This is the official JavaScript/TypeScript SDK for the Algorand blockchain, version 3.7.0. It provides a comprehensive set of tools for constructing, signing, encoding, and submitting transactions to Algorand nodes, as well as querying blockchain state via the Algod v2, Indexer, and KMD APIs. The SDK supports all transaction types (payment, asset management, application calls, key registration, state proofs, heartbeats), atomic transaction groups, ABI encoding/decoding for smart contract interactions, logic signatures (escrow, delegation, multisig), and post-quantum Falcon-1024 signatures. It is designed for both Node.js and browser environments, with CommonJS, ESM, and webpack bundle outputs. The architecture is modular: a core encoding layer (schema-based msgpack/JSON serialization) underpins all data types; a client layer abstracts HTTP communication with token-based authentication; a transaction builder pattern provides ergonomic construction; and a signer abstraction decouples signing logic from transaction assembly. Key entry points include the `Algodv2`, `Indexer`, and `Kmd` client classes, the `Transaction` class, `AtomicTransactionComposer` for atomic groups, and the `LogicSig`/`LogicSigAccount` classes. Data flows involve constructing transactions, signing them (via raw keys, multisig, or external signers), encoding to msgpack, and submitting to the network. The SDK also handles decoding of responses, including complex structures like block headers, state deltas, and simulation results. External dependencies include the `algorand-msgpack` package for msgpack encoding, `@algorandfoundation/falcon-wasm` for post-quantum signatures, and `hi-base32` for address encoding. The SDK is extensively tested with unit tests (Mocha), integration tests (Cucumber with mock servers), and browser tests (Selenium). It is actively maintained with regular releases, automated code generation from Algorand API specifications, and CI/CD pipelines for linting, testing, and publishing.