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name: clickhouse-js-node-troubleshooting description: > Troubleshoot and resolve common issues with the ClickHouse Node.js client (@clickhouse/client). Use this skill whenever a user reports errors, unexpected behavior, or configuration questions involving the Node.js client specifically — including socket hang-up errors, Keep-Alive problems, stream handling issues, data type mismatches, read-only user restrictions, proxy/TLS setup problems, or long-running query timeouts. Trigger even when the user hasn't precisely named the issue; vague symptoms like "my inserts keep failing" or "connection drops randomly" in a Node.js context are strong signals to use this skill. Do NOT use for browser/Web client issues.

ClickHouse Node.js Client Troubleshooting

Reference: https://clickhouse.com/docs/integrations/javascript

⚠️ Node.js runtime only. This skill covers the @clickhouse/client package running in a Node.js runtime exclusively — including Next.js Node runtime API routes, React Server Components, Server Actions, and standard Node.js processes. Do not apply this skill to browser client components, Web Workers, Next.js Edge runtime, Cloudflare Workers, or any usage of @clickhouse/client-web. For browser/edge environments, the correct package is @clickhouse/client-web.

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How to Use This Skill

1. Identify the issue — match symptoms to the Issue Index below and read the corresponding reference file.
2. Lead with the diagnosis — explain what's likely causing the issue before giving the fix.
3. Note version constraints — flag if a fix requires a minimum client version and check it against what the user provided.
4. Ask only what's missing — if the fix is version-dependent and you don't know their version, ask; otherwise help immediately.

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Issue Index

Identify the user's issue from the list below and read the corresponding reference file for detailed troubleshooting steps.

Issue	Symptoms	Reference file
Socket Hang-Up / ECONNRESET	socket hang up, ECONNRESET, intermittent connection drops, long-running queries timing out	reference/socket-hangup.md
Data Type Mismatches	Large integers returned as strings, decimal precision loss, Date/DateTime insertion failures, CANNOT_PARSE_INPUT_ASSERTION_FAILED inserting a UUID into a UInt128 column	reference/data-types.md
Read-Only User Errors	Errors when using response compression with readonly=1 users	reference/readonly-users.md
Proxy / Pathname URL Confusion	Wrong database selected, requests failing behind a proxy with a path prefix	reference/proxy-pathname.md
TLS / Certificate Errors	TLS handshake failures, certificate verification issues, mutual TLS setup	reference/tls.md
Compression Not Working	GZIP compression not activating for requests or responses	reference/compression.md
Logging Not Showing Anything	No log output, need custom logger integration	reference/logging.md
Query Parameters Not Interpolated	Parameterized queries not working, SQL injection concerns	reference/query-params.md
FORMAT Clause / SHOW POLICIES Errors	Syntax error from a duplicate FORMAT, or SHOW [ROW] POLICIES failing even with a format provided	reference/query-format-clause.md

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Still Stuck?

• JS client source + full examples
• ClickHouse JS client docs
• ClickHouse supported formats