REST vs GraphQL vs gRPC

By the Syncfusion DevTutorials team · Last updated October 20, 2026

Start with REST, and pick GraphQL, gRPC, webhooks or Server-Sent Events only when you have a clear reason.

Choosing an API style means selecting the best way for programs to communicate.

Different styles solve different problems:

• REST is simple, widely supported, and great for CRUD operations.
• GraphQL lets clients request exactly the data they need.
• gRPC provides fast communication between services.
• Webhooks let servers notify other servers when something happens.
• Server-Sent Events (SSE) let servers send live updates to web pages.

There is no single best choice for every situation. The best API style depends on the problem you are trying to solve.

Watch a Partner Ask Ten Times

A delivery partner wants to know when order 101 is ready. The only available API is:

GET /orders/101

The partner repeatedly asks: Is it ready yet?

This technique is called polling. Press Run.

Results:

• Ten requests are sent.
• The first nine responses say:

{
  "status": "preparing",
  "changed": false
}

• The tenth response finally says:

{
  "status": "ready",
  "changed": true
}

Statistics:

{
  "requests": 10,
  "useful": 1,
  "wasted": 9
}

Nine requests provided no new information. As the number of partners grows, thousands of unnecessary requests are generated.

In simple words: polling is useful when the client needs information right now, but it can waste resources when the client is only waiting for future changes.

TL;DR

• REST is the default choice for most APIs.
• GraphQL works well when screens need different combinations of data.
• gRPC is ideal for high-performance communication between services.
• Webhooks push events to other servers.
• SSE pushes updates to web pages over HTTP.
• Choose a specialized style only when it clearly solves a problem that REST does not.

A Real-World Example

Think about different ways of transporting something.

REST = Car

A car:

• Works almost everywhere.
• Uses existing roads.
• Is easy for most people.

REST has similar strengths:

• Simple
• Flexible
• Universally supported

gRPC = Train

A train:

• Travels very quickly.
• Carries lots of passengers.
• Requires dedicated infrastructure.

gRPC is similar:

• Very efficient
• Extremely fast
• Requires a shared contract and supporting tools

Webhook or SSE = Courier

A courier delivers information when it is ready. You do not repeatedly visit a shop asking: Is my package ready now?

Instead, the courier contacts you. This is how webhooks and SSE work.

GraphQL = Smart Shopping Trip

GraphQL lets you request exactly what you need in a single trip. No extra items. No unnecessary stops.

What You Will Learn

In this lesson, you will learn:

1. Why polling can waste resources.
2. When REST is the best choice.
3. When GraphQL reduces over-fetching.
4. When gRPC improves performance.
5. How webhooks push events securely.
6. How SSE delivers live updates.
7. How to choose the right style for a problem.

Same Data, Three Ways

Suppose the Brew & Bytes home screen needs:

• Customer name
• Loyalty points
• Two orders
• Featured drink

Let's retrieve that information using three different API styles.

REST

Results:

• 4 calls
• 419 bytes

The screen requests multiple endpoints.

Examples:

GET /customers/me
GET /loyalty/me
GET /orders
GET /featured-drink

The API also sends fields that the screen does not need.

Examples:

{
  "email": "...",
  "calories": 220
}

REST is simple but may return extra data.

GraphQL

Results:

• 1 call
• 157 bytes

GraphQL lets the client specify the exact fields it wants.

Example:

query {
  customer {
    name
    points
  }
}

Only requested fields are returned.

Benefits:

• Fewer requests
• Smaller responses
• Flexible for UI development

gRPC

Results:

• 1 call
• 44 bytes

Instead of JSON, gRPC uses:

Protocol Buffers (protobuf)

Data is encoded in binary format. Field names are not transmitted. Both sides already know the structure from a shared .proto file.

Benefits:

• Small payloads
• Fast serialization
• Efficient network usage

Push Updates to Another Server with Webhooks

Polling repeatedly asks for updates. A webhook reverses the flow. Instead of: Partner → API → Partner → API → Partner → API

the partner supplies a callback URL once. Later, when something happens, the API sends a request to that URL.

Example:

POST https://partner.example/webhook

when an order ships.

Webhook Security

Anyone could try to send fake events.

To prevent this, webhook payloads are signed. Both parties share a secret. The sender computes:

HMAC-SHA256(secret, body)

and includes the result in:

X-Signature

Process:

1. Sender signs the body.
2. Receiver computes its own signature.
3. Signatures are compared.
4. Matching signatures mean the payload is authentic.

If the body changes:

{
  "orderId": 101
}

to:

{
  "orderId": 102
}

the signature no longer matches. The webhook is rejected.

Production Webhook Features

Most webhook systems also include:

• Event IDs
• Retries
• Delivery tracking
• Timestamps
• Replay protection

Examples include GitHub, Stripe, Shopify, and many SaaS platforms.

Push Updates to a Web Page with SSE

Servers can push updates directly to browser pages using: Server-Sent Events (SSE)

Unlike webhooks, browsers do not have public URLs. Instead, the browser keeps one HTTP connection open.

Response:

Content-Type: text/event-stream

Event format:

event: status
id: 1
data: {"status":"preparing"}

The blank line ends the event. Browser code:

const events = new EventSource("/orders/101/events");

events.addEventListener("status", e => {
  console.log(JSON.parse(e.data));
});

Benefits:

• Simple
• Uses normal HTTP
• Automatically reconnects

Good use cases:

• Order tracking
• Notifications
• Monitoring dashboards
• AI response streaming

A Simple Way to Choose

Choose the simplest option that solves the problem.

Public API

Use: REST

Reason:

• Familiar
• Easy to document
• Works everywhere

Admin CRUD Application

Use: REST

Reason:

• Standard resource operations

Mobile Home Screen

Use: GraphQL

Reason:

• Different screens need different data shapes

Internal Payment Service

Use: gRPC

Reason:

• Low latency
• High performance

Hardware Sensor Stream

Use: gRPC

Reason:

• Efficient streaming

Live Order Tracking

Use: SSE

Reason:

• Server pushes updates to the browser

Partner Notifications

Use: Webhook

Reason:

• Server notifies another server

Browser Chat

Use: WebSocket

Reason:

• Two-way communication

Most modern systems combine multiple styles.

Example:

Public API      → REST
Internal APIs   → gRPC
Partner Events  → Webhooks
Live UI Updates → SSE

Long-Running Jobs with 202 Accepted

Some work takes too long to finish during a single request.

Examples:

• Large reports
• Video processing
• Data imports

Do not keep the request open for minutes.

Instead return:

202 Accepted

Start the Job

Request:

POST /reports

Response:

202 Accepted
Location: /jobs/1

Body:

{
  "status": "queued"
}

Check Progress

Request:

GET /jobs/1

Response:

{
  "status": "running"
}

and:

Retry-After: 5

Job Finished

Response:

{
  "status": "done",
  "result": "/reports/1"
}

The report can then be downloaded. For large partner integrations, combine jobs with webhooks so clients do not need to poll repeatedly.

REST vs GraphQL vs gRPC

Where You See This

• Stripe and GitHub provide REST APIs and signed webhooks.
• Shopify and GitHub expose GraphQL APIs.
• Many large companies use gRPC internally between services.
• AI chat applications stream responses using SSE.
• Real-time messaging platforms rely on WebSockets.

Common mistakes

Key takeaway: Start with REST. Move to GraphQL, gRPC, Webhooks, SSE, or WebSockets only when a specific requirement makes them the better choice. REST is the default; the others are specialized tools for specialized problems.

Exercises

What to Remember

• REST is the default. Choose another style only for a reason that you can say in one sentence.
• Use GraphQL for many screen shapes, and gRPC between your own services.
• When clients wait for news, push: webhooks to servers, SSE to pages, and WebSockets for two-way talk.
• Sign webhooks with HMAC-SHA256, and verify them in fixed time.
• Real systems often mix styles, each one where it fits best.

Next: Capstone Project. You will put everything together, and you will build a complete Brew & Bytes API from start to finish.