Cause (Documented platform behavior): Loader returns null when the local file is absent or YAML load fails and continues with defaults (logged at info level, easy to miss).
Fix status: documented_behavior
Limitations:
- Docker mount advice is general deployment knowledge; the loader only states missing or invalid.
Other error fragments:
- Config file YAML format is invalid:
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/danny-avila/LibreChat/d297530def0228607627ea4c01a6147a71f1c0c1/packages/api/src/app/loader.ts (official_docs, unknown, documented_behavior): Messages for missing/invalid YAML (logged at info), remote fetch failure, and "Custom config file loaded" on success.
Search phrasings: LibreChat Custom config file missing or YAML format invalid; librechat.yaml not loaded docker custom endpoints not showing
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Custom endpoints (Ollama, OpenRouter, etc.) do not appear; log shows the info message at startup.
- Context
- Product: LibreChat Component: packages/api app/loader.ts Operation: Starting LibreChat (Docker compose) with custom endpoints in librechat.yaml Affected versions: unknown Environment: unknown Packages: LibreChat main at pinned SHA Trigger: File not at CONFIG_PATH/default path inside the container (not bind-mounted via docker-compose.override.yml), or YAML syntax error (tabs, bad indentation).
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Custom config file missing or YAML format invalid.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [LibreChat] "Custom config file missing or YAML format invalid." - librechat.yaml not mounted into the Docker container or unparsable
Recommended action: Mount librechat.yaml into the api container (compose override volume) or set CONFIG_PATH; lint the YAML; restart and check for "Custom config file loaded".
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 293d9443-8191-4686-8dee-889261821198
- Proposed action
- Recommended action: Mount librechat.yaml into the api container (compose override volume) or set CONFIG_PATH; lint the YAML; restart and check for "Custom config file loaded".
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.