Node.js Buffer.readBigUInt64LE() Method Last Updated : 27 Jan, 2023 Comments Improve Suggest changes Like Article Like Report 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 javascript // Node.js program to demonstrate the // buffer.readBigUInt64LE() method const buff = Buffer.from([0x00, 0x00, 0x0e, 0x00, 0xff, 0xff, 0xff, 0xff]); // Getting big integer value by // using readBigUInt64LE method const value = buff.readBigUInt64LE(0); // Display the result console.log("Big Integer :- " + value); Run the index.js file using the following command: node index.js Output: Big Integer :- 18446744069415501824 Example 2: Filename: index.js javascript // Node.js program to demonstrate the // buffer.readBigUInt64LE() method const buff = Buffer.from([0x00, 0x00, 0x0e, 0x00, 0xff, 0xff, 0xff, 0xff]); // Getting big integer value by // using readBigUInt64LE method const value = buff.readBigUInt64LE(1); // Display the result console.log("Big Integer :- " + value); 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 Comment More infoAdvertise with us Next Article Node.js Buffer.readBigUInt64LE() Method rohitprasad3 Follow Improve Article Tags : Web Technologies Node.js Node.js-Buffer-module Similar Reads Node.js Buffer.copy() Method Buffer is a temporary memory storage that stores the data when it is being moved from one place to another. It is like an array of integers. The Buffer.copy() method simply copies all the values from the input buffer to another buffer. Syntax:buffer.copy( target, targetStart, sourceStart, sourceEnd 2 min read Node.js Buffer.includes() Method Buffer is a temporary memory storage which stores the data when it is being moved from one place to another. It is like an array of integers. The Buffer.includes() method checks whether the provided value is present or included in the buffer or not. 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