Support comments in JSON body (#419)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

crates/yaak-common/src/serde.rs

@@ -21,3 +21,10 @@ pub fn get_str_map<'a>(v: &'a BTreeMap<String, Value>, key: &str) -> &'a str {
         Some(v) => v.as_str().unwrap_or_default(),
     }
 }
+
+pub fn get_bool_map(v: &BTreeMap<String, Value>, key: &str, fallback: bool) -> bool {
+    match v.get(key) {
+        None => fallback,
+        Some(v) => v.as_bool().unwrap_or(fallback),
+    }
+}

crates/yaak-http/Cargo.toml

@@ -29,4 +29,5 @@ tower-service = "0.3.3"
 urlencoding = "2.1.3"
 yaak-common = { workspace = true }
 yaak-models = { workspace = true }
+yaak-templates = { workspace = true }
 yaak-tls = { workspace = true }

crates/yaak-http/src/types.rs

@@ -9,8 +9,9 @@ use std::collections::BTreeMap;
 use std::pin::Pin;
 use std::time::Duration;
 use tokio::io::AsyncRead;
-use yaak_common::serde::{get_bool, get_str, get_str_map};
+use yaak_common::serde::{get_bool, get_bool_map, get_str, get_str_map};
 use yaak_models::models::HttpRequest;
+use yaak_templates::strip_json_comments::{maybe_strip_json_comments, strip_json_comments};
 
 pub(crate) const MULTIPART_BOUNDARY: &str = "------YaakFormBoundary";
 
@@ -134,16 +135,69 @@ pub fn append_query_params(url: &str, params: Vec<(String, String)>) -> String {
     result
 }
 
+fn strip_query_params(url: &str, names: &[&str]) -> String {
+    // Split off fragment
+    let (base_and_query, fragment) = if let Some(hash_pos) = url.find('#') {
+        (&url[..hash_pos], Some(&url[hash_pos..]))
+    } else {
+        (url, None)
+    };
+
+    let result = if let Some(q_pos) = base_and_query.find('?') {
+        let base = &base_and_query[..q_pos];
+        let query = &base_and_query[q_pos + 1..];
+        let filtered: Vec<&str> = query
+            .split('&')
+            .filter(|pair| {
+                let key = pair.split('=').next().unwrap_or("");
+                let decoded = urlencoding::decode(key).unwrap_or_default();
+                !names.contains(&decoded.as_ref())
+            })
+            .collect();
+        if filtered.is_empty() {
+            base.to_string()
+        } else {
+            format!("{}?{}", base, filtered.join("&"))
+        }
+    } else {
+        base_and_query.to_string()
+    };
+
+    match fragment {
+        Some(f) => format!("{}{}", result, f),
+        None => result,
+    }
+}
+
 fn build_url(r: &HttpRequest) -> String {
     let (url_string, params) = apply_path_placeholders(&ensure_proto(&r.url), &r.url_parameters);
-    append_query_params(
+    let mut url = append_query_params(
         &url_string,
         params
             .iter()
             .filter(|p| p.enabled && !p.name.is_empty())
             .map(|p| (p.name.clone(), p.value.clone()))
             .collect(),
-    )
+    );
+
+    // GraphQL GET requests encode query/variables as URL query parameters
+    if r.method.to_lowercase() == "get" && r.body_type.as_deref() == Some("graphql") {
+        url = append_graphql_query_params(&url, &r.body);
+    }
+
+    url
+}
+
+fn append_graphql_query_params(url: &str, body: &BTreeMap<String, serde_json::Value>) -> String {
+    let query = get_str_map(body, "query").to_string();
+    let variables = strip_json_comments(&get_str_map(body, "variables"));
+    let mut params = vec![("query".to_string(), query)];
+    if !variables.trim().is_empty() {
+        params.push(("variables".to_string(), variables));
+    }
+    // Strip existing query/variables params to avoid duplicates
+    let url = strip_query_params(url, &["query", "variables"]);
+    append_query_params(&url, params)
 }
 
 fn build_headers(r: &HttpRequest) -> Vec<(String, String)> {
@@ -177,7 +231,7 @@ async fn build_body(
             (build_form_body(&body), Some("application/x-www-form-urlencoded".to_string()))
         }
         "multipart/form-data" => build_multipart_body(&body, &headers).await?,
-        _ if body.contains_key("text") => (build_text_body(&body), None),
+        _ if body.contains_key("text") => (build_text_body(&body, body_type), None),
         t => {
             warn!("Unsupported body type: {}", t);
             (None, None)
@@ -252,13 +306,20 @@ async fn build_binary_body(
     }))
 }
 
-fn build_text_body(body: &BTreeMap<String, serde_json::Value>) -> Option<SendableBodyWithMeta> {
+fn build_text_body(body: &BTreeMap<String, serde_json::Value>, body_type: &str) -> Option<SendableBodyWithMeta> {
     let text = get_str_map(body, "text");
     if text.is_empty() {
-        None
-    } else {
-        Some(SendableBodyWithMeta::Bytes(Bytes::from(text.to_string())))
+        return None;
     }
+
+    let send_comments = get_bool_map(body, "sendJsonComments", false);
+    let text = if !send_comments && body_type == "application/json" {
+        maybe_strip_json_comments(text)
+    } else {
+        text.to_string()
+    };
+
+    Some(SendableBodyWithMeta::Bytes(Bytes::from(text)))
 }
 
 fn build_graphql_body(
@@ -266,7 +327,7 @@ fn build_graphql_body(
     body: &BTreeMap<String, serde_json::Value>,
 ) -> Option<SendableBodyWithMeta> {
     let query = get_str_map(body, "query");
-    let variables = get_str_map(body, "variables");
+    let variables = strip_json_comments(&get_str_map(body, "variables"));
 
     if method.to_lowercase() == "get" {
         // GraphQL GET requests use query parameters, not a body
@@ -684,7 +745,7 @@ mod tests {
         let mut body = BTreeMap::new();
         body.insert("text".to_string(), json!("Hello, World!"));
 
-        let result = build_text_body(&body);
+        let result = build_text_body(&body, "application/json");
         match result {
             Some(SendableBodyWithMeta::Bytes(bytes)) => {
                 assert_eq!(bytes, Bytes::from("Hello, World!"))
@@ -698,7 +759,7 @@ mod tests {
         let mut body = BTreeMap::new();
         body.insert("text".to_string(), json!(""));
 
-        let result = build_text_body(&body);
+        let result = build_text_body(&body, "application/json");
         assert!(result.is_none());
     }
 
@@ -706,10 +767,57 @@ mod tests {
     async fn test_text_body_missing() {
         let body = BTreeMap::new();
 
-        let result = build_text_body(&body);
+        let result = build_text_body(&body, "application/json");
         assert!(result.is_none());
     }
 
+    #[tokio::test]
+    async fn test_text_body_strips_json_comments_by_default() {
+        let mut body = BTreeMap::new();
+        body.insert("text".to_string(), json!("{\n  // comment\n  \"foo\": \"bar\"\n}"));
+
+        let result = build_text_body(&body, "application/json");
+        match result {
+            Some(SendableBodyWithMeta::Bytes(bytes)) => {
+                let text = String::from_utf8_lossy(&bytes);
+                assert!(!text.contains("// comment"));
+                assert!(text.contains("\"foo\": \"bar\""));
+            }
+            _ => panic!("Expected Some(SendableBody::Bytes)"),
+        }
+    }
+
+    #[tokio::test]
+    async fn test_text_body_send_json_comments_when_opted_in() {
+        let mut body = BTreeMap::new();
+        body.insert("text".to_string(), json!("{\n  // comment\n  \"foo\": \"bar\"\n}"));
+        body.insert("sendJsonComments".to_string(), json!(true));
+
+        let result = build_text_body(&body, "application/json");
+        match result {
+            Some(SendableBodyWithMeta::Bytes(bytes)) => {
+                let text = String::from_utf8_lossy(&bytes);
+                assert!(text.contains("// comment"));
+            }
+            _ => panic!("Expected Some(SendableBody::Bytes)"),
+        }
+    }
+
+    #[tokio::test]
+    async fn test_text_body_no_strip_for_non_json() {
+        let mut body = BTreeMap::new();
+        body.insert("text".to_string(), json!("// not json\nsome text"));
+
+        let result = build_text_body(&body, "text/plain");
+        match result {
+            Some(SendableBodyWithMeta::Bytes(bytes)) => {
+                let text = String::from_utf8_lossy(&bytes);
+                assert!(text.contains("// not json"));
+            }
+            _ => panic!("Expected Some(SendableBody::Bytes)"),
+        }
+    }
+
     #[tokio::test]
     async fn test_form_urlencoded_body() -> Result<()> {
         let mut body = BTreeMap::new();

crates/yaak-templates/src/format_json.rs

@@ -11,6 +11,7 @@ pub fn format_json(text: &str, tab: &str) -> String {
     let mut new_json = "".to_string();
     let mut depth = 0;
     let mut state = FormatState::None;
+    let mut saw_newline_in_whitespace = false;
 
     loop {
         let rest_of_chars = chars.clone();
@@ -61,6 +62,62 @@ pub fn format_json(text: &str, tab: &str) -> String {
             continue;
         }
 
+        // Handle line comments (//)
+        if current_char == '/' && chars.peek() == Some(&'/') {
+            chars.next(); // Skip second /
+            // Collect the rest of the comment until newline
+            let mut comment = String::from("//");
+            loop {
+                match chars.peek() {
+                    Some(&'\n') | None => break,
+                    Some(_) => comment.push(chars.next().unwrap()),
+                }
+            }
+            // Check if the comma handler already added \n + indent
+            let trimmed = new_json.trim_end_matches(|c: char| c == ' ' || c == '\t');
+            if trimmed.ends_with(",\n") && !saw_newline_in_whitespace {
+                // Trailing comment on the same line as comma (e.g. "foo",// comment)
+                new_json.truncate(trimmed.len() - 1);
+                new_json.push(' ');
+            } else if !trimmed.ends_with('\n') && !new_json.is_empty() {
+                // Trailing comment after a value (no newline before us)
+                new_json.push(' ');
+            }
+            new_json.push_str(&comment);
+            new_json.push('\n');
+            new_json.push_str(tab.to_string().repeat(depth).as_str());
+            saw_newline_in_whitespace = false;
+            continue;
+        }
+
+        // Handle block comments (/* ... */)
+        if current_char == '/' && chars.peek() == Some(&'*') {
+            chars.next(); // Skip *
+            let mut comment = String::from("/*");
+            loop {
+                match chars.next() {
+                    None => break,
+                    Some('*') if chars.peek() == Some(&'/') => {
+                        chars.next(); // Skip /
+                        comment.push_str("*/");
+                        break;
+                    }
+                    Some(c) => comment.push(c),
+                }
+            }
+            // If we're not already on a fresh line, add newline + indent before comment
+            let trimmed = new_json.trim_end_matches(|c: char| c == ' ' || c == '\t');
+            if !trimmed.is_empty() && !trimmed.ends_with('\n') {
+                new_json.push('\n');
+                new_json.push_str(tab.to_string().repeat(depth).as_str());
+            }
+            new_json.push_str(&comment);
+            // After block comment, add newline + indent for the next content
+            new_json.push('\n');
+            new_json.push_str(tab.to_string().repeat(depth).as_str());
+            continue;
+        }
+
         match current_char {
             ',' => {
                 new_json.push(current_char);
@@ -125,20 +182,37 @@ pub fn format_json(text: &str, tab: &str) -> String {
                     || current_char == '\t'
                     || current_char == '\r'
                 {
+                    if current_char == '\n' {
+                        saw_newline_in_whitespace = true;
+                    }
                     // Don't add these
                 } else {
+                    saw_newline_in_whitespace = false;
                     new_json.push(current_char);
                 }
             }
         }
     }
 
-    // Replace only lines containing whitespace with nothing
-    new_json
-        .lines()
-        .filter(|line| !line.trim().is_empty()) // Filter out whitespace-only lines
-        .collect::<Vec<&str>>() // Collect the non-empty lines into a vector
-        .join("\n") // Join the lines back into a single string
+    // Filter out whitespace-only lines, but preserve empty lines inside block comments
+    let mut result_lines: Vec<&str> = Vec::new();
+    let mut in_block_comment = false;
+    for line in new_json.lines() {
+        if in_block_comment {
+            result_lines.push(line);
+            if line.contains("*/") {
+                in_block_comment = false;
+            }
+        } else {
+            if line.contains("/*") && !line.contains("*/") {
+                in_block_comment = true;
+            }
+            if !line.trim().is_empty() {
+                result_lines.push(line);
+            }
+        }
+    }
+    result_lines.iter().map(|line| line.trim_end()).collect::<Vec<&str>>().join("\n")
 }
 
 #[cfg(test)]
@@ -297,6 +371,161 @@ mod tests {
             r#"
 {}
 }
+"#
+            .trim()
+        );
+    }
+
+    #[test]
+    fn test_line_comment_between_keys() {
+        assert_eq!(
+            format_json(
+                r#"{"foo":"bar",// a comment
+"baz":"qux"}"#,
+                "  "
+            ),
+            r#"
+{
+  "foo": "bar", // a comment
+  "baz": "qux"
+}
+"#
+            .trim()
+        );
+    }
+
+    #[test]
+    fn test_line_comment_at_end() {
+        assert_eq!(
+            format_json(
+                r#"{"foo":"bar" // trailing
+}"#,
+                "  "
+            ),
+            r#"
+{
+  "foo": "bar" // trailing
+}
+"#
+            .trim()
+        );
+    }
+
+    #[test]
+    fn test_block_comment() {
+        assert_eq!(
+            format_json(r#"{"foo":"bar",/* comment */"baz":"qux"}"#, "  "),
+            r#"
+{
+  "foo": "bar",
+  /* comment */
+  "baz": "qux"
+}
+"#
+            .trim()
+        );
+    }
+
+    #[test]
+    fn test_comment_in_array() {
+        assert_eq!(
+            format_json(
+                r#"[1,// item comment
+2,3]"#,
+                "  "
+            ),
+            r#"
+[
+  1, // item comment
+  2,
+  3
+]
+"#
+            .trim()
+        );
+    }
+
+    #[test]
+    fn test_comment_only_line() {
+        assert_eq!(
+            format_json(
+                r#"{
+  // this is a standalone comment
+  "foo": "bar"
+}"#,
+                "  "
+            ),
+            r#"
+{
+  // this is a standalone comment
+  "foo": "bar"
+}
+"#
+            .trim()
+        );
+    }
+
+    #[test]
+    fn test_multiline_block_comment() {
+        assert_eq!(
+            format_json(
+                r#"{
+  "foo": "bar"
+  /**
+   Hello World!
+
+   Hi there
+   */
+}"#,
+                "  "
+            ),
+            r#"
+{
+  "foo": "bar"
+  /**
+   Hello World!
+
+   Hi there
+   */
+}
+"#
+            .trim()
+        );
+    }
+
+    // NOTE: trailing whitespace on output lines is trimmed by the formatter.
+    // We can't easily add a test for this because raw string literals get
+    // trailing whitespace stripped by the editor/linter.
+
+    #[test]
+    fn test_comment_inside_string_ignored() {
+        assert_eq!(
+            format_json(r#"{"foo":"// not a comment","bar":"/* also not */"}"#, "  "),
+            r#"
+{
+  "foo": "// not a comment",
+  "bar": "/* also not */"
+}
+"#
+            .trim()
+        );
+    }
+
+    #[test]
+    fn test_comment_on_line_after_comma() {
+        assert_eq!(
+            format_json(
+                r#"{
+  "a": "aaa",
+  // "b": "bbb"
+}"#,
+                "  "
+            ),
+            r#"
+{
+  "a": "aaa",
+  // "b": "bbb"
+}
 "#
             .trim()
         );

crates/yaak-templates/src/lib.rs

@@ -1,6 +1,7 @@
 pub mod error;
 pub mod escape;
 pub mod format_json;
+pub mod strip_json_comments;
 pub mod parser;
 pub mod renderer;
 pub mod wasm;

crates/yaak-templates/src/strip_json_comments.rs

@@ -0,0 +1,318 @@
+/// Strips JSON comments only if the result is valid JSON. If stripping comments
+/// produces invalid JSON, the original text is returned unchanged.
+pub fn maybe_strip_json_comments(text: &str) -> String {
+    let stripped = strip_json_comments(text);
+    if serde_json::from_str::<serde_json::Value>(&stripped).is_ok() {
+        stripped
+    } else {
+        text.to_string()
+    }
+}
+
+/// Strips comments from JSONC, preserving the original formatting as much as possible.
+///
+/// - Trailing comments on a line are removed (along with preceding whitespace)
+/// - Whole-line comments are removed, including the line itself
+/// - Block comments are removed, including any lines that become empty
+/// - Comments inside strings and template tags are left alone
+pub fn strip_json_comments(text: &str) -> String {
+    let mut chars = text.chars().peekable();
+    let mut result = String::with_capacity(text.len());
+    let mut in_string = false;
+    let mut in_template_tag = false;
+
+    loop {
+        let current_char = match chars.next() {
+            None => break,
+            Some(c) => c,
+        };
+
+        // Handle JSON strings
+        if in_string {
+            result.push(current_char);
+            match current_char {
+                '"' => in_string = false,
+                '\\' => {
+                    if let Some(c) = chars.next() {
+                        result.push(c);
+                    }
+                }
+                _ => {}
+            }
+            continue;
+        }
+
+        // Handle template tags
+        if in_template_tag {
+            result.push(current_char);
+            if current_char == ']' && chars.peek() == Some(&'}') {
+                result.push(chars.next().unwrap());
+                in_template_tag = false;
+            }
+            continue;
+        }
+
+        // Check for template tag start
+        if current_char == '$' && chars.peek() == Some(&'{') {
+            let mut lookahead = chars.clone();
+            lookahead.next(); // skip {
+            if lookahead.peek() == Some(&'[') {
+                in_template_tag = true;
+                result.push(current_char);
+                result.push(chars.next().unwrap()); // {
+                result.push(chars.next().unwrap()); // [
+                continue;
+            }
+        }
+
+        // Check for line comment
+        if current_char == '/' && chars.peek() == Some(&'/') {
+            chars.next(); // skip second /
+            // Consume until newline
+            loop {
+                match chars.peek() {
+                    Some(&'\n') | None => break,
+                    Some(_) => {
+                        chars.next();
+                    }
+                }
+            }
+            // Trim trailing whitespace that preceded the comment
+            let trimmed_len = result.trim_end_matches(|c: char| c == ' ' || c == '\t').len();
+            result.truncate(trimmed_len);
+            continue;
+        }
+
+        // Check for block comment
+        if current_char == '/' && chars.peek() == Some(&'*') {
+            chars.next(); // skip *
+            // Consume until */
+            loop {
+                match chars.next() {
+                    None => break,
+                    Some('*') if chars.peek() == Some(&'/') => {
+                        chars.next(); // skip /
+                        break;
+                    }
+                    Some(_) => {}
+                }
+            }
+            // Trim trailing whitespace that preceded the comment
+            let trimmed_len = result.trim_end_matches(|c: char| c == ' ' || c == '\t').len();
+            result.truncate(trimmed_len);
+            // Skip whitespace/newline after the block comment if the next line is content
+            // (this handles the case where the block comment is on its own line)
+            continue;
+        }
+
+        if current_char == '"' {
+            in_string = true;
+        }
+
+        result.push(current_char);
+    }
+
+    // Remove lines that are now empty (were comment-only lines)
+    let result = result
+        .lines()
+        .filter(|line| !line.trim().is_empty())
+        .collect::<Vec<&str>>()
+        .join("\n");
+
+    // Remove trailing commas before } or ]
+    strip_trailing_commas(&result)
+}
+
+/// Removes trailing commas before closing braces/brackets, respecting strings.
+fn strip_trailing_commas(text: &str) -> String {
+    let mut result = String::with_capacity(text.len());
+    let chars: Vec<char> = text.chars().collect();
+    let mut i = 0;
+    let mut in_string = false;
+
+    while i < chars.len() {
+        let ch = chars[i];
+
+        if in_string {
+            result.push(ch);
+            match ch {
+                '"' => in_string = false,
+                '\\' => {
+                    i += 1;
+                    if i < chars.len() {
+                        result.push(chars[i]);
+                    }
+                }
+                _ => {}
+            }
+            i += 1;
+            continue;
+        }
+
+        if ch == '"' {
+            in_string = true;
+            result.push(ch);
+            i += 1;
+            continue;
+        }
+
+        if ch == ',' {
+            // Look ahead past whitespace/newlines for } or ]
+            let mut j = i + 1;
+            while j < chars.len() && chars[j].is_whitespace() {
+                j += 1;
+            }
+            if j < chars.len() && (chars[j] == '}' || chars[j] == ']') {
+                // Skip the comma
+                i += 1;
+                continue;
+            }
+        }
+
+        result.push(ch);
+        i += 1;
+    }
+
+    result
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::strip_json_comments::strip_json_comments;
+
+    #[test]
+    fn test_no_comments() {
+        let input = r#"{
+  "foo": "bar",
+  "baz": 123
+}"#;
+        assert_eq!(strip_json_comments(input), input);
+    }
+
+    #[test]
+    fn test_trailing_line_comment() {
+        assert_eq!(
+            strip_json_comments(r#"{
+  "foo": "bar", // this is a comment
+  "baz": 123
+}"#),
+            r#"{
+  "foo": "bar",
+  "baz": 123
+}"#
+        );
+    }
+
+    #[test]
+    fn test_whole_line_comment() {
+        assert_eq!(
+            strip_json_comments(r#"{
+  // this is a comment
+  "foo": "bar"
+}"#),
+            r#"{
+  "foo": "bar"
+}"#
+        );
+    }
+
+    #[test]
+    fn test_inline_block_comment() {
+        assert_eq!(
+            strip_json_comments(r#"{
+  "foo": /* a comment */ "bar"
+}"#),
+            r#"{
+  "foo": "bar"
+}"#
+        );
+    }
+
+    #[test]
+    fn test_whole_line_block_comment() {
+        assert_eq!(
+            strip_json_comments(r#"{
+  /* a comment */
+  "foo": "bar"
+}"#),
+            r#"{
+  "foo": "bar"
+}"#
+        );
+    }
+
+    #[test]
+    fn test_multiline_block_comment() {
+        assert_eq!(
+            strip_json_comments(r#"{
+  /**
+   * Hello World!
+   */
+  "foo": "bar"
+}"#),
+            r#"{
+  "foo": "bar"
+}"#
+        );
+    }
+
+    #[test]
+    fn test_comment_inside_string_preserved() {
+        let input = r#"{
+  "foo": "// not a comment",
+  "bar": "/* also not */"
+}"#;
+        assert_eq!(strip_json_comments(input), input);
+    }
+
+    #[test]
+    fn test_comment_inside_template_tag_preserved() {
+        let input = r#"{
+  "foo": ${[ fn("// hi", "/* hey */") ]}
+}"#;
+        assert_eq!(strip_json_comments(input), input);
+    }
+
+    #[test]
+    fn test_multiple_comments() {
+        assert_eq!(
+            strip_json_comments(r#"{
+  // first comment
+  "foo": "bar", // trailing
+  /* block */
+  "baz": 123
+}"#),
+            r#"{
+  "foo": "bar",
+  "baz": 123
+}"#
+        );
+    }
+
+    #[test]
+    fn test_trailing_comma_after_comment_removed() {
+        assert_eq!(
+            strip_json_comments(r#"{
+  "a": "aaa",
+  // "b": "bbb"
+}"#),
+            r#"{
+  "a": "aaa"
+}"#
+        );
+    }
+
+    #[test]
+    fn test_trailing_comma_in_array() {
+        assert_eq!(
+            strip_json_comments(r#"[1, 2, /* 3 */]"#),
+            r#"[1, 2]"#
+        );
+    }
+
+    #[test]
+    fn test_comma_inside_string_preserved() {
+        let input = r#"{"a": "hello,}"#;
+        assert_eq!(strip_json_comments(input), input);
+    }
+}

crates/yaak/src/render.rs

@@ -2,7 +2,7 @@ use log::info;
 use serde_json::Value;
 use std::collections::BTreeMap;
 use yaak_http::path_placeholders::apply_path_placeholders;
-use yaak_models::models::{Environment, HttpRequest, HttpRequestHeader, HttpUrlParameter};
+use yaak_models::models::{Environment, GrpcRequest, HttpRequest, HttpRequestHeader, HttpUrlParameter};
 use yaak_models::render::make_vars_hashmap;
 use yaak_templates::{RenderOptions, TemplateCallback, parse_and_render, render_json_value_raw};
 
@@ -89,6 +89,64 @@ pub async fn render_http_request<T: TemplateCallback>(
     Ok(HttpRequest { url, url_parameters, headers, body, authentication, ..request.to_owned() })
 }
 
+pub async fn render_grpc_request<T: TemplateCallback>(
+    r: &GrpcRequest,
+    environment_chain: Vec<Environment>,
+    cb: &T,
+    opt: &RenderOptions,
+) -> yaak_templates::error::Result<GrpcRequest> {
+    let vars = &make_vars_hashmap(environment_chain);
+
+    let mut metadata = Vec::new();
+    for p in r.metadata.clone() {
+        if !p.enabled {
+            continue;
+        }
+        metadata.push(HttpRequestHeader {
+            enabled: p.enabled,
+            name: parse_and_render(p.name.as_str(), vars, cb, opt).await?,
+            value: parse_and_render(p.value.as_str(), vars, cb, opt).await?,
+            id: p.id,
+        })
+    }
+
+    let authentication = {
+        let mut disabled = false;
+        let mut auth = BTreeMap::new();
+        match r.authentication.get("disabled") {
+            Some(Value::Bool(true)) => {
+                disabled = true;
+            }
+            Some(Value::String(tmpl)) => {
+                disabled = parse_and_render(tmpl.as_str(), vars, cb, opt)
+                    .await
+                    .unwrap_or_default()
+                    .is_empty();
+                info!(
+                    "Rendering authentication.disabled as a template: {disabled} from \"{tmpl}\""
+                );
+            }
+            _ => {}
+        }
+        if disabled {
+            auth.insert("disabled".to_string(), Value::Bool(true));
+        } else {
+            for (k, v) in r.authentication.clone() {
+                if k == "disabled" {
+                    auth.insert(k, Value::Bool(false));
+                } else {
+                    auth.insert(k, render_json_value_raw(v, vars, cb, opt).await?);
+                }
+            }
+        }
+        auth
+    };
+
+    let url = parse_and_render(r.url.as_str(), vars, cb, opt).await?;
+
+    Ok(GrpcRequest { url, metadata, authentication, ..r.to_owned() })
+}
+
 fn strip_disabled_form_entries(v: Value) -> Value {
     match v {
         Value::Array(items) => Value::Array(