module uuid

The uuid module provides creation of unique ids. It can be used to generate UUID (Universally Unique Identifier) ​​that meets various requirements

uuidThe module provides multiple static functions that can be used to configure and generate different kinds of UUIDs. The following is an example of using md5 to create a uuid:

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const uuid = require('uuid');
const ns = uuid.DNS;
const name = 'example.com';
console.log(uuid.md5(ns, name));

In the above example, the uuid module is first introduced, then the namespace and name are specified, and a UUID that meets the requirements is generated through the md5 algorithm and output to the console. Similarly, we can also use the snowflake algorithm to generate uuid. The following is an example of using the snowflake algorithm to create a uuid:

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const uuid = require('uuid');
const s = uuid.snowflake();
console.log(s);

In the above example, the snowflake() method returns aBufferObject, which can be converted to a string and output to the console to obtain the generated uuid.

static function

node

Create uuid using time and hostname

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static Buffer uuid.node();

Return results:

• Buffer, returns a generated binary id

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md5

Create uuid using specifically named md5

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static Buffer uuid.md5(Integer ns,
    String name);

Call parameters:

• ns: Integer, specifies the namespace, which can beuuid.DNS,uuid.URL,uuid.OID,uuid.X509
• name: String, specify name

Return results:

• Buffer, returns a generated binary id

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random

Create uuid using random number

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static Buffer uuid.random();

Return results:

• Buffer, returns a generated binary id

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sha1

Create uuid using specifically named sha1

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static Buffer uuid.sha1(Integer ns,
    String name);

Call parameters:

• ns: Integer, specifies the namespace, which can beuuid.DNS,uuid.URL,uuid.OID,uuid.X509
• name: String, specify name

Return results:

• Buffer, returns a generated binary id

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snowflake

Create uuid using Snowflake algorithm

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static Buffer uuid.snowflake();

Return results:

• Buffer, returns a generated binary id

static properties

hostID

Integer, query and modify the host id of the Snowflake algorithm

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static Integer uuid.hostID;

constant

DNS

md5 and sha1 specify name when creating uuid and name it as domain name

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const uuid.DNS = 0;

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URL

md5 and sha1 specify name when creating uuid and name it asurladdress

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const uuid.URL = 1;

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OID

md5 and sha1 specify name when creating uuid and name it as ISO OID

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const uuid.OID = 2;

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X509

md5 and sha1 specify name when creating uuid and name it X.500 DN

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const uuid.X509 = 3;