ReplaceTokens

Replace tokens in text files with values from the command-line, files or environment variables.

What's new

Please refer to the release page for the latest release notes.

CLI

Install replace tokens as a global CLI:

npm install -g replacetokens

Usage

replacetokens --sources
              [--add-bom]
              [--case-insensitive-paths]
              [--chars-to-escape]
              [--encoding]
              [--escape {auto, off, json, xml, custom}]
              [--escape-char]
              [--help]
              [--include-dot-paths]
              [--log-level {debug, info, warn, error, off}]
              [--missing-var-action {none, keep, replace}]
              [--missing-var-default]
              [--missing-var-log {off, warn, error}]
              [--no-log-color]
              [--recursive]
              [--root]
              [--separator]
              [--token-pattern {default, azurepipelines, doublebraces, doubleunderscores, githubactions, octopus, custom}]
              [--token-prefix]
              [--token-suffix]
              [--transform]
              [--transform-prefix]
              [--transform-suffix]
              [--use-env]
              [--variables]
              [--version]

Required parameters

--sources <list>

A list of files to replace tokens in.

Each entry supports:

• multiple glob patterns separated by a semi-colon (;) using fast-glob syntax (you must always use forward slash (/) as a directory separator)
• outputing the result in another file adding the output path after an arrow (=>)
• wildcard replacement in the output file name using an asterix (*) in the input and output file names

If the output path is a relative path, it will be relative to the input file.

Example: **/*.json; !local/ => out/*.json will match all files ending with .json in all directories and sub directories except in local directory and the output will be in a sub directory out relative to the input file keeping the file name.

Optional parameters

--add-bom

Add BOM when writing files.

--case-insensitive-paths

Enable case-insensitive file path matching in glob patterns (sources and variables).

--chars-to-escape <string>

The characters to escape when using custom escape.

--encoding <string>

The encoding to read and write all files. Default is auto.

Accepted values:

• auto: use jschardet to determine encoding
• any value supported by iconv-lite

--escape <string>

Character escape type to apply on each value. Default is auto.

Accepted values:

• auto: automatically apply JSON or XML escape based on file extension
• off: don't escape values
• json: JSON escape
• xml: XML escape
• custom: apply custom escape using escape-char and chars-to-escape

--escape-char <string>

The escape character to use when using custom escape.

--help

Show help.

--include-dot-paths

Include directories and files starting with a dot (.) in glob matching results (sources and variables).

--log-level <string>

The log level. Default is info.

Accepted values: debug, info, warn, error, off

--missing-var-action <string>

The action to take when a key is not found. Default is none.

Accepted values:

• none: replace with empty string and log key not found
• keep: leave token and log key not found
• replace: replace with missing-var-default

--missing-var-default <string>

The default value to use when a key is not found. Default is empty string;

--missing-var-log <string>

The level to log the key not found message. Default is warn.

Accepted values: warn, error, off

--no-log-color

Disable color in logs.

--recursive

Enable token replacements in values recusively.

Example: #{message}# with variables { "message": "hello #{name}#!", "name": "world" } will result in hello world!

--root <string>

The root path to use when reading files with relative paths in sources or variables. Default is the current working directory.

--separator <string>

The separtor to use when flattening keys in variables. Default is ..

Example

{
  "key1": {
    "key2": ["value1", "value2"],
    "key3": "value3"
  }
}

Will be flatten to

{
  "key1.key2.0": "value1",
  "key1.key2.1": "value2",
  "key1.key3": "value3",
}

--token-pattern <string>

The token pattern to use. Default is default.

Accepted values:

• azurepipelines: $( ... )
• custom: token-prefix ... token-suffix
• default: #{ ... }#
• doublebraces: {{ ... }}
• githubactions: ${{ ... }}
• octopus: #{ ... }

--token-prefix <string>

The token prefix when using custom token pattern.

--token-suffix <string>

The token suffix when using custom token pattern.

--transforms

Enable transforms on values. The syntax to apply transform on a value is #{<transform>(<name>[,<parameters>])}#

Supported transforms:

• base64(name): base64 encode the value
• indent(name[, size, firstline]): indent lines in the value where size is the indent size (default is 2) and firstline specifies if the first line must be indented also (default is false)
• lower(name): lowercase the value
• raw(name): raw value (disable escaping)
• upper(name): uppercase the value

Example:

key1: #{base64(key1)}#
key2:
#{indent(multiline, 2)}#
key3:
#{indent(multiline, 2, true)}#
key4: #{lower(key2)}#
key5: #{raw(key1)}#
key6: #{upper(key1)}#

With variables:

{
  "key1": "value1",
  "key2": "VALUE2",
  "multiline": "- v1\n- v2"
}

Will result in:

key1: dmFsdWUx
key2:
- v1
  - v2
key3:
  - v1
  - v2
key4: value2
key5: value1
key6: VALUE1

--transforms-prefix <string>

The tranforms prefix when using transforms. Default is (.

--transforms-suffix <string>

The tranforms suffix when using transforms. Default is ).

--use-env

Include environment variables as variables (names are case-insensitive). Parameter is required if --variables is not specified.

--variables <list>

A list of strings or JSON encoded key/values (keys are case-insensitive). Parameter is required if --use-env is not specified.

If an entry starts with:

• @: value is parsed as a multiple glob patterns separated by a semi-colon (';') using fast-glob syntax to JSON or YAML files
• $: value is parsed as an environment variable name containing JSON encoded key/value pairs

Multiple entries are merged into a single list of key/value pairs.

Example: '@**/*.(json|yaml);!vars.local.json' '$VARS' '{ "var1": "inline", "var2": "inline" }' will:

• read and parse all files with .json or .yaml extension except vars.local.json
• read and parse the environment variable VARS
• parse the inline key/values { "var": "inline", "var2": "inline" } }

--version

Show version number.

Exit codes

The replacetokens CLI returns an exit code to indicate whether it succeeded or not.

Exit code	Description
0	Completed successfully.
1	At least on error appended.

API

Install replace tokens as a module:

npm install replacetokens

Usage

loadVariables(string[] [, options])

import * as rt from 'replacetokens';

const variables = await rt.loadVariables(
  [
    '{ "var1": "value1" }', // inline key/values
    '@**/vars.(json|yml)',  // read all vars.json and vars.yml files under root
    '$VARS'                 // parse env VARS as JSON
  ],
  {
    root: '.local'
  });

Load variables from the given list of strings; keys are flatten, merged are returned in uppercase.

See CLI documentation for the parsing pattern and constraints.

options:

• caseInsensitive (default: false): enable case-insensitive matching in file paths
• dot (default: false): include directories and files starting with a dot (.) in glob matching results
• normalizeWin32 (default: false): replace back-slashes (\) with forward-slashes (/) in file paths
• root: (default: current working directory): root path used when reading files with relative paths
• separator (default: .): the separator used when flattening the keys

replaceTokens(string[], (string) => string | undefined [, options])

import * as rt from 'replacetokens';

const vars = { VAR1: "hello #{upper(var2)}#", VAR2: "world!" }; // keys must be uppercase

const result = await rt.replaceTokens(
  ['settings.json'],
  (name: string) => vars[name],
  {
    recursive: true,
    transforms: { enable: true }
  });

Replaces the tokens in the sources files using the callback getVariable to retrieve the values (name will always be in uppercase).

See CLI documentation for the input files pattern.

options:

• addBOM (default: false): add BOM when writing files
• encoding (default: auto): encoding to read and write all files
• escape: specifies how to escape values
  • chars (default: null): the characters to escape if type is custom
  • escapeChar (default: null): the escape character to use if type is custom
  • type (default: none): the type of escape between: none, auto, json, xml and custom
• missing: specifies how to manage a key not found
  • action (default: none): the action when a key is not found
  • default (default: null): the default value
  • log (default: warn): the key not found message log level
• recursive (default: false): specifies if recursive replacement is enabled
• root (default: current working directory): root path used when reading files with relative paths
• sources: specifies glob pattern options
  • caseInsensitive (default: false): enable case-insensitive matching in file paths
  • dot (default: false): include directories and files starting with a dot (.) in glob matching results
• token: specifies the token pattern
  • pattern (default: default): the token pattern
  • prefix (default: null): the token prefix if pattern is custom
  • suffix (default: null): the token suffix if pattern is custom
• transforms: configures the transforms feature
  • enabled (default: false): specifies if transforms are enabled
  • prefix (default: (): the transform prefix
  • suffix (default: )): the transform suffix