awkjs

The JavaScript compilation of GNU awk that can be run in browser and NodeJS.

This JavaScript library is a result of compiling GNU awk using emscripten. Here is a step-by-step guide on how to do it. Though the guide uses jq for the example, but the process is the same.

install it

npm install awkjs --save

use it in the code

import { awkjs } from 'awkjs';

awkjs().then(({ awk }) => {
    // echo 'Hello World' | awk '{$2="AWK"; print $0}'
    const output = awk('Hello World', '{$2="AWK"; print $0}', []);
    // stdout has the result (succeeds)
    const result = output.stdout;
    // stderr has the error (fails)
    const error = output.stderr;
});

or

var awkjs = require("awkjs").awkjs

awkjs().then(({ awk }) => {
    // echo 'Hello World' | awk '{$2="AWK"; print $0}'
    const output = awk('Hello World', '{$2="AWK"; print $0}', []);
    console.log(output);
});

just a note

The above awkjs() promise resolves to the Module object of emscripten API. However, for this library, the user should only cares and uses the awk method. Other members in the Module object should never be used.

more examples

// awk -V
awkjs().then(({ awk }) => {
    const output = awk('', '', ['-V'])
});

// echo 'AWK is an awesome!\nIt is usefully.\nAWK is cool.' | awk '/^AWK/'
awkjs().then(({ awk }) => {
    const output = awk('AWK is an awesome!\nIt is usefully.\nAWK is cool.', '/^AWK/', []);
});

// echo 'JAVA code\nphp code\nJava tests' | awk 'tolower($0) ~ /^java/;'
awkjs().then(({ awk }) => {
    const output = awk('JAVA code\nphp code\nJava tests', 'tolower($0) ~ /^java/;', []);
});

version

GNU Awk 5.1.0, API: 3.1