Node.js Buffer.readBigUInt64LE() Method

The Buffer.readBigUInt64LE() method is used to read unsigned 64 bit integer from a buffer object at a given offset and returns the result in Little endian.
Syntax: 

buffer.readBigUInt64LE( offset )

Parameters: This method accepts a single parameter offset which specifies the position of buffer object. It represents the number of bytes to skip before starting to read. The value of offset lies within the range 0 to buffer.length - 8. The default value is 0.

Return value: This method reads an unsigned 64-bit integer at the specified offset in Little endian.

Example 1: 
Filename: index.js 

Run the index.js file using the following command: 

node index.js

Output: 

Big Integer :- 18446744069415501824

Example 2: 
Filename: index.js 

Run the index.js file using the following command: 

node index.js

Output:  

internal/buffer.js:77
 throw new ERR_OUT_OF_RANGE(type || 'offset',
 ^

RangeError [ERR_OUT_OF_RANGE]: The value of "offset" is out of range. It must be >= 0 and
 <= 0. Received 1
 at boundsError (internal/buffer.js:77:9)
 at Buffer.readBigUInt64LE (internal/buffer.js:88:5)
 at Object. (F:\java\GFG.js:7:20)
 at Module._compile (internal/modules/cjs/loader.js:1138:30)
 at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10)
 at Module.load (internal/modules/cjs/loader.js:986:32)
 at Function.Module._load (internal/modules/cjs/loader.js:879:14)
 at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
 at internal/main/run_main_module.js:17:47 {
 code: 'ERR_OUT_OF_RANGE'
}

The above example shows the error because its parameters are not in the valid range.

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/buffer.html#buffer_buf_readbiguint64le_offset