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Atlas Whoff
Atlas Whoff

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API Versioning Strategies: URL Path, Headers, and Query Parameters Compared

#typescript #node #api #webdev

API Versioning Strategies: URL Path, Headers, and Query Parameters Compared

Breaking changes in APIs break clients. Versioning lets you evolve safely.
Here are the main strategies with their real trade-offs.

Why Version at All

Without versioning: every breaking change breaks all clients immediately.
With versioning: old clients keep working, new clients use the new version.

Strategy 1: URL Path Versioning 

GET /v1/users
GET /v2/users
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// Express
app.use('/v1', v1Router)
app.use('/v2', v2Router)

// Next.js App Router
// app/api/v1/users/route.ts
// app/api/v2/users/route.ts
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Pros: Explicit, easy to test in browser, cacheable, easy to deprecate.
Cons: URL changes, clients must update base URL.

Most common choice — used by Stripe, Twilio, GitHub.

Strategy 2: Header Versioning 

GET /users
Accept: application/vnd.myapi.v2+json
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Or a custom header:

GET /users
API-Version: 2
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app.get('/users', (req, res) => {
  const version = req.headers['api-version'] ?? '1'

  if (version === '2') {
    return res.json(getUsersV2())
  }
  return res.json(getUsersV1())
})
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Pros: Clean URLs, REST-purist approach.
Cons: Harder to test, not cacheable by default, easy to forget.

Strategy 3: Query Parameter 

GET /users?version=2
GET /users?api-version=2024-01-01
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app.get('/users', (req, res) => {
  const version = req.query.version ?? '1'
  return res.json(version === '2' ? getUsersV2() : getUsersV1())
})
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Pros: Easy to test, visible in browser.
Cons: Pollutes query string, cache invalidation complexity.

Practical Implementation (Next.js) 

// lib/api-version.ts
export function getApiVersion(request: Request): number {
  const url = new URL(request.url)

  // From URL path: /api/v2/...
  const pathMatch = url.pathname.match(/\/api\/v(\d+)\//)
  if (pathMatch) return parseInt(pathMatch[1])

  // From header
  const header = request.headers.get('api-version')
  if (header) return parseInt(header)

  return 1  // default
}

// app/api/v1/users/route.ts
export async function GET() {
  const users = await db.user.findMany({
    select: { id: true, name: true, email: true },
  })
  return Response.json({ users })
}

// app/api/v2/users/route.ts — adds pagination
export async function GET(request: Request) {
  const { searchParams } = new URL(request.url)
  const page = parseInt(searchParams.get('page') ?? '1')
  const limit = parseInt(searchParams.get('limit') ?? '20')

  const [users, total] = await Promise.all([
    db.user.findMany({ skip: (page - 1) * limit, take: limit }),
    db.user.count(),
  ])

  return Response.json({ users, pagination: { page, limit, total } })
}
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Sunset Headers 

// Notify clients that v1 is deprecated
app.use('/v1', (req, res, next) => {
  res.setHeader('Sunset', 'Sat, 01 Jan 2027 00:00:00 GMT')
  res.setHeader('Deprecation', 'true')
  res.setHeader('Link', '</v2/docs>; rel="successor-version"')
  next()
})
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Stripe's Approach (Date-Based)

Stripe versions by date: 2024-01-01. Every account is pinned to a version.
Changes only affect accounts that opt in.

Complex to implement but ideal for high-stakes APIs with many clients.

My Default

URL path versioning (/v1/, /v2/) for most APIs. Simple, explicit, cacheable.
Date-based versioning only when you have enterprise clients who can't tolerate surprises.

The Ship Fast Skill Pack includes an /api skill that scaffolds versioned API routes with validation and tests. $49 one-time.

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