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The NEAR SDK is a library that allows you to develop smart contracts. Currently, there are two versions of the NEAR SDK: one for Rust and one for JavaScript.
The best place to start learning is our QuickStart Guide.

Rust SDK

Rust SDK reference documentation.

JavaScript SDK

JavaScript SDK reference documentation.

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Smart contracts on NEAR

This is how a smart contract written in Rust and JavaScript using the NEAR SDK looks like: 
@NearBindgen({})
class HelloNear {
  greeting: string = 'Hello';

  @view({}) // This method is read-only and can be called for free
  get_greeting(): string {
    return this.greeting;
  }

  @call({}) // This method changes the state, for which it costs gas
  set_greeting({ greeting }: { greeting: string }): void {
    near.log(`Saving greeting ${greeting}`);
    this.greeting = greeting;
  }
}

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Ready to start developing?

Start from our Smart Contract QuickStart Guide, and let it guide you through all our documentation on building smart contracts.

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Want to see examples?

We have a section dedicated to tutorials and examples that will help you understand diverse use cases and how to implement them.

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Reference docs

If you need to find a specific function signature, or understand the SDK structs and classes, visit the SDK-specific pages: