Remote Config Templates and Versioning

Firebase console

In the Parameters tab, select the "clock" icon displayed at top right. This opens the Change history page listing all stored template versions in a list menu at the right.

Details displayed for each stored version include information on whether the changes originated with the Console, with the REST API, from a rollback, or whether they were incremental changes from a forced save of the template.

Firebase CLI

firebase remoteconfig:versions:list

Use the --limit option to limit the number of versions being returned. Pass '0' to fetch all versions.

Node.js

function listAllVersions() {
  admin.remoteConfig().listVersions()
    .then((listVersionsResult) => {
      console.log("Successfully fetched the list of versions");
      listVersionsResult.versions.forEach((version) => {
        console.log('version', JSON.stringify(version));
      });
    })
    .catch((error) => {
      console.log(error);
    });
}

Java

ListVersionsPage page = FirebaseRemoteConfig.getInstance().listVersionsAsync().get();
while (page != null) {
  for (Version version : page.getValues()) {
    System.out.println("Version: " + version.getVersionNumber());
  }
  page = page.getNextPage();
}

// Iterate through all versions. This will still retrieve versions in batches.
page = FirebaseRemoteConfig.getInstance().listVersionsAsync().get();
for (Version version : page.iterateAll()) {
  System.out.println("Version: " + version.getVersionNumber());
}

REST

curl --compressed -D headers -H "Authorization: Bearer <var>token</var>" -X GET https://firebaseremoteconfig.googleapis.com/v1/projects/<var>my-project-id</var>/remoteConfig:listVersions

Firebase console

By default, the details pane in the Change history tab displays the current active template. To view details for another version in the list, select it from the right menu.

You can view a detailed diff of the currently selected version and any other stored version by hovering over the context menu for any non-selected version and selecting Compare with selected version.

Firebase CLI

firebase remoteconfig:get -v VERSION_NUMBER

Optionally, you can write the output to a specified file with -o, FILENAME.

Node.js

Pass getTemplate() without any arguments to retrieve the latest version of the template, or to retrieve a specific version, use getTemplateAtVersion().

// Get template version: 6
admin.remoteConfig().getTemplateAtVersion('6')
  .then((template) => {
    console.log("Successfully fetched the template with ETag: " + template.etag);
  })
  .catch((error) => {
    console.log(error);
  });

Java

Template template = FirebaseRemoteConfig.getInstance().getTemplateAtVersionAsync(versionNumber).get();
// See the ETag of the fetched template.
System.out.println("Successfully fetched the template with ETag: " + template.getETag());

REST

curl --compressed -D headers -H "Authorization: Bearer <var>token</var>" -X GET https://firebaseremoteconfig.googleapis.com/v1/projects/<var>my-project-id</var>/remoteConfig?version_number=6

The URL parameter ?version_number is valid only for GET operations; you cannot use it to specify version numbers for updates. A similar get request without the ?version_number parameter would retrieve the current active template.

Firebase console

For previous template versions eligible for rollback, an option button to roll back to that version is displayed at top right of the Change history page. Click and confirm this only if you are sure you want to roll back to that version and use those values immediately for all apps and users.

Firebase CLI

firebase remoteconfig:rollback -v VERSION_NUMBER

Node.js

// Roll back to template version: 6
admin.remoteConfig().rollback('6')
  .then((template) => {
    console.log("Successfully rolled back to template version 6.");
    console.log("New ETag: " + template.etag);
  })
  .catch((error) => {
    console.log('Error trying to rollback:', e);
  })

Java

try {
  Template template = FirebaseRemoteConfig.getInstance().rollbackAsync(versionNumber).get();
  System.out.println("Successfully rolled back to template version: " + versionNumber);
  System.out.println("New ETag: " + template.getETag());
} catch (ExecutionException e) {
  if (e.getCause() instanceof FirebaseRemoteConfigException) {
    FirebaseRemoteConfigException rcError = (FirebaseRemoteConfigException) e.getCause();
    System.out.println("Error trying to rollback template.");
    System.out.println(rcError.getMessage());
  }
}

REST

To roll back to a stored Remote Config template, issue an HTTP POST with the custom method :rollback and, in the request body, the specific version to apply. For example:

curl --compressed -D headers -H "Authorization: Bearer <var>token</var>" -H "Content-Type: application/json" -X POST https://firebaseremoteconfig.googleapis.com/v1/projects/<var>my-project-id</var>/remoteConfig:rollback -d '{"version_number": 6}'

The response contains the contents of the now-active stored template, with its new version metadata.

Firebase console

1. From the Remote Config Parameters or Conditions tab, open the more_vertMenu, and select Download current config file.
2. When prompted, click Download config file, choose the location where you want to save the file, then click Save.

Firebase CLI

firebase remoteconfig:get -o filename

Node.js

function getTemplate() {
  var config = admin.remoteConfig();
  config.getTemplate()
      .then(function (template) {
        console.log('ETag from server: ' + template.etag);
        var templateStr = JSON.stringify(template);
        fs.writeFileSync('config.json', templateStr);
      })
      .catch(function (err) {
        console.error('Unable to get template');
        console.error(err);
      });
}

Java

Template template = FirebaseRemoteConfig.getInstance().getTemplateAsync().get();
// See the ETag of the fetched template.
System.out.println("ETag from server: " + template.getETag());

REST

curl --compressed -D headers -H "Authorization: Bearer token" -X GET https://firebaseremoteconfig.googleapis.com/v1/projects/my-project-id/remoteConfig -o filename

This command outputs the JSON payload to one file, and the headers (including the ETag) to a separate headers file.

Node.js

function validateTemplate(template) {
  admin.remoteConfig().validateTemplate(template)
      .then(function (validatedTemplate) {
        // The template is valid and safe to use.
        console.log('Template was valid and safe to use');
      })
      .catch(function (err) {
        console.error('Template is invalid and cannot be published');
        console.error(err);
      });
}

Java

try {
  Template validatedTemplate = FirebaseRemoteConfig.getInstance()
          .validateTemplateAsync(template).get();
  System.out.println("Template was valid and safe to use");
} catch (ExecutionException e) {
  if (e.getCause() instanceof FirebaseRemoteConfigException) {
    FirebaseRemoteConfigException rcError = (FirebaseRemoteConfigException) e.getCause();
    System.out.println("Template is invalid and cannot be published");
    System.out.println(rcError.getMessage());
  }
}

REST

Validate template updates by appending URL parameter ?validate_only=true to your publish request:

curl --compressed -H "Content-Type: application/json; UTF8" -H "If-Match: last-returned-etag" -H "Authorization: Bearer token" -X PUT https://firebaseremoteconfig.googleapis.com/v1/projects/my-project-id/remoteConfig?validate_only=true -d @filename

If your template was successfully validated, the curl command returns the JSON template you submitted and, in the saved headers file, you'll find an HTTP/2 status 200 and an updated ETag with the suffix -0. If your template was not validated, you'll receive the validation error in the JSON response and your headers file will contain a non-200 response (and no ETag).

Firebase console

1. From the Remote Config Parameters or Conditions tab, open the more_vertMenu, and select Publish from a file.
2. When prompted, click Browse, navigate to and select the Remote Config file you want to publish, then click Select.
3. The file will be validated and, if successful, you can click Publish to make the configuration immediately available to your apps and users.

Node.js

function publishTemplate() {
  var config = admin.remoteConfig();
  var template = config.createTemplateFromJSON(
      fs.readFileSync('config.json', 'UTF8'));
  config.publishTemplate(template)
      .then(function (updatedTemplate) {
        console.log('Template has been published');
        console.log('ETag from server: ' + updatedTemplate.etag);
      })
      .catch(function (err) {
        console.error('Unable to publish template.');
        console.error(err);
      });
}

Java

try {
  Template publishedTemplate = FirebaseRemoteConfig.getInstance()
          .publishTemplateAsync(template).get();
  System.out.println("Template has been published");
  // See the ETag of the published template.
  System.out.println("ETag from server: " + publishedTemplate.getETag());
} catch (ExecutionException e) {
  if (e.getCause() instanceof FirebaseRemoteConfigException) {
    FirebaseRemoteConfigException rcError = (FirebaseRemoteConfigException) e.getCause();
    System.out.println("Unable to publish template.");
    System.out.println(rcError.getMessage());
  }
}

REST

curl --compressed -H "Content-Type: application/json; UTF8" -H "If-Match: last-returned-etag" -H "Authorization: Bearer token" -X PUT https://firebaseremoteconfig.googleapis.com/v1/projects/my-project-id/remoteConfig -d @filename

For this curl command, you can specify the content by using the "@" character, followed by the filename.

REST

curl --compressed -D headers -H "Authorization: Bearer token -X GET https://firebaseremoteconfig.googleapis.com/v1/projects/my-project-id/remoteConfig:downloadDefaults?format=file_format'

Use XML, PLIST, or JSON as the format value, depending on which file format you want to download.

Firebase console

1. In the Parameters tab, open the more_vertMenu, and select Download default values.
2. When prompted, click the radio button that corresponds to the file format you want to download, and then click Download file.