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API

API ka full form commonly “Application Programming Interface” maana jata hai (Not confirmed as a…

Overview
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API — Quick Facts

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Field: Value

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Type: Software interface / contract

Primary use: Systems ko integrate karna (apps,…

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Common building blocks: Endpoints, requests, responses,…

Topic 1
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Overview

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Client ko bas contract pata ho.

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Server contract follow karke…

Dono independently evolve kar…

Topic 2
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Why APIs exist

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Integration easy hoti hai (mobile…

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Responsibilities separate hoti…

Reuse possible hota hai (same…

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Automation aur tooling easy hoti…

Topic 3
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How APIs work (beginner)

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Client request bhejta hai (kya…

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Server request validate karta hai…

Server processing karta hai…

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Server response bhejta hai (data +…

Topic 4

Types of APIs

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Public API: external developers…

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Partner API: limited partners ke…

Private/internal API: organization…

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API styles (REST, GraphQL, gRPC)

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REST: resource-oriented endpoints…

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GraphQL: client-driven queries;…

gRPC: strongly-typed remote calls;…

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Key components

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Endpoint naming (consistent)

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Methods/operations (what actions)

Data model (what fields)

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Error model (how failures look)

Topic 7
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Security and privacy

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Deny by default: permission clear…

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Validate everything: inputs,…

Least privilege: token ko minimum…

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Secrets safe: keys/tokens codebase…

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Performance considerations

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Serialization cost (JSON etc.)…

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Network latency

Caching strategy

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Pagination for large lists

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Documentation and lifecycle

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Clear endpoints + examples…

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Change management (versioning,…

Observability readiness…

Topic 10
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Common mistakes

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Breaking changes bina versioning

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Inconsistent error format

No authZ rules

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No rate limiting

Topic 11

Comparison: REST vs GraphQL vs gRPC (conceptual)

🎯 Offline constraints ki wajah se table conceptual hai. | Dimension | REST | GraphQL | gRPC…
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Glossary

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API: software contract/interface.

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Client: consumer app/service.

Server: provider app/service.

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Request: input message.

Comparison

Comparison: REST vs GraphQL vs gRPC (conceptual)

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Mental model: Resources

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Typical transport: HTTP (conceptual)

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Strength: Simple + cache-friendly…

Diagram
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Visual Flow

📊 Diagram visualization — details in narration
Related Topics

See Also

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HTTP

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URL

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JSON

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Microservices

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Authentication

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Authorization

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 1

API ka sabse sahi definition kya hai?

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 2

API ka 'Type' kya hai?

Complete! 🎉
COMPLETE

API Complete!

Aliens Wiki · HIEN · Cinematic Knowledge

API Complete

➡️

HTTP

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