diff --git a/readme.md b/readme.md
index c51ce97..9eafa28 100644
--- a/readme.md
+++ b/readme.md
@@ -340,6 +340,7 @@ Content-Type: application/json
 `haskell`,
 `husk`,
 `iverilog`,
+`j`,
 `japt`,
 `java`,
 `javascript`,
diff --git a/runtimes/902-j.nix b/runtimes/902-j.nix
new file mode 100644
index 0000000..5cd2868
--- /dev/null
+++ b/runtimes/902-j.nix
@@ -0,0 +1,68 @@
+{pkgs, piston, ...}:
+let
+    # Put your package here, preferibly from nixpkgs.
+    pkg = pkgs.902; # this may be incorrect - it is guessed
+in piston.mkRuntime {
+    # Name of the language implemented by this runtime
+    language = "j";
+    
+    # The version of the language
+    # Usually this is specified on the package
+    version = pkg.version;
+
+    # Name of the runtime
+    # This line should be kept if the runtime differs from the language
+    runtime = "902";
+
+    aliases = [
+        # Put extensions in here, and other common names
+        # Example:
+        # "js"
+        # "node-javascript"
+    ];
+
+
+
+    # This is the lines of a shell script to compile source code.
+    # Arguments passed to this script are all the provided source files
+    # The CWD of this script is a temp directory for a job
+    #
+    # If the language only supports JIT compiling, simply remove this line
+    # See ./python3.nix and ./node-javascript.nix for examples
+    #
+    # No shebang needs to be added to this - that is done automatically.
+    compile = ''
+    ${pkg}/bin/902 --compile "$@"
+    '';
+
+    # This is the lines of a shell script to evaluate a file at $1
+    # The remaining arguments are the arguments to launch the application with
+    # The CWD of this script is a temp directory for a job
+    #
+    # If the compile stage is used, $1 still contains the name of the source file.
+    # It is up to your script to determine the filename of the emitted binary
+    #
+    # No shebang needs to be added to this - that is done automatically.
+    run = ''
+    ${pkg}/bin/902 "$@"
+    '';
+
+    # Specify a list of tests.
+    # These should output "OK" to STDOUT if everything looks good
+    # 
+    # Run the following command to test the package:
+    # $ ./piston test 902-j
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.js" = ''
+                    console.log("OK");
+                '';
+            };
+            args = [];
+            stdin = "";
+            packages = [];
+            main = "test.js";
+        })
+    ];
+}
\ No newline at end of file
diff --git a/runtimes/default.nix b/runtimes/default.nix
index 140fd83..885b864 100644
--- a/runtimes/default.nix
+++ b/runtimes/default.nix
@@ -51,4 +51,5 @@ args: {
     "gcc-fortran" = import ./gcc-fortran.nix args;
     "yabasic" = import ./yabasic.nix args;
     "emacs" = import ./emacs.nix args;
+    "j" = import ./j.nix args;
 }
diff --git a/runtimes/j.nix b/runtimes/j.nix
new file mode 100644
index 0000000..667797f
--- /dev/null
+++ b/runtimes/j.nix
@@ -0,0 +1,68 @@
+{pkgs, piston, ...}:
+let
+    # Put your package here, preferibly from nixpkgs.
+    pkg = pkgs.j; # this may be incorrect - it is guessed
+in piston.mkRuntime {
+    # Name of the language implemented by this runtime
+    language = "j";
+    
+    # The version of the language
+    # Usually this is specified on the package
+    version = pkg.version;
+
+    # Name of the runtime
+    # This line should be kept if the runtime differs from the language
+    runtime = "j";
+
+    aliases = [
+        # Put extensions in here, and other common names
+        # Example:
+        # "js"
+        # "node-javascript"
+    ];
+
+
+
+    # This is the lines of a shell script to compile source code.
+    # Arguments passed to this script are all the provided source files
+    # The CWD of this script is a temp directory for a job
+    #
+    # If the language only supports JIT compiling, simply remove this line
+    # See ./python3.nix and ./node-javascript.nix for examples
+    #
+    # No shebang needs to be added to this - that is done automatically.
+    compile = ''
+    ${pkg}/bin/j --compile "$@"
+    '';
+
+    # This is the lines of a shell script to evaluate a file at $1
+    # The remaining arguments are the arguments to launch the application with
+    # The CWD of this script is a temp directory for a job
+    #
+    # If the compile stage is used, $1 still contains the name of the source file.
+    # It is up to your script to determine the filename of the emitted binary
+    #
+    # No shebang needs to be added to this - that is done automatically.
+    run = ''
+    ${pkg}/bin/j "$@"
+    '';
+
+    # Specify a list of tests.
+    # These should output "OK" to STDOUT if everything looks good
+    # 
+    # Run the following command to test the package:
+    # $ ./piston test j
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.js" = ''
+                    console.log("OK");
+                '';
+            };
+            args = [];
+            stdin = "";
+            packages = [];
+            main = "test.js";
+        })
+    ];
+}
\ No newline at end of file