Yet another tool, written in JS for Searching Text in Files!

Node text search in files

npm install find-in

How it works?

It creates read stream to read from the target file in chunks, matches the chunks using match method and returns an array of objects contains the final results.



options object contains:

  • path: string file path,
  • request: array array of regex that will be matched in file
  • encoding:? string read stream encoding (default: utf8)
  • join: string number of chunk combined (default: 2), increasing the number will widen the matching chunk boundaries

The results is promise contains report: array An array of objects. Each element contains three keys:

  • isFound: Boolean search result
  • reg: string regex sent in request
  • match: array matching result. An array if there are results otherwise returns null. for more see String.prototype.match()


const find = require("find-in");

// let's create some request to search for it in our file.
const req = [/old/g, /new/g];

const report = await find({ path: "/path/to/fileName", request: req });

// > report:
// [
//   {
//     isFound: true,
//     reg: /old/g,
//     match: ["old"], // the result of matching
//   },
//   {
//     isFound: false, // not found so it wasn't changed
//     reg: /new/g,
//     match: null,
//   },
// ];

Or you can check a specific result as following.

const report = await find({
  path: "/path/to/fileName",
  request: [phrase0, phrase1, phrase2, phrase3],

if (report[2].isFound) {
  console.log("found phrase2!");
  // do something
} else {
  console.log("phrase2 is not found!");
  // do something else


Related projects


This project is licensed under the MIT License

Author: Shantun Parmar

1 thought on “Yet another tool, written in JS for Searching Text in Files!

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