DeepSeek V4 API: The Complete Developer Guide
SMRTR summary
DeepSeek V3 offers GPT-4o-level performance at significantly lower per-token costs, and its OpenAI-compatible API makes integration straightforward for JavaScript developers. This guide covers everything from environment setup and API key configuration to streaming, structured JSON output, retry logic, and building a complete AI-powered code review CLI tool — plus a migration path for teams already using the OpenAI SDK.
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