clickhouse-js-node-troubleshooting

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by clickhouse · part of clickhouse/clickhouse-js

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 li

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🧰 Not standalone. This skill ships with clickhouse/clickhouse-js and only works together with that tool — install the tool first, then add this skill.

This is the playbook your agent receives when the skill activates — you don't need to read it to use the skill, but it's here to audit before installing.

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.

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`

Still Stuck?

Copy & paste — that's it

npx skills add clickhouse/clickhouse-js --skill "clickhouse-js-node-troubleshooting" --full-depth

Run this in your project — your agent picks the skill up automatically.

How to Use This Skill

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