Resolver.constructor constructor | Node.js dns/promises module | Bun

Resolver.constructor constructor | Node.js dns/promises module | BunBuildDocsReferenceGuidesBlogDiscord/node:dns/promises/Resolver/constructorCoconstructor

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constructor

dns.promises.Resolver.constructorNot implemented in Bun

constructor Resolver(options?: ResolverOptions): Resolver;Referenced typesinterface ResolverOptionsmaxTimeout?: number

The max retry timeout, in milliseconds.

timeout?: number

Query timeout in milliseconds, or -1 to use the default timeout.

tries?: number

The number of tries the resolver will try contacting each name server before giving up.

{ // ... }); // Alternatively, the same code can be written using async-await style. (async function() { const addresses = await resolver.resolve4('example.org'); })(); ``` The following methods from the `dnsPromises` API are available: * `resolver.getServers()` * `resolver.resolve()` * `resolver.resolve4()` * `resolver.resolve6()` * `resolver.resolveAny()` * `resolver.resolveCaa()` * `resolver.resolveCname()` * `resolver.resolveMx()` * `resolver.resolveNaptr()` * `resolver.resolveNs()` * `resolver.resolvePtr()` * `resolver.resolveSoa()` * `resolver.resolveSrv()` * `resolver.resolveTxt()` * `resolver.reverse()` * `resolver.setServers()`" data-algolia-static="false" data-algolia-merged="false" data-type="Class">class Resolver

An independent resolver for DNS requests.

Creating a new resolver uses the default server settings. Setting the servers used for a resolver using resolver.setServers() does not affect other resolvers:

import { promises } from 'node:dns';
const resolver = new promises.Resolver();
resolver.setServers(['4.4.4.4']);

// This request will use the server at 4.4.4.4, independent of global settings.
resolver.resolve4('example.org').then((addresses) => {
// ...
});

// Alternatively, the same code can be written using async-await style.
(async function() {
const addresses = await resolver.resolve4('example.org');
})();

The following methods from the dnsPromises API are available:

resolver.getServers()resolver.resolve()resolver.resolve4()resolver.resolve6()resolver.resolveAny()resolver.resolveCaa()resolver.resolveCname()resolver.resolveMx()resolver.resolveNaptr()resolver.resolveNs()resolver.resolvePtr()resolver.resolveSoa()resolver.resolveSrv()resolver.resolveTxt()resolver.reverse()resolver.setServers()

getServers: () => string[]resolve: {(hostname: string) => Promisestring[]>; (hostname: string, rrtype: 'A' | 'AAAA' | 'CNAME' | 'NS' | 'PTR') => Promisestring[]>; (hostname: string, rrtype: 'ANY') => PromiseAnyRecord[]>; (hostname: string, rrtype: 'CAA') => PromiseCaaRecord[]>; (hostname: string, rrtype: 'MX') => PromiseMxRecord[]>; (hostname: string, rrtype: 'NAPTR') => PromiseNaptrRecord[]>; (hostname: string, rrtype: 'SOA') => PromiseSoaRecord>; (hostname: string, rrtype: 'SRV') => PromiseSrvRecord[]>; (hostname: string, rrtype: 'TLSA') => PromiseTlsaRecord[]>; (hostname: string, rrtype: 'TXT') => Promisestring[][]>; (hostname: string, rrtype: string) => Promisestring[] | SoaRecord | AnyRecord[] | CaaRecord[] | MxRecord[] | NaptrRecord[] | SrvRecord[] | TlsaRecord[] | string[][]>}resolve4: {(hostname: string) => Promisestring[]>; (hostname: string, options: ResolveWithTtlOptions) => PromiseRecordWithTtl[]>; (hostname: string, options: ResolveOptions) => Promisestring[] | RecordWithTtl[]>}resolve6: {(hostname: string) => Promisestring[]>; (hostname: string, options: ResolveWithTtlOptions) => PromiseRecordWithTtl[]>; (hostname: string, options: ResolveOptions) => Promisestring[] | RecordWithTtl[]>}resolveAny: (hostname: string) => PromiseAnyRecord[]>resolveCaa: (hostname: string) => PromiseCaaRecord[]>resolveCname: (hostname: string) => Promisestring[]>resolveMx: (hostname: string) => PromiseMxRecord[]>resolveNaptr: (hostname: string) => PromiseNaptrRecord[]>resolveNs: (hostname: string) => Promisestring[]>resolvePtr: (hostname: string) => Promisestring[]>resolveSoa: (hostname: string) => PromiseSoaRecord>resolveSrv: (hostname: string) => PromiseSrvRecord[]>resolveTlsa: (hostname: string) => PromiseTlsaRecord[]>resolveTxt: (hostname: string) => Promisestring[][]>reverse: (ip: string) => Promisestring[]>setServers: (servers: readonly string[]) => voidcancel(): void;

Cancel all outstanding DNS queries made by this resolver. The corresponding callbacks will be called with an error with code ECANCELLED.

setLocalAddress(ipv4?: string,ipv6?: string): void;

The resolver instance will send its requests from the specified IP address. This allows programs to specify outbound interfaces when used on multi-homed systems.

If a v4 or v6 address is not specified, it is set to the default and the operating system will choose a local address automatically.

The resolver will use the v4 local address when making requests to IPv4 DNS servers, and the v6 local address when making requests to IPv6 DNS servers. The rrtype of resolution requests has no impact on the local address used.

@param ipv4

A string representation of an IPv4 address.

@param ipv6

A string representation of an IPv6 address.

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