{"id":12876,"library":"barse","title":"Barse Binary Parser","description":"Barse is a JavaScript library designed for creating streaming binary parsers with a fluent API. It enables developers to process binary data in chunks, extracting named fields based on specified lengths and applying transformation functions. The current stable version, 0.4.3, was last published over a decade ago in 2013, indicating it is an unmaintained project. This library's key differentiator was its simple, chainable interface for low-level binary data manipulation. However, due to its age, it relies on older Node.js `Buffer` APIs and exclusively uses CommonJS modules, lacking modern features such as native ESM support or TypeScript definitions. This makes it largely unsuitable for new projects or environments that require adherence to recent JavaScript standards or active software maintenance.","status":"abandoned","version":"0.4.3","language":"javascript","source_language":"en","source_url":"git://github.com/juliangruber/barse","tags":["javascript","binary","parser","parse","fluent"],"install":[{"cmd":"npm install barse","lang":"bash","label":"npm"},{"cmd":"yarn add barse","lang":"bash","label":"yarn"},{"cmd":"pnpm add barse","lang":"bash","label":"pnpm"}],"dependencies":[],"imports":[{"note":"This library is CommonJS-only, as it was last updated in 2013.","symbol":"parse","correct":"const parse = require('barse');"},{"note":"While CommonJS, it exports a default function. Modern bundlers might transpile `import parse from 'barse'` to work, but direct named imports `import { parse } from 'barse'` will fail as there are no named exports. ESM support is not native.","wrong":"import { parse } from 'barse';","symbol":"parse","correct":"import parse from 'barse';"}],"quickstart":{"code":"const parse = require('barse');\n\nconst parser = parse()\n  .next('foo', 3, function (chunk, offset) {\n    return chunk.toString('utf8', offset, offset + 3);\n  })\n  .next('bar', 3, function (chunk, offset) {\n    return chunk.toString('utf8', offset, offset + 3);\n  });\n\nparser.on('data', (data) => {\n  console.log('Parsed data:', data);\n});\nparser.on('error', (err) => {\n  console.error('Parser error:', err);\n});\n\n// Use Buffer.from for modern Node.js compatibility\nparser.write(Buffer.from('fo'));\nparser.write(Buffer.from('ob'));\nparser.write(Buffer.from('ar'));\nparser.end();","lang":"javascript","description":"This quickstart demonstrates how to create a simple binary parser using Barse to extract two 3-byte UTF-8 strings, 'foo' and 'bar', from a fragmented binary input. It showcases the fluent API for defining parsing steps and handling data events."},"warnings":[{"fix":"Replace all instances of `new Buffer(...)` with `Buffer.from(...)` for creating buffers from data, or `Buffer.alloc(...)` for creating initialized buffers.","message":"The library heavily relies on the legacy `new Buffer()` constructor, which has been deprecated since Node.js 6.0.0 and removed in Node.js 10.0.0. Modern Node.js environments require `Buffer.from()`, `Buffer.alloc()`, or `Buffer.allocUnsafe()`.","severity":"breaking","affected_versions":"<=0.4.3"},{"fix":"Use `const parse = require('barse');` for Node.js projects. For browser or ESM projects, a bundler (like Webpack or Rollup) configured for CJS interoperability is necessary, or consider using a modern alternative.","message":"Barse is a CommonJS-only module, published in 2013. It does not natively support ECMAScript Modules (ESM) `import` syntax. Attempting to import it directly in an ESM context may lead to errors or require bundler/transpilation workarounds.","severity":"breaking","affected_versions":"<=0.4.3"},{"fix":"Evaluate modern, actively maintained binary parsing libraries that offer similar functionality and are compatible with current JavaScript standards and Node.js environments.","message":"This library is unmaintained, with its last publish over 10 years ago. It may contain unpatched security vulnerabilities, critical bugs, or be incompatible with newer Node.js versions or JavaScript features. Using it in production environments is highly discouraged.","severity":"gotcha","affected_versions":"<=0.4.3"},{"fix":"Create a `barse.d.ts` file with `declare module 'barse' { ... }` to provide basic type information for the `parse` function and its methods, or migrate to a library with built-in TypeScript support.","message":"The library does not provide TypeScript type definitions. Projects using TypeScript will need to create custom declaration files (`.d.ts`) or use `// @ts-ignore` for imports and usage.","severity":"gotcha","affected_versions":"<=0.4.3"}],"env_vars":null,"last_verified":"2026-04-19T00:00:00.000Z","next_check":"2026-07-18T00:00:00.000Z","problems":[{"fix":"Replace `new Buffer(data)` with `Buffer.from(data)` or `Buffer.alloc(size)` as appropriate for your use case.","cause":"Attempting to use the deprecated `new Buffer()` constructor in Node.js versions 10.x or higher.","error":"TypeError: Buffer is not a constructor"},{"fix":"Use a default import pattern: `import parse from 'barse';` which might be transpiled by a bundler. For pure CommonJS, use `const parse = require('barse');`.","cause":"Attempting to use `import { parse } from 'barse';` in an ESM context. The library is CommonJS-only and exports a default function, not named exports.","error":"SyntaxError: Named export 'parse' not found (module 'barse')"},{"fix":"Ensure `parse` is correctly imported as a default export (`const parse = require('barse');` or potentially `import parse from 'barse';` with a bundler) before calling `parse().next(...)`.","cause":"This typically occurs if `parse()` does not return an object with a `next` method, often due to incorrect import (e.g., trying `import { parse } from 'barse'` when `parse` is a default export, leading to `undefined` being assigned to `parse`).","error":"TypeError: Cannot read properties of undefined (reading 'next')"}],"ecosystem":"npm","meta_description":null,"install_score":null,"install_tag":null,"quickstart_score":null,"quickstart_tag":null,"pypi_latest":null,"cli_name":null}