API Development Services: Complete Guide India 2025

APIs connect your software to the world — mobile apps, partner integrations, payment gateways, and third-party services. A poorly designed API creates technical debt that compounds with every consumer added.

Part of our Custom Software Development Complete Guide.

API Types Comparison

Type	Protocol	Best For	Strengths
REST	HTTP/JSON	Web & mobile APIs	Universal compatibility, caching
GraphQL	HTTP/JSON	Flexible data fetching	Client controls response shape
gRPC	HTTP/2 + Protobuf	Internal microservices	10x faster, strongly typed
WebSocket	TCP	Real-time bidirectional	Live updates, chat
Webhooks	HTTP callbacks	Event notifications	Push vs pull efficiency

REST API Design Principles

Resource-Based URLs

GET    /api/v1/members          → List all members
POST   /api/v1/members          → Create member
GET    /api/v1/members/{id}     → Get specific member
PUT    /api/v1/members/{id}     → Replace member
PATCH  /api/v1/members/{id}     → Update member fields
DELETE /api/v1/members/{id}     → Delete member
GET    /api/v1/members/{id}/commissions  → Member's commissions

HTTP Status Codes

• 200 OK — Success
• 201 Created — Resource created
• 400 Bad Request — Validation error
• 401 Unauthorized — Authentication required
• 403 Forbidden — Insufficient permissions
• 404 Not Found — Resource doesn't exist
• 429 Too Many Requests — Rate limited
• 500 Internal Server Error — Server failure

API Security

Security Layer	Implementation
Authentication	JWT Bearer tokens / API keys
Authorization	Role-based (RBAC) / Attribute-based (ABAC)
Transport	TLS 1.3 mandatory
Input validation	Zod/Joi schema validation
Rate limiting	100–1000 req/min per client
OWASP compliance	Top 10 API security risks addressed

API Versioning Strategies

Strategy	Example	Pros	Cons
URL versioning	/api/v1/, /api/v2/	Clear, easy to route	URL pollution
Header versioning	X-API-Version: 2	Clean URLs	Less discoverable
Query param	?version=2	Simple	Caching issues

Eifasoft standard: URL versioning (/api/v1/) with minimum 12-month deprecation notice before version sunset.

GraphQL for MLM/Complex APIs

For MLM software with complex data requirements:

query GetMemberDashboard($memberId: ID!) {
  member(id: $memberId) {
    id
    name
    rank
    commissions(last: 30, currency: "INR") {
      total
      breakdown { type amount date }
    }
    downline(depth: 3) {
      count
      activeCount
      topPerformers { name rank monthlyEarnings }
    }
  }
}

One query fetches exactly the data the dashboard needs — no over-fetching.

API Documentation (OpenAPI/Swagger)

Every Eifasoft API includes:

• OpenAPI 3.0 spec (auto-generated from code annotations)
• Swagger UI interactive documentation
• Postman collection export
• SDK generation (TypeScript, Python, PHP)

Development Cost

Service	Cost (INR)
REST API (15–25 endpoints)	₹1,00,000 – ₹2,00,000
GraphQL API	₹1,50,000 – ₹3,00,000
API gateway + integration	₹2,00,000 – ₹5,00,000
API platform (enterprise)	₹5,00,000 – ₹15,00,000

FAQ

Q: REST or GraphQL for our mobile app? GraphQL if your mobile app has complex, variable data requirements across different screens. REST if data requirements are well-defined and simple. Most Indian projects use REST for 90% of use cases.

Q: How do you handle API breaking changes? Semantic versioning + changelog + 6–12 month deprecation periods. Never break existing API contracts without a migration path for all consumers.

Q: Do you provide API monitoring? Yes — all Eifasoft APIs include Datadog/CloudWatch API monitoring with latency tracking, error rate alerting, and uptime monitoring.

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