1.0.2462 • Public • Published


NETS is an experimental project that provides a common way to configure, run and integrate parsers, locally and in the cloud. It includes concepts from Extended Backus Naur Form (EBNF), ISO/IEC 14977, Parser Expression Grammars (PEGs), Abstract Syntax Trees (ASTs) represented as DOMs, pipelines and grammar libraries. It is an open source project for anyone to use and contribute to. For more information goto

Download and Installation

To download and install use npm.

npm -install nets-parser

The node_modules/nets-parser folder contains the executables and libraries required to run NETS on all supported platforms including:

  • macos-x86-64
  • linux-x86-64
  • wasm-wasi-32
  • wasm-node-32
  • wasm-web-32


Update the paths in nets-parser.js when using the wasm-node-32 build. If required add the node_modules/nets-parser folder to the PATH.

Executables and scripts are contained in the node_modules/nets-parser root folder. Tests are contained in the tests subfolder.


Native executables depend on system libraries. Use lld nets-parser to determine these on Linux or otool -L nets-parser on MacOS. Platform version dependencies are undocumented at present.

The wasm-wasi-32 build depends on a Web Assembly (WASM) and Web Aassembly System Interface (WASI) runtime such as Wasmtime. The wasm-node-32 build depends on Node > v12.x. The wasm-web-32 build depends on a WASM capable web browser.


Native Executable

Nets parser is started from the command line by invoking the nets-parser executable.

> nets-parser-macos-x86-64-v1.0d [arguments]

nets-parser-macos-x86-64-v1.0d is the executable file name on MacOS for the x86 64 bit architrecture, in debug mode.

NodeJS Executable

Nets parser requires Node to run the wasm-node executable. A helper JavaScript program nets-parser.js is used for node. (Update the paths in nets-parser.js when using the wasm-node-32 build).

node nets-parser.js -- [arguments]

Nets Command line arguments are added after the double dash --.

Wasmtime Executable

Nets parser requires Wasmtime to run the wasm-wasi executable. Nets requires wasmtime permission to directories for working files, temporary files and the wasm executable. Nets Command line arguments are added after the double dash --.

> wasmttime nets-parser-wasi.wasm --dir=. --dir=/tmp --dir=${path to nets-parser-debug.wasm} -- [arguments]

Running Tests



This is NETS v1.0 published 26th January 2021.

  • Initial support for macos-x86-64, wasm-wasi-32, wasm-node-32 and wasm-web-32 architectures
  • Initial feature set including ISO 14977, EBNF, PEG, Grammar XML, pipelines, input/output semantics, abstract syntax trees, logging, breakpoints, single byte characters, wide characters, echo, production terminals, predicates
  • Internal libraries ctype, utility, compress, encrypt, command
  • External libraries encrypt and iconv


No previous versions


Contributions to NETS are welcome. Please contact us if you would like access to the source code repository hosted on Bitbucket.


If you would like to contact the project owner please


NETS is published under an open source license. If you would like more details please contact me.

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  • timnelms