Setup

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Getting Started with SDKs

1

SDK Type

Choose client-side or server-side—e.g., web apps may need both for SSR.

Client-Side

For single-user contexts (e.g., web/mobile apps).

Server-Side

For multi-user contexts (e.g., web servers, APIs).

2

Framework Support

FlagSync supports JavaScript in various forms:

JavaScript

React

Node.js

Next.js

Nest.js

Contact FlagSync Support for other languages.

3

Security

Use client-side SDK keys for web/mobile apps; keep server-side keys private to protect sensitive flag rules.

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Initialization

• SDK initialization happens asynchronously—response time, usually 30-50 milliseconds, depends on flag count and ruleset complexity.
• Use a singleton pattern to avoid memory leaks—SDKs like Nest.js handle this automatically; others require manual setup.

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Next Steps

• Learn SDK differences in Types.
• Understand evaluation in Flag Evaluation.
• Start with Quickstart: SDK.