf (binary)	JSON
Performance	Medium	Very Fast	Medium
Type Safety	Weak/Optional	Strong	Strong
Streaming	Limited	Excellent	Possible with subscriptions
Browser Friendly	Excellent	Limited	Excellent
Learning Curve	Easy	Medium	Medium/Hard
Best For	Public APIs	Internal microservices	Flexible frontend APIs
Over-fetching	Common	Minimal	Solved
Under-fetching	Common	Minimal	Solved
Schema Contract	Optional	Required	Required
Mobile Efficiency	Medium	Excellent	Good
Human Readable	Yes	No	Yes
Tooling Ecosystem	Massive	Strong backend tooling	Strong frontend tooling

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REST API

What is REST?

REST (Representational State Transfer) is the traditional HTTP API architecture.

Resources are exposed through endpoints:

GET /users/123
POST /orders
PUT /profile
DELETE /cart/1

Rule of Thumb

Use REST when:

• simplicity matters most
• building public APIs
• CRUD dominates
• broad compatibility is required

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Use gRPC when:

• performance is critical
• services communicate internally
• low latency matters
• strong contracts are important

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Use GraphQL when:

• frontend flexibility matters
• multiple clients need different data
• reducing API roundtrips is important
• building complex UI systems