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This module allows you to generate length-efficient unique IDs, that can be used instead of UUID (v4). The generator uses a limited dictionary space of characters and generates IDs of increasing length to allow for Length-Efficient ids as opposed to UUIDs, that always generate IDs of length 36 or 48 from the getgo.

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Given a dictionary size of M and an required ID length <= n, the generator has an output space of:

This provides very length-efficient IDs even for modest lengths. For example, if you wish to generate IDs of length no greater than 6, then the generator's can output as many as 57,731,386,986 (~57 Billion) unique ids.

• Import the module:

• Instantiate Id Generator:

• Generate Counter-based ID:

• Generate Random ID:

The Crypto.getRandomValues() method lets you get cryptographically strong random values. The array given as the parameter is filled with random numbers (random in its cryptographic meaning).

To guarantee enough performance, implementations are not using a truly random number generator, but they are using a pseudo-random number generator seeded with a value with enough entropy. The PRNG used differs from one implementation to the other but is suitable for cryptographic usages. Implementations are also required to use a seed with enough entropy, like a system-level entropy source. /do-beta-key-generators-work.html.

getRandomValues() is the only member of the Crypto interface which can be used from an insecure context.

Syntax

Parameters

typedArray

An integer-based TypedArray, that is an Int8Array, a Uint8Array, an Int16Array, a Uint16Array, an Int32Array, or a Uint32Array. All elements in the array are overwritten with random numbers.

Return value

The same array passed as typedArrayÂ but with its contents replaced with the newly generated random numbers. Note that typedArray is modified in-place, and no copy is made.

Exceptions

Node Random String

This method can throw an exception under error conditions.

Js Random Int

QuotaExceededError

The requested length exceeds 65,536 bytes.

Usage notes

Don't use getRandomValues() to generate encryption keys. Instead, use the generateKey() method. /how-is-a-session-key-generated.html. There are a few reasons for this; for example, getRandomValues() is not guaranteed to be running in a secure context.

There is no minimum degree of entropy mandated by the Web Cryptography specification. User agents are instead urged to provide the best entropy they can when generating random numbers, using a well-defined, efficient pseudorandom number generator built into the user agent itself, but seeded with values taken from an external source of pseudorandom numbers, such as a platform-specific random number function, the Unix /dev/urandom device, or other source of random or pseudorandom data.

Examples

Specification

Nodejs Generate Random Key

Browser compatibility

See also

Random Number Generator Node Js

Random Key Generator Node Js Download

• Window.crypto to get a Crypto object.
• Math.random, a non-cryptographic source of random numbers.