Error while running compose up. YAML linter showing no errors - docker-compose

Question

I keep getting a service 'image' error when running docker-compose up for my yml file.
I researched online and it seems like it was mostly some formatting error.
I have run my yml through a YAML linter and there are no errors.
version: '3.5'
services:
server:
image: postgrest/postgrest
ports:
- "3000:3000"
links:
- db:db
environment:
PGRST_DB_URI: postgres://app_user:password#db:5432/app_db
PGRST_DB_SCHEMA: public
PGRST_DB_ANON_ROLE: app_user
depends_on:
- db
db:
image: postgres
ports:
- "5432:5432"
environment:
POSTGRES_USER: ${POSTGRES_USER:-postgres}
POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-changeme}
PGDATA: /data/postgres
volumes:
- postgres:/data/postgres
networks:
- postgres
restart: unless-stopped
pgadmin:
container_name: pgadmin_container
image: dpage/pgadmin4
environment:
PGADMIN_DEFAULT_EMAIL: ${PGADMIN_DEFAULT_EMAIL:-pgadmin4#pgadmin.org}
PGADMIN_DEFAULT_PASSWORD: ${PGADMIN_DEFAULT_PASSWORD:-admin}
volumes :
- pgadmin:/root/.pgadmin
ports:
-"${PGADMIN_PORT:-5050}:80"
networks:
- postgres
restart: unless-stopped
networks:
postgres:
driver: bridge
volumes:
postgres:
pgadmin:
swagger:
image: swaggerapi/swagger-ui
ports:
- "8080:8080"
expose:
- "8080"
environment:
API_URL: http://localhost:3000/
Expected would be the images get downloaded and containers get started up
Error is:
ERROR: In file '.\docker-compose.yml', service 'image' must be a mapping not a string.

Answer 1

This issue happens because of indentation.
docker-compose deals with image like a service because of wrong indentation.
I modified your file and start configured containers successfully:
version: "3.5"
services:
server:
image: postgrest/postgrest
ports:
- "3000:3000"
links:
- db:db
environment:
PGRST_DB_URI: postgres://app_user:password#db:5432/app_db
PGRST_DB_SCHEMA: public
PGRST_DB_ANON_ROLE: app_user
depends_on:
- db
db:
image: postgres
ports:
- "5432:5432"
environment:
POSTGRES_USER: ${PGADMIN_DEFAULT_EMAIL:-pgadmin4#pgadmin.org}
POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-changeme}
PGDATA: /data/postgres
volumes:
- postgres:/data/postgres
networks:
- postgres
restart: unless-stopped
pgadmin:
container_name: pgadmin_container
image: dpage/pgadmin4
environment:
PGADMIN_DEFAULT_EMAIL: ${PGADMIN_DEFAULT_EMAIL:-pgadmin4#pgadmin.org}
PGADMIN_DEFAULT_PASSWORD: ${PGADMIN_DEFAULT_PASSWORD:-admin}
volumes:
- pgadmin:/root/.pgadmin
ports:
- "${PGADMIN_PORT:-5050}:80"
networks:
- postgres
restart: unless-stopped
swagger:
image: swaggerapi/swagger-ui
ports:
- "8080:8080"
expose:
- "8080"
environment:
API_URL: http://localhost:3000/
networks:
postgres:
driver: bridge
volumes:
pgadmin:
postgres: