If enabled, the maxAge option should also be specified to enable caching. Let client errors fall-through as unhandled requests, otherwise forward a client error.Įnable or disable the immutable directive in the Cache-Control response header. Sets file extension fallbacks: If a file is not found, search for files with the specified extensions and serve the first one found. NOTE: express.static always sends weak ETags. The following table describes the properties of the options object.ĭetermines how dotfiles (files or directories that begin with a dot “.”) are treated. To move on to the next middleware, allowing for stacking and fall-backs. When a file is not found, instead of sending a 404 response, it instead calls next() The function determines the file to serve by combining req.url with the provided root directory. The root argument specifies the root directory from which to serve static assets. NOTE: For best results, use a reverse proxy cache to improve performance of serving static assets. The optional options parameter specifies the behavior of the router. If a function, the type option is called as fn(req) and the request is parsed if it returns a truthy value.Ĭreates a new router object. If not a function, type option is passed directly to the type-is library and this can be an extension name (like bin), a mime type (like application/octet-stream), or a mime type with a wildcard (like */* or application/*). This option can be a string, array of strings, or a function. This is used to determine what media type the middleware will parse. That req.body is a Buffer before calling buffer methods is recommended. Stacking multiple parsers req.body may be from a different parser. The parsing can be aborted by throwing an error.įor example, () may fail in multiple ways, for example This option, if supplied, is called as verify(req, res, buf, encoding), where buf is a Buffer of the raw request body and encoding is the encoding of the request. If a function, the type option is called as fn(req) and the request is parsed if it returns a truthy value. If not a function, type option is passed directly to the type-is library and this can be an extension name (like json), a mime type (like application/json), or a mime type with a wildcard (like */* or */json). You can find more information on this argument in the MDN documentation about JSON.parse.Įnables or disables only accepting arrays and objects when disabled will accept anything JSON.parse accepts. The reviver option is passed directly to JSON.parse as the second argument. If this is a number, then the value specifies the number of bytes if it is a string, the value is passed to the bytes library for parsing. PropertyĮnables or disables handling deflated (compressed) bodies when disabled, deflated bodies are rejected.Ĭontrols the maximum request body size. The following table describes the properties of the optional options object. Values in this object are untrusted and should be validated before trusting.įor example, () may fail in multiple ways, for exampleįoo may not be there or may not be a string, and toString may not be aįunction and instead a string or other user-input. As req.body’s shape is based on user-controlled input, all properties and
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