replace-in-files Build Status

Utility to replace a map of strings in many files

Use cases:

  • pipe from hashmark to replace references to hashmarked files - see example
  • replace dev environment paths to production
  • inject values in a config file

Not actively worked on

We're happy to accept PRs and suggestions, but be aware that this project is no longer used internally and therefore not actively maintained + improved by Songkick.



npm i replaceinfiles

Create or generate a replace map, save in a file or pipe to stdin

  "foo": "bar",
  "hello": "goodbye",
  "world": "earth",
  "%API_URL%": ""


Usage: replaceinfiles [options]


    -h, --help                     output usage information
    -V, --version                  output the version number
    -s, --source <glob>            glob matching files to be updated
    -d, --dest-pattern <path>      pattern to output files
    -o, --output-path <path>       path to output report file default: stdout
    -S, --silent                   do not output report
    -r, --replace-map-path <path>  path to replace map json, default: stdin
    -e, --encoding <string>        used for both read and write, default "utf-8"


  • Streaming replace map from stdin
  cat replace-map.json | replaceinfiles -s src/*.css -d 'dist/{base}'
  • Getting replace map from file
  replaceinfiles -r replace-map.json -s src/*.css -d 'dist/{base}'
  • Write report to a file
  replaceinfiles -r replace-map.json -s src/*.css -d 'dist/{base}' > report.json
  # or
  replaceinfiles -r replace-map.json -s src/*.css -d 'dist/{base}' -o report.json


replaceinfiles generates a report on stdout or specified path for you to pipe other tools if you need to.

Here is an example:

  "options": {
    "source": "test/src/*.txt",
    "destPattern": "test/dist/{base}",
    "outputPath": null,
    "replaceMapPath": null,
    "replaceMap": {
      "hello": "goodbye",
      "world": "earth"
    "encoding": "utf-8"
  "result": [
      "src": "test/src/one.txt",
      "dest": "test/dist/one.txt",
      "changed": true
      "src": "test/src/three.txt",
      "dest": "test/dist/three.txt",
      "changed": false
      "src": "test/src/two.txt",
      "dest": "test/dist/two.txt",
      "changed": true

Options details

-s, --source: A glob matching the files you want to replace from

-d, --dest-pattern: A pattern to define updated files destination. You can use all the path.parse() result values (root, dir, name, base, ext), example: -d './dist/{dir}/{name}.build{ext}'

-r, --replace-map-path: Path to a replace map JSON file ({'stringToReplace': 'replaceWithThat', '..', '...'}). stdin is used as default.

-o, --output-path: A path to write the report, default is stdout

-S, --silent: Do not output report, bypasses -o

-e, --encoding: Used for both read and write, default: utf-8


You can also run replaceinfiles from node.

var replaceinfiles = require('replaceinfiles');

var options = {
  source: './test/*.txt',
  destPattern: './test/dist/{base}',
  replaceMap: {
    foo: 'bar'
  // or, specify a path to your replaceMap json file
  // replaceMapPath: './map.json'

    // ...
  .catch(function(error) {
    // ...

If you do not specify replaceMap or replaceMapPath then stdin will be used.