Request objects

The request object specifies the following properties:

  • arangoUser: string | null

    The authenticated ArangoDB username used to make the request. This value is only set if authentication is enabled in ArangoDB and the request set an authorization header ArangoDB was able to verify. You are strongly encouraged to implement your own authentication logic for your own services but this property can be useful if you need to integrate with ArangoDB's own authentication mechanisms.

  • arangoVersion: number

    The numeric value of the x-arango-version header or the numeric version of the ArangoDB server (e.g. 30102 for version 3.1.2) if no valid header was provided.

  • baseUrl: string

    Root-relative base URL of the service, i.e. the prefix "/_db/" followed by the value of database.

  • body: any

    The processed and validated request body for the current route. If no body has been defined for the current route, the value will be identical to rawBody.

    For details on how request bodies can be processed and validated by Foxx see the body method of the endpoint object.

  • context: Context

    The service context in which the router was mounted (rather than the context in which the route was defined).

  • database: string

    The name of the database in which the request is being handled, e.g. "_system".

  • headers: object

    The raw headers object.

    For details on how request headers can be validated by Foxx see the header method of the endpoint object.

  • hostname: string

    The hostname (domain name) indicated in the request headers.

    Defaults to the hostname portion (i.e. excluding the port) of the Host header and falls back to the listening address of the server.

  • method: string

    The HTTP verb used to make the request, e.g. "GET".

  • originalUrl: string

    Root-relative URL of the request, i.e. path followed by the raw query parameters, if any.

  • path: string

    Database-relative path of the request URL (not including the query parameters).

  • pathParams: object

    An object mapping the names of path parameters of the current route to their validated values.

    For details on how path parameters can be validated by Foxx see the pathParam method of the endpoint object.

  • port: number

    The port indicated in the request headers.

    Defaults to the port portion (i.e. excluding the hostname) of the Host header and falls back to the listening port or the appropriate default port (443 for HTTPS or 80 for HTTP, depending on secure) if the header only indicates a hostname.

    If the request was made using a trusted proxy (see trustProxy), this is set to the port portion of the X-Forwarded-Host header (or approriate default port) if present.

  • protocol: string

    The protocol used for the request.

    Defaults to "https" or "http" depending on whether ArangoDB is configured to use SSL or not.

    If the request was made using a trusted proxy (see trustProxy), this is set to the value of the X-Forwarded-Proto header if present.

  • queryParams: object

    An object mapping the names of query parameters of the current route to their validated values.

    For details on how query parameters can be validated by Foxx see the queryParam method of the endpoint object.

  • rawBody: Buffer

    The raw, unparsed, unvalidated request body as a buffer.

  • remoteAddress: string

    The IP of the client that made the request.

    If the request was made using a trusted proxy (see trustProxy), this is set to the first IP listed in the X-Forwarded-For header if present.

  • remoteAddresses: Array<string>

    A list containing the IP addresses used to make the request.

    Defaults to the value of remoteAddress wrapped in an array.

    If the request was made using a trusted proxy (see trustProxy), this is set to the list of IPs specified in the X-Forwarded-For header if present.

  • remotePort: number

    The listening port of the client that made the request.

    If the request was made using a trusted proxy (see trustProxy), this is set to the port specified in the X-Forwarded-Port header if present.

  • secure: boolean

    Whether the request was made over a secure connection (i.e. HTTPS).

    This is set to false when protocol is "http" and true when protocol is "https".

  • suffix: string

    The trailing path relative to the current route if the current route ends in a wildcard.

  • trustProxy: boolean

    Indicates whether the request was made using a trusted proxy. If the origin server's address was specified in the ArangoDB configuration using --frontend.trusted-proxy or the service's trustProxy setting is enabled, this will be true, otherwise it will be false.

  • url: string

    The URL of the request.

  • xhr: boolean

    Whether the request indicates it was made within a browser using AJAX.

    This is set to true if the X-Requested-With header is present and is a case-insensitive match for the value "xmlhttprequest".

    Note that this value does not guarantee whether the request was made from inside a browser or whether AJAX was used and is merely a convention established by JavaScript frameworks like jQuery.

accepts

req.accepts(types): string | false

req.accepts(...types): string | false

req.acceptsCharsets(charsets): string | false

req.acceptsCharsets(...charsets): string | false

req.acceptsEncodings(encodings): string | false

req.acceptsEncodings(...encodings): string | false

req.acceptsLanguages(languages): string | false

req.acceptsLanguages(...languages): string | false

These methods wrap the corresponding content negotiation methods of the accepts module for the current request.

Examples

if (req.accepts(['json', 'html']) === 'html') {
  // Client explicitly prefers HTML over JSON
  res.write('<h1>Client prefers HTML</h1>');
} else {
  // Otherwise just send JSON
  res.json({success: true});
}

req.cookie(name, options): string | null

Gets the value of a cookie by name.

Arguments

  • name: string

    Name of the cookie.

  • options: object (optional)

    An object with any of the following properties:

    • secret: string (optional)

      Secret that was used to sign the cookie.

      If a secret is specified, the cookie's signature is expected to be present in a second cookie with the same name and the suffix .sig. Otherwise the signature (if present) will be ignored.

    • algorithm: string (Default: "sha256")

      Algorithm that was used to sign the cookie.

If a string is passed instead of an options object it will be interpreted as the secret option.

Returns the value of the cookie or null if the cookie is not set or its signature is invalid.

get / header

req.get(name): string

req.header(name): string

Gets the value of a header by name. You can validate request headers using the header method of the endpoint.

Arguments

  • name: string

    Name of the header.

Returns the header value.

is

req.is(types): string

req.is(...types): string

This method wraps the (request body) content type detection method of the type-is module for the current request.

Examples

const type = req.is('html', 'application/xml', 'application/*+xml');
if (type === false) { // no match
  handleDefault(req.rawBody);
} else if (type === 'html') {
  handleHtml(req.rawBody);
} else { // is XML
  handleXml(req.rawBody);
}

json

req.json(): any

Attempts to parse the raw request body as JSON and returns the result.

It is generally more useful to define a request body on the endpoint and use the req.body property instead.

Returns undefined if the request body is empty. May throw a SyntaxError if the body could not be parsed.

makeAbsolute

req.makeAbsolute(path, [query]): string

Resolves the given path relative to the req.context.service's mount path to a full URL.

Arguments

  • path: string

    The path to resovle.

  • query: string | object

    A string or object with query parameters to add to the URL.

Returns the formatted absolute URL.

params

req.param(name): any

Arguments

Looks up a parameter by name, preferring pathParams over queryParams.

It's probably better style to use the req.pathParams or req.queryParams objects directly.

  • name: string

    Name of the parameter.

Returns the (validated) value of the parameter.

range

req.range([size]): Ranges | number

This method wraps the range header parsing method of the range-parser module for the current request.

Arguments

  • size: number (Default: Infinity)

    Length of the satisfiable range (e.g. number of bytes in the full response). If present, ranges exceeding the size will be considered unsatisfiable.

Returns undefined if the Range header is absent, -2 if the header is present but malformed, -1 if the range is invalid (e.g. start offset is larger than end offset) or unsatisfiable for the given size.

Otherwise returns an array of objects with the properties start and end values for each range. The array has an additional property type indicating the request range type.

Examples

console.log(req.headers.range); // "bytes=40-80"
const ranges = req.range(100);
console.log(ranges); // [{start: 40, end: 80}]
console.log(ranges.type); // "bytes"

reverse

req.reverse(name, [params]): string

Looks up the URL of a named route for the given parameters.

Arguments

  • name: string

    Name of the route to look up.

  • params: object (optional)

    An object containing values for the (path or query) parameters of the route.

Returns the URL of the route for the given parameters.

Examples

router.get('/items/:id', function (req, res) {
  /* ... */
}, 'getItemById');

router.post('/items', function (req, res) {
  // ...
  const url = req.reverse('getItemById', {id: createdItem._key});
  res.set('location', req.makeAbsolute(url));
});