diff --git a/README.md b/README.md
index c625391..770cdf5 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,10 @@ nim c -r -d:noColors testing_script.nim
 
 # No colors, quiet output
 nim c -r -d:quiet -d:noColors testing_script.nim
+
+# With Node.js as a target
+nim js -d:nodejs -r testing_script.nim
+
 ```
 
 ### Usage
diff --git a/einheit.nimble b/einheit.nimble
index 5bba439..393e0c8 100644
--- a/einheit.nimble
+++ b/einheit.nimble
@@ -12,3 +12,6 @@ requires "nim >= 0.17.0"
 
 task test, "Run tests":
   exec "nim c -r tests/test.nim"
+
+task testjs, "Run tests on Node.js":
+  exec "nim js -d:nodejs -r tests/test.nim"
diff --git a/src/einheit.nim b/src/einheit.nim
index 77c9a78..a78f332 100644
--- a/src/einheit.nim
+++ b/src/einheit.nim
@@ -17,7 +17,10 @@ import unicode
 import strutils except toLower
 import tables
 import typetraits
-when not defined(ECMAScript):
+when defined(ECMAScript):
+  const noColors = true
+else:
+  const noColors = defined(noColors)
   import terminal
 import einheit/utils
 
@@ -544,7 +547,7 @@ macro testSuite*(head: untyped, body: untyped): untyped =
     try:
       testCall
       when defined(quiet):
-        when defined(noColors):
+        when noColors:
           stdout.write(".")
         else:
           setForegroundColor(fgGreen)
@@ -555,7 +558,7 @@ macro testSuite*(head: untyped, body: untyped): untyped =
         if self.lastTestFailed:
           okStr = "\l" & okStr
 
-        when not defined(noColors):
+        when not noColors:
           styledEcho(styleBright, fgGreen, okStr,
                      fgWhite, "     ", self.currentTestName)
         else:
@@ -567,14 +570,14 @@ macro testSuite*(head: untyped, body: untyped): untyped =
       let e = (ref TestAssertError)(getCurrentException())
 
       when defined(quiet):
-        when defined(noColors):
+        when noColors:
           stdout.write("F")
         else:
           setForegroundColor(fgRed)
           writeStyled("F", {styleBright})
           setForegroundColor(fgWhite)
       else:
-        when not defined(noColors):
+        when not noColors:
           styledEcho(styleBright,
                      fgRed, "\l[Failed]",
                      fgWhite, " ", self.currentTestName)
@@ -588,7 +591,7 @@ macro testSuite*(head: untyped, body: untyped): untyped =
           filename = e.fileName
           vals = e.valTable
 
-        when not defined(noColors):
+        when not noColors:
           styledEcho(styleDim, fgWhite, "  Condition: $2($1)\l".format(snip, name), "  Where:")
           for k, v in vals.pairs:
             styledEcho(styleDim, fgCyan, "    ", k,
@@ -742,7 +745,7 @@ proc printRunning(suite: TestSuite) =
     ticks &= "-"
 
   when not defined(quiet):
-    when not defined(noColors):
+    when not noColors:
       styledEcho(styleBright,
                   fgYellow, "\l"&ticks,
                   fgYellow, "\l\l[Running]",
@@ -753,16 +756,17 @@ proc printRunning(suite: TestSuite) =
 
 
 proc printPassedTests(suite: TestSuite) =
-  # Output red if tests didn't pass, green otherwise
-  var color = fgGreen
+  when not noColors:
+    # Output red if tests didn't pass, green otherwise
+    var color = fgGreen
 
-  if suite.testsPassed != suite.numTests:
-    color = fgRed
+    if suite.testsPassed != suite.numTests:
+      color = fgRed
 
   var passedStr = "[" & $suite.testsPassed & "/" & $suite.numTests & "]"
 
   when not defined(quiet):
-    when not defined(noColors):
+    when not noColors:
       styledEcho(styleBright, color,
                   "\l", passedStr,
                   fgWhite, " tests passed for ", suite.name, ".")
@@ -770,15 +774,16 @@ proc printPassedTests(suite: TestSuite) =
       echo "\l$1 tests passed for $2.".format(passedStr, suite.name)
 
 proc printSummary(totalTestsPassed: int, totalTests: int) =
-  var summaryColor = fgGreen
+  when not noColors:
+    var summaryColor = fgGreen
 
-  if totalTestsPassed != totalTests:
-    summaryColor = fgRed
+    if totalTestsPassed != totalTests:
+      summaryColor = fgRed
 
   var passedStr = "[" & $totalTestsPassed & "/" & $totalTests & "]"
 
   when defined(quiet):
-    when not defined(noColors):
+    when not noColors:
       styledEcho(styleBright, summaryColor,
                  "\l\l", passedStr,
                  fgWhite, " tests passed.")
@@ -795,7 +800,7 @@ proc printSummary(totalTestsPassed: int, totalTests: int) =
     for i in 0..<numTicks:
       ticks &= "-"
 
-    when not defined(noColors):
+    when not noColors:
       styledEcho(styleBright,
                  fgYellow, "\l$1\l".format(ticks),
                  fgYellow, "\l[Summary]")
diff --git a/src/einheit/utils.nim b/src/einheit/utils.nim
index 9040e41..1248ace 100644
--- a/src/einheit/utils.nim
+++ b/src/einheit/utils.nim
@@ -36,6 +36,22 @@ when defined(windows):
 
     return (rows.int, cols.int)
 
+elif defined(ECMAScript) and defined(nodejs):
+  type
+    StreamObj {.importc.} = object
+      columns: int
+      rows: int
+
+    ProcessObj {.importc.} = object
+      stdout: ref StreamObj
+
+  var
+    process {.importc, nodecl.}: ref ProcessObj
+  
+  proc getTermSize*(): (int, int) =
+    let t = process.stdout
+    return (t.rows, t.columns)
+
 else:
   import posix
   type