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Fix Node.js fetch Errors: ECONNRESET, UND_ERR_CONNECT_TIMEOUT and "fetch failed"

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Self-Hosting & Infra intermediate 7 min read $0.01 Updated 2026-10-19

Decoding Node.js fetch/undici failures: reading error.cause, ENOTFOUND, ECONNREFUSED, ECONNRESET, UND_ERR_CONNECT_TIMEOUT and UND_ERR_HEADERS_TIMEOUT, IPv6 and happy-eyeballs, keep-alive reuse, proxy settings, certificate errors and AbortSignal timeouts.

Node fetch throws a vague "fetch failed". Read error.cause for the real code, then fix DNS, IPv6, timeouts, keep-alive resets, proxies and TLS.

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#nodejs#fetch#undici#network#timeouts

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