Supported File Types (Strings)

.JSON - Chrome Messages (Strings)

Content is machine translated from English by Phrase Language AI.

File Extensions


API Extension






Plural forms support


Description support


Format options


Google provides internationalization support for Chrome extensions. Localized strings for Chrome extensions are stored in a .JSON file often named messages.json. Chrome JSON files have a slightly different structure than .JSON files used for localization on other platforms. For Chrome JSON, strings that need translation are placed in the sub-key message nested under each unit key-value pair. A description may also be added to each key-value pair.

Code Sample

  "boolean_key": {
    "message": "--- true\n"
  "empty_string_translation": {
    "message": ""
  "key_with_description": {
    "message": "Check it! Key has a description! (In some formats)",
    "description": "I'm a very important description for this key!"
  "key_with_line-break": {
    "message": "This translations contains\na line-break."
  "nested.deeply.key": {
    "message": "  I'm nested deeply."
  "nested.key": {
    "message": "This key is nested inside a namespace."
  "null_translation": {
    "message": null
  "": {
    "message": "Only one pluralization found."
  "pluralized_key.other": {
    "message": "Wow, you have %s pluralizations!"
  "": {
    "message": "You have no pluralization."
  "sample_collection": {
    "message": "---\n- first item\n- second item\n- third item\n"
  "simple_key": {
    "message": "I am a simple key with a simple message."
  "unverified_key": {
    "message": "Not yet verified waiting for it. (In some formats we also export this status)"

Plurals for JSON files

The most common format of plural key messages on various libraries:

"messages": {
    "one": "One message received.",
    "other": "%s messages received.",
    "zero": "No messages received."
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