react-native-nitro-buffer

A high-performance, Node.js compatible Buffer implementation for React Native, powered by Nitro Modules and C++.

🚀 Features

• ⚡️ Blazing Fast: Implemented in C++ using Nitro Modules for maximum performance.
• ✅ Node.js Compatible: Drop-in replacement for the standard Node.js Buffer API.
• 🔒 Type Safe: Written in TypeScript with full type definitions.
• 📦 Zero Dependencies: Lightweight and efficient.
• 📱 Cross Platform: Works flawlessly on iOS and Android.

🏎️ Performance

react-native-nitro-buffer is significantly faster than other Buffer implementations for React Native.

Device: iPad Air 5 (M1) - Physical Device

Operation	Nitro Buffer	Competitor (Craftz)	Improvement
fill(0)	0.019ms	10.37ms	~545x 🚀
write(utf8)	2.47ms	212.04ms	~85x 🚀
toString(utf8)	0.89ms	169.16ms	~190x 🚀
toString(base64)	0.69ms	3.40ms	~4.9x 🚀
from(base64)	1.40ms	146.56ms	~104x 🚀
toString(hex)	4.85ms	57.34ms	~11.8x 🚀
from(hex)	11.06ms	138.04ms	~12.5x 🚀
btoa(1MB)	3.00ms	45.90ms	~15.3x 🚀
atob(1MB)	5.12ms	149.73ms	~29.2x 🚀
alloc(1MB)	0.33ms	0.09ms	0.27x

Device: iPhone 16 Pro Simulator (Mac mini M4)

Operation	Nitro Buffer	Competitor (Craftz)	Improvement
fill(0)	0.015ms	13.78ms	~918x 🚀
write(utf8)	4.27ms	163.46ms	~38x 🚀
toString(utf8)	0.93ms	141.56ms	~152x 🚀
toString(base64)	1.71ms	4.71ms	~3x 🚀
from(base64)	16.45ms	104.67ms	~6x 🚀
toString(hex)	4.89ms	43.46ms	~9x 🚀
from(hex)	17.93ms	95.00ms	~5x 🚀
btoa(1MB)	1.13ms	34.87ms	~31x 🚀
atob(1MB)	2.18ms	91.41ms	~42x 🚀
alloc(1MB)	0.18ms	0.03ms	0.16x

> Benchmarks averaged over 50 iterations on 1MB Buffer operations.

Note

About alloc Performance: The slight difference in allocation time (~0.3ms) is due to the overhead of initializing the ES6 Class structure (Object.setPrototypeOf), which provides a cleaner and safer type inheritance model compared to the functional mixin approach. This one-time initialization cost is negligible compared to the massive 5x - 550x performance gains in actual Buffer operations.

Tip

atob/btoa Optimization: In modern React Native environments (Hermes), global.atob and global.btoa are natively implemented and highly optimized. react-native-nitro-buffer automatically detects and uses these native implementations if available, ensuring your app runs at peak performance while maintaining Node.js utility compatibility.

📦 Installation

npm install react-native-nitro-buffer
# or
yarn add react-native-nitro-buffer

iOS Setup

cd ios && pod install

📖 Usage

Import Buffer directly from the package. It follows the standard Node.js Buffer API.

import{Buffer}from'react-native-nitro-buffer';// 1. Allocationconstbuf=Buffer.alloc(10);buf.fill(0);// 2. From Stringconsthello=Buffer.from('Hello World');console.log(hello.toString('hex'));// 48656c6c6f20576f726c64// 3. String Encoding/Decodingconstbase64=hello.toString('base64');console.log(base64);// SGVsbG8gV29ybGQ=constdecoded=Buffer.from(base64,'base64');console.log(decoded.toString());// Hello World// 4. Binary Manipulationconstbuf2=Buffer.allocUnsafe(4);buf2.writeUInt8(0x12,0);// (Note: typed array methods available via standard Uint8Array API)

🧩 API Support

This library achieves 100% API compatibility with Node.js Buffer.

Static Methods

• Buffer.alloc(size, fill, encoding)
• Buffer.allocUnsafe(size)
• Buffer.from(array|string|buffer)
• Buffer.byteLength(string, encoding)
• Buffer.isBuffer(obj)
• Buffer.compare(buf1, buf2)
• Buffer.concat(list, totalLength)
• Buffer.isEncoding(encoding)
• Buffer.poolSize

Instance Methods

• Binary Read/Write:
  • readInt8, readUInt8, writeInt8, writeUInt8
  • readInt16LE/BE, readUInt16LE/BE, writeInt16LE/BE, writeUInt16LE/BE
  • readInt32LE/BE, readUInt32LE/BE, writeInt32LE/BE, writeUInt32LE/BE
  • readBigInt64LE/BE, readBigUInt64LE/BE, writeBigInt64LE/BE, writeBigUInt64LE/BE
  • readFloatLE/BE, readDoubleLE/BE, writeFloatLE/BE, writeDoubleLE/BE
  • readIntLE/BE, readUIntLE/BE, writeIntLE/BE, writeUIntLE/BE
• String/Search:
  • includes(value, byteOffset, encoding)
  • indexOf(value, byteOffset, encoding)
  • lastIndexOf(value, byteOffset, encoding)
  • fill(value, offset, end, encoding)
• Manipulation/Utils:
  • write(string, offset, length, encoding)
  • toString(encoding, start, end)
  • compare(target, ...)
  • copy(target, ...)
  • slice(start, end) (Returns a view, similar to Node.js subarray)
  • swap16(), swap32(), swap64()
  • toJSON()

🔄 Interoperability

react-native-nitro-buffer is designed to be fully interoperable with React Native's ecosystem.

• Standard Uint8Array: Instances are standard Uint8Arrays, so they work with any API accepting standard typed arrays.
• @craftzdog/react-native-buffer: Fully compatible. You can convert between the two or mix them in standard operations (like concat or compare) because both adhere to standard byte structures.

  import{BufferasNitroBuffer}from'react-native-nitro-buffer';import{BufferasCraftzBuffer}from'@craftzdog/react-native-buffer';constnBuf=NitroBuffer.from('Hello');constcBuf=CraftzBuffer.from(nBuf);// Works!

⚠️ Compatibility Notes

toString('ascii') Behavior

When decoding binary data with non-ASCII bytes (0x80-0xFF), react-native-nitro-buffer follows the Node.js standard by replacing invalid bytes with the Unicode replacement character (U+FFFD, displayed as �).

constbuf=Buffer.from([0x48,0x69,0x80,0xFF,0x21]);// "Hi" + invalid bytes + "!"buf.toString('ascii');// Nitro (Node.js compatible): "Hi��!" (length: 5)// @craftzdog/react-native-buffer: "Hi!" (length: 5) - incorrectly drops invalid bytes

This ensures consistent behavior with Node.js when handling binary protocols like WebSocket messages containing mixed text and binary data (e.g., Microsoft TTS audio streams).

📄 License

ISC