diff --git a/.env.local b/.env.local
index 8d5f8e89..faf5afb2 100644
--- a/.env.local
+++ b/.env.local
@@ -1,6 +1,7 @@
 DATABASE_URL=sqlite://storage/database/data.db?mode=rwc
-TORRUST_IDX_BACK_CONFIG=
-TORRUST_IDX_BACK_USER_UID=1000
+TORRUST_INDEX_CONFIG=
+USER_ID=1000
 TORRUST_TRACKER_CONFIG=
 TORRUST_TRACKER_DATABASE_DRIVER=sqlite3
 TORRUST_TRACKER_API_ADMIN_TOKEN=MyAccessToken
+
diff --git a/compose.yaml b/compose.yaml
index 3ad56e74..fa968c41 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -67,7 +67,7 @@ services:
     environment:
       - MYSQL_ROOT_HOST=%
       - MYSQL_ROOT_PASSWORD=root_secret_password
-      - MYSQL_DATABASE=${TORRUST_IDX_BACK_MYSQL_DATABASE:-torrust_index_e2e_testing}
+      - MYSQL_DATABASE=${TORRUST_INDEX_MYSQL_DATABASE:-torrust_index_e2e_testing}
       - MYSQL_USER=db_user
       - MYSQL_PASSWORD=db_user_secret_password
     networks:
diff --git a/contrib/dev-tools/container/build.sh b/contrib/dev-tools/container/build.sh
index 21be00a3..e4dafebd 100755
--- a/contrib/dev-tools/container/build.sh
+++ b/contrib/dev-tools/container/build.sh
@@ -1,13 +1,13 @@
 #!/bin/bash
 
-TORRUST_IDX_BACK_USER_UID=${TORRUST_IDX_BACK_USER_UID:-1000}
-TORRUST_IDX_BACK_RUN_AS_USER=${TORRUST_IDX_BACK_RUN_AS_USER:-appuser}
+USER_ID=${USER_ID:-1000}
+TORRUST_INDEX_RUN_AS_USER=${TORRUST_INDEX_RUN_AS_USER:-appuser}
 
 echo "Building docker image ..."
-echo "TORRUST_IDX_BACK_USER_UID: $TORRUST_IDX_BACK_USER_UID"
-echo "TORRUST_IDX_BACK_RUN_AS_USER: $TORRUST_IDX_BACK_RUN_AS_USER"
+echo "USER_ID: $USER_ID"
+echo "TORRUST_INDEX_RUN_AS_USER: $TORRUST_INDEX_RUN_AS_USER"
 
 docker build \
-    --build-arg UID="$TORRUST_IDX_BACK_USER_UID" \
-    --build-arg RUN_AS_USER="$TORRUST_IDX_BACK_RUN_AS_USER" \
+    --build-arg UID="$USER_ID" \
+    --build-arg RUN_AS_USER="$TORRUST_INDEX_RUN_AS_USER" \
     -t torrust-index .
diff --git a/contrib/dev-tools/container/e2e/mysql/e2e-env-up.sh b/contrib/dev-tools/container/e2e/mysql/e2e-env-up.sh
index 73cd2fc6..e2af81f8 100755
--- a/contrib/dev-tools/container/e2e/mysql/e2e-env-up.sh
+++ b/contrib/dev-tools/container/e2e/mysql/e2e-env-up.sh
@@ -7,7 +7,7 @@ USER_ID=${USER_ID:-1000} \
     TORRUST_INDEX_CONFIG=$(cat ./share/default/config/index.container.mysql.toml) \
     TORRUST_INDEX_DATABASE_DRIVER="mysql" \
     TORRUST_INDEX_TRACKER_API_TOKEN="MyAccessToken" \
-    TORRUST_IDX_BACK_MYSQL_DATABASE="torrust_index_e2e_testing" \
+    TORRUST_INDEX_MYSQL_DATABASE="torrust_index_e2e_testing" \
     TORRUST_TRACKER_CONFIG=$(cat ./share/default/config/tracker.container.sqlite3.toml) \
     TORRUST_TRACKER_DATABASE_DRIVER="sqlite3" \
     TORRUST_TRACKER_API_ADMIN_TOKEN="MyAccessToken" \
diff --git a/contrib/dev-tools/container/e2e/mysql/run-e2e-tests.sh b/contrib/dev-tools/container/e2e/mysql/run-e2e-tests.sh
index a9e275d2..bee61a75 100755
--- a/contrib/dev-tools/container/e2e/mysql/run-e2e-tests.sh
+++ b/contrib/dev-tools/container/e2e/mysql/run-e2e-tests.sh
@@ -5,9 +5,9 @@ CURRENT_USER_ID=$(id -u)
 echo "User name: $CURRENT_USER_NAME"
 echo "User   id: $CURRENT_USER_ID"
 
-TORRUST_IDX_BACK_USER_UID=$CURRENT_USER_ID
+USER_ID=$CURRENT_USER_ID
 TORRUST_TRACKER_USER_UID=$CURRENT_USER_ID
-export TORRUST_IDX_BACK_USER_UID
+export USER_ID
 export TORRUST_TRACKER_USER_UID
 
 # todo: remove duplicate funtion
diff --git a/contrib/dev-tools/container/e2e/sqlite/run-e2e-tests.sh b/contrib/dev-tools/container/e2e/sqlite/run-e2e-tests.sh
index 9506bc91..bfd6bbf1 100755
--- a/contrib/dev-tools/container/e2e/sqlite/run-e2e-tests.sh
+++ b/contrib/dev-tools/container/e2e/sqlite/run-e2e-tests.sh
@@ -5,9 +5,9 @@ CURRENT_USER_ID=$(id -u)
 echo "User name: $CURRENT_USER_NAME"
 echo "User   id: $CURRENT_USER_ID"
 
-TORRUST_IDX_BACK_USER_UID=$CURRENT_USER_ID
+USER_ID=$CURRENT_USER_ID
 TORRUST_TRACKER_USER_UID=$CURRENT_USER_ID
-export TORRUST_IDX_BACK_USER_UID
+export USER_ID
 export TORRUST_TRACKER_USER_UID
 
 # todo: remove duplicate funtion
diff --git a/contrib/dev-tools/container/run.sh b/contrib/dev-tools/container/run.sh
index 19df5d3a..c967f788 100755
--- a/contrib/dev-tools/container/run.sh
+++ b/contrib/dev-tools/container/run.sh
@@ -1,11 +1,11 @@
 #!/bin/bash
 
-TORRUST_IDX_BACK_USER_UID=${TORRUST_IDX_BACK_USER_UID:-1000}
-TORRUST_IDX_BACK_CONFIG=$(cat config.toml)
+USER_ID=${USER_ID:-1000}
+TORRUST_INDEX_CONFIG=$(cat config.toml)
 
 docker run -it \
-    --user="$TORRUST_IDX_BACK_USER_UID" \
+    --user="$USER_ID" \
     --publish 3001:3001/tcp \
-    --env TORRUST_IDX_BACK_CONFIG="$TORRUST_IDX_BACK_CONFIG" \
+    --env TORRUST_INDEX_CONFIG="$TORRUST_INDEX_CONFIG" \
     --volume "$(pwd)/storage":"/app/storage" \
     torrust-index
diff --git a/src/bootstrap/config.rs b/src/bootstrap/config.rs
index 49f661ac..e6910a33 100644
--- a/src/bootstrap/config.rs
+++ b/src/bootstrap/config.rs
@@ -20,7 +20,7 @@ pub const ENV_VAR_PATH_CONFIG: &str = "TORRUST_INDEX_PATH_CONFIG";
 pub const DEFAULT_PATH_CONFIG: &str = "./share/default/config/index.development.sqlite3.toml";
 
 /// If present, CORS will be permissive.
-pub const ENV_VAR_CORS_PERMISSIVE: &str = "TORRUST_INDEX_BACK_CORS_PERMISSIVE";
+pub const ENV_VAR_CORS_PERMISSIVE: &str = "TORRUST_INDEX_API_CORS_PERMISSIVE";
 
 /// It loads the application configuration from the environment.
 ///
diff --git a/src/lib.rs b/src/lib.rs
index 397dc04f..039bdfeb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -110,9 +110,9 @@
 //!
 //! ```text
 //! mkdir -p ./storage/database \
-//!   && export TORRUST_IDX_BACK_USER_UID=1000 \
+//!   && export USER_ID=1000 \
 //!   && docker run -it \
-//!     --user="$TORRUST_IDX_BACK_USER_UID" \
+//!     --user="$USER_ID" \
 //!     --publish 3001:3001/tcp \
 //!     --volume "$(pwd)/storage":"/app/storage" \
 //!     torrust/index
@@ -204,10 +204,10 @@
 //!
 //! For more information about configuration you can visit the documentation for the [`config`]) module.
 //!
-//! Alternatively to the `config.toml` file you can use one environment variable `TORRUST_IDX_BACK_CONFIG` to pass the configuration to the tracker:
+//! Alternatively to the `config.toml` file you can use one environment variable `TORRUST_INDEX_CONFIG` to pass the configuration to the tracker:
 //!
 //! ```text
-//! TORRUST_IDX_BACK_CONFIG=$(cat config.toml)
+//! TORRUST_INDEX_CONFIG=$(cat config.toml)
 //! cargo run
 //! ```
 //!
@@ -215,9 +215,9 @@
 //!
 //! The env var contains the same data as the `config.toml`. It's particularly useful in you are [running the index with docker](https://github.com/torrust/torrust-index/tree/develop/docker).
 //!
-//! > **NOTICE**: The `TORRUST_IDX_BACK_CONFIG` env var has priority over the `config.toml` file.
+//! > **NOTICE**: The `TORRUST_INDEX_CONFIG` env var has priority over the `config.toml` file.
 //!
-//! > **NOTICE**: You can also change the location for the configuration file with the `TORRUST_IDX_BACK_CONFIG_PATH` env var.
+//! > **NOTICE**: You can also change the location for the configuration file with the `TORRUST_INDEX_CONFIG_PATH` env var.
 //!
 //! # Usage
 //!