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Node.js Buffer.readInt32LE() Method

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The Buffer.readInt32LE() method is used to read a 32 bit integer from a buffer object at a given offset and returns the result in Little endian. Syntax:
buffer.readInt32LE( offset )
Parameters: This method accepts a single parameter offset which specifies the position of buffer object. It represents number of bytes to skip before starting to read. The value of offset lies between 0 to buff.length – 4. The default value is 0. Return value: This method read an signed 32-bit integer at the specified offset in Little endian. Example 1:
// Node.js program to demonstrate the
// buffer.readInt32LE() method 
const buff = Buffer.from([1, 2, 3, 4, 5]);
  
console.log(buff.readInt32LE(0));
  
console.log(buff.readInt32LE(1));

                    
Output:
67305985
84148994
Example 2:
// Node.js program to demonstrate the
// bufferobj.readInt32LE() method 
const buff = Buffer.from([1, 2, 3, 4, 5]);
  
console.log(buff.readInt32LE(4))

                    
Output:
buffer.js:831
    throw new RangeError('Index out of range');
    ^

RangeError: Index out of range
    at checkOffset (buffer.js:831:11)
    at Buffer.readInt32LE (buffer.js:984:5)
    at Object. (/home/cg/root/8545664/main.js:8:18)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.runMain (module.js:604:10)
    at run (bootstrap_node.js:389:7)
The above example shows the error because its parameters are not in the valid range. Note:
  • To get the values in Little endian format you can use Buffer.readInt32BE() method.
  • The above program will compile and run by using the node index.js command.
Reference: https://nodejs.org/api/buffer.html#buffer_buf_readint32le_offset

Last Updated : 13 Oct, 2021
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