ECS Task Definition container_definitions is invalid: Error decoding JSON: invalid character 'f' after object key:value pair - terraform-provider-aws

Question

I´m getting: [Error] invalid character 'f' after object key:value pair How can I tell what is the (f) that is causing the error? is not quite descriptive the output like in some other languages that tells you the line number at least.
{
"name": "${name}",
"ulimits": [
{
"name": "nofile",
"hardLimit": 204800,
"softLimit": 102400
}
],
"image": "${ecr_url}/${image_name}:${image_tag}",
"cpu": "${container_cpu}",
"memory": null,
"memoryReservation": "${container_memory}",
"command": [
"/bin/sh",
"-c",
"export DD_AGENT_HOST=$(curl --silent http://169.254.169.254/latest/meta-data/local-ipv4); /usr/bin/$APPLICATION_ARTIFACTS"
],
"essential": true,
"mountPoints": [],
"portMappings": [
{
"containerPort": "${container_port}",
"hostPort": 0,
"protocol": "tcp"
}
],
"volumesFrom": [],
"dockerLabels": {
"application": "${application}",
"environment": "${environment}",
"version": "${image_tag}"
},
"logConfiguration": {
"logDriver": "${log_driver}",
"options": "${log_configuration}"
},
"environment": [
{
"name": "AWS_REGION",
"value": "${task_region}"
},
{
"name": "APPLICATION_ARTIFACTS",
"value": "${application_artifacts}"
},
{
"name": "ENVIRONMENT",
"value": "${environment}"
},
{
"name": "VERSION",
"value": "${image_tag}"
},
{
"name": "SERVER_PORT",
"value": "${container_port}"
},
{
"name": "DD_TRACE_SAMPLE_RATE",
"value": "1.0"
},
{
"name": "DD_LOGS_INJECTION",
"value": "false"
},
{
"name": "DD_ENV",
"value": "${DD_ENV}"
},
{
"name": "DD_SERVICE",
"value": "${DD_SERVICE}"
},
{
"name": "TABLE_NAME",
"value": "${table_name}"
}
]
}
I´m getting: [Error] invalid character 'f' after object key:value pair
How can I tell what is the (f) that is causing the error? is not quite descriptive the output like in some other languages that tells you the line number at least.
Error: ECS Task Definition container_definitions is invalid: Error decoding JSON: invalid character 'f' after object key:value pair
on deployment/terraform/service-blue.tf line 89, in resource "aws_ecs_task_definition" "default_blue":
89: container_definitions = local.require_blue_service ? data.aws_s3_object.container_definition_blue[0].body : data.template_file.container_definitions.rendered