Response Format

Success responses are encoded into a generalized JSON structure with two basic properties: a response code, and a custom data object.

    "response": {
        "code": "SUCCESS",
        "data": {
            "localeId": "de-DE",
            "lastModified": "[YYYY-MM-DDThh:mm:ssZ]"

Error responses include an array of errors, each with a key and message explaining the details of the error. Some errors may give additional details.

  "response": {
    "code": "VALIDATION_ERROR",
    "errors": [{
      "key": "parse.error",
      "message": "There was a problem loading your file. No source strings found; Check your configuration",
      "details": {
        "errorId": "cse8rqnf"

Response Codes

Value Description HTTP Code
SUCCESS If the service request was processed normally 200
ACCEPTED For file uploads, if the upload has begun but is taking more than a minute to complete, a 202 response is sent. 202
VALIDATION_ERROR If something specific was wrong with the request parameters provided. One or more will describe the particular invalid parameter. 400
AUTHENTICATION_ERROR If the provided credentials were not valid. 401
AUTHORIZATION_ERROR Legacy error code from API 401
RESOURCE_LOCKED The requested file is currently being processed by another operation. The file will be unlocked after the operation completes. See Upload for more details. 423
MAX_OPERATIONS_LIMIT_EXCEEDED Too many simultaneous API requests per project or file. 429
GENERAL_ERROR If an unexpected error occurred during the service request processing. 500
MAINTENANCE_MODE_ERROR If Smartling has entered maintenance mode, all API services will return this error. After exiting maintenance mode all services should return to normal. 503