JSON Logger (TypeScript)
item / server / observability
JSON-lines logger with key-suffix secret redaction, an injectable sink, and child loggers for request-scoped fields.
- type
- item
- files
- 2
- registry deps
- none
- npm deps
- none
- env vars
- LOG_LEVEL
installs
- ~/lib/automindz/log-json.ts
- ~/tests/log-json.test.mts
- Injectable sink and env, so the shipped test never touches stdout
- Same redaction rule and key order as the Python twin
- An explicit level beats LOG_LEVEL; an unknown LOG_LEVEL falls back to info
const log = createLogger({ service: "acme-api" }), then log.info("job done", { runId }) or log.error("failed", { runId }, err); log.child({ requestId }) bakes fields into every line. One JSON object per line: ts, level, service, msg, your fields, then err with type, message, stack. Keys ending in key, secret, token, password, authorization or cookie (or equal to auth) are replaced with [redacted] before serialisation, recursively; extend log.redactSuffixes for app-specific names. LOG_LEVEL is read from the env option (default process.env) when the logger is created. Circular and non-plain values are stringified, never thrown. Run the shipped test with node --test tests/log-json.test.mts.
Variations
one state per section
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