Reject reserved names in morgan.token() - #385
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Registering a token named token/format/compile overwrote morgan's own API methods because tokens are stored on the export object. Throw a TypeError instead, document the reserved names, and add regression tests. Fixes expressjs#265 Signed-off-by: JAYA DILEEP <seethinajayadileep@hotmail.com>
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September 6, 2026 04:28
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Summary
morgan.token()stores callbacks on the morgan export object. Registering a token namedtoken,format, orcompiletherefore overwrote morgan's own API methods. Aftermorgan.token('token', ...), latermorgan.token(...)calls failed withTypeError: ... is not a function, which matches issue #265.Per maintainer guidance on that issue, 1.x should reject those reserved names with a clear error (and document them). Allowing arbitrary names is left for a future 2.0 redesign.
Changes
TypeErrorwhen registering a reserved token namemorgan.tokenusable after a rejected registration)Test plan
./node_modules/.bin/mocha --exit test/morgan.js(96 pass)NO_COLOR=1 ./node_modules/.bin/mocha --exit test/noColor.js(6 pass)Fixes #265