diff --git a/src/env.rs b/src/env.rs
index 8829955..9bca058 100644
--- a/src/env.rs
+++ b/src/env.rs
@@ -76,13 +76,22 @@ pub fn get_env() -> Env {
     }
 }
 
-pub fn get_env_bool(key: &str) -> bool {
-    get_env_var(key).map_or(false, |var| var.to_lowercase() == "true")
+pub fn get_env_bool(key: &str) -> Option<bool> {
+    get_env_var(key).map(|var| match var.to_lowercase().as_str() {
+        "true" => true,
+        "false" => false,
+        "t" => true,
+        "f" => false,
+        "1" => true,
+        "0" => false,
+        str => panic!("invalid bool {str} for {key}"),
+    })
 }
 
 #[derive(Debug, Clone)]
 pub struct EnvConfig {
     pub env: Env,
+    pub log_json: bool,
     pub log_perf: bool,
     pub s3_bucket: String,
 }
@@ -90,7 +99,8 @@ pub struct EnvConfig {
 fn get_env_config() -> EnvConfig {
     EnvConfig {
         env: get_env(),
-        log_perf: get_env_bool("LOG_PERF"),
+        log_json: get_env_bool("LOG_JSON").unwrap_or(get_env() != Env::Dev),
+        log_perf: get_env_bool("LOG_PERF").unwrap_or(false),
         s3_bucket: get_env_var("S3_BUCKET").unwrap_or("block-submission-archive-dev".to_string()),
     }
 }
@@ -130,7 +140,7 @@ mod tests {
     #[test]
     fn test_get_env_bool_not_there() {
         let flag = get_env_bool("DOESNT_EXIST");
-        assert!(!flag);
+        assert_eq!(flag, None);
     }
 
     #[test]
@@ -138,7 +148,7 @@ mod tests {
         let test_key = "TEST_KEY_BOOL_TRUE";
         let test_value = "true";
         std::env::set_var(test_key, test_value);
-        assert!(get_env_bool(test_key));
+        assert_eq!(get_env_bool(test_key), Some(true));
     }
 
     #[test]
@@ -146,7 +156,7 @@ mod tests {
         let test_key = "TEST_KEY_BOOL_TRUE2";
         let test_value = "TRUE";
         std::env::set_var(test_key, test_value);
-        assert!(get_env_bool(test_key));
+        assert_eq!(get_env_bool(test_key), Some(true));
     }
 
     #[test]
@@ -154,7 +164,7 @@ mod tests {
         let test_key = "TEST_KEY_BOOL_FALSE";
         let test_value = "false";
         std::env::set_var(test_key, test_value);
-        assert!(!get_env_bool(test_key));
+        assert_eq!(get_env_bool(test_key), Some(false));
     }
 
     #[test]
diff --git a/src/log.rs b/src/log.rs
index 3609401..481b17b 100644
--- a/src/log.rs
+++ b/src/log.rs
@@ -1,53 +1,19 @@
-use std::env;
-
 use tracing_subscriber::{fmt::format::FmtSpan, EnvFilter};
 
-fn get_env() -> &'static str {
-    let env_str = std::env::var("ENV");
-    match env_str {
-        Err(env::VarError::NotPresent) => {
-            println!("no ENV in env, assuming dev");
-            "dev"
-        }
-        Ok(str) => match str.as_ref() {
-            "dev" => "dev",
-            "development" => "dev",
-            "stag" => "stag",
-            "staging" => "stag",
-            "prod" => "prod",
-            "production" => "prod",
-            _ => {
-                panic!("ENV present: {str}, but not one of dev, stag, prod, panicking!")
-            }
-        },
-        err => {
-            panic!("error getting ENV from env: {:?}", err)
-        }
-    }
-}
+use crate::env::ENV_CONFIG;
 
 pub fn init() {
-    // We want to load log before env, we can't use our env module here.
-    let log_perf = std::env::var("LOG_PERF")
-        .map(|s| s == "true" || s == "1")
-        .unwrap_or(false);
+    let builder = tracing_subscriber::fmt().with_env_filter(EnvFilter::from_default_env());
 
-    let span_format = if log_perf {
-        FmtSpan::CLOSE
+    let builder = if ENV_CONFIG.log_perf {
+        builder.with_span_events(FmtSpan::CLOSE)
     } else {
-        FmtSpan::NONE
+        builder
     };
 
-    if get_env() == "dev" {
-        tracing_subscriber::fmt()
-            .with_span_events(span_format)
-            .with_env_filter(EnvFilter::from_default_env())
-            .init();
+    if ENV_CONFIG.log_json {
+        builder.json().init();
     } else {
-        tracing_subscriber::fmt()
-            .with_span_events(span_format)
-            .with_env_filter(EnvFilter::from_default_env())
-            .json()
-            .init();
-    }
+        builder.init();
+    };
 }