diff --git a/package-lock.json b/package-lock.json
index 3deb7a6..057a87c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,18 +1,18 @@
 {
 	"name": "terrain50-cli",
-	"version": "1.0.0",
+	"version": "1.0.1",
 	"lockfileVersion": 1,
 	"requires": true,
 	"dependencies": {
 		"@iarna/toml": {
-			"version": "2.2.3",
-			"resolved": "https://registry.npmjs.org/@iarna/toml/-/toml-2.2.3.tgz",
-			"integrity": "sha512-FmuxfCuolpLl0AnQ2NHSzoUKWEJDFl63qXjzdoWBVyFCXzMGm1spBzk7LeHNoVCiWCF7mRVms9e6jEV9+MoPbg=="
+			"version": "2.2.5",
+			"resolved": "https://registry.npmjs.org/@iarna/toml/-/toml-2.2.5.tgz",
+			"integrity": "sha512-trnsAYxU3xnS1gPHPyU961coFyLkh4gAD/0zQ5mymY4yOZ+CYvsPqUbOFSw0aDM4y0tV7tiFxL/1XfXPNC6IPg=="
 		},
 		"applause-cli": {
-			"version": "1.2.0",
-			"resolved": "https://registry.npmjs.org/applause-cli/-/applause-cli-1.2.0.tgz",
-			"integrity": "sha512-JPCHkBzaghitUPYWK4Jm6YNUklJIBjhlvzU3WLswjvjolMyQN8WVWR8qrGmMbs1skej2p/ZINisZVVvmuEFkog=="
+			"version": "1.2.2",
+			"resolved": "https://registry.npmjs.org/applause-cli/-/applause-cli-1.2.2.tgz",
+			"integrity": "sha512-JB5PHttRc5bQhEIw3Hki4NPsIQbU9ChzVBNLpRnEwitMLYWors0Sy8wknERwPPuixAXakaHBw18Jm+ofwItzbg=="
 		},
 		"arr-flatten": {
 			"version": "1.1.0",
@@ -279,12 +279,12 @@
 			"integrity": "sha512-NCrCHhWmnQklfH4MtJMRjZ2a8c80qXeMlQMv2uVp9ISJMTt562SbGd6n2oq0PaPgKm7Z6pL9E2UlLIhC+SHL3w=="
 		},
 		"proj4": {
-			"version": "2.6.0",
-			"resolved": "https://registry.npmjs.org/proj4/-/proj4-2.6.0.tgz",
-			"integrity": "sha512-ll2WyehUFOyzEZtN8hAiOTmZpuDCN5V+4A/HjhPbhlwVwlsFKnIHSZ3l3uhzgDndHjoL2MyERFGe9VmXN4rYUg==",
+			"version": "2.6.1",
+			"resolved": "https://registry.npmjs.org/proj4/-/proj4-2.6.1.tgz",
+			"integrity": "sha512-RP5EcrfrLcARy+Zjjz1wIeqZzZdPtQNl685asHcwdU/MQ/dvydmf1XWM4mgok6wPaNsXZ8IFrM4qadO3g46PiQ==",
 			"requires": {
 				"mgrs": "1.0.0",
-				"wkt-parser": "^1.2.0"
+				"wkt-parser": "^1.2.4"
 			}
 		},
 		"pxls": {
@@ -338,10 +338,11 @@
 			}
 		},
 		"terrain50": {
-			"version": "1.3.0",
-			"resolved": "https://registry.npmjs.org/terrain50/-/terrain50-1.3.0.tgz",
-			"integrity": "sha512-BkQMAY6W67FsE1yWr24yHBhd46lQCdwON1/pMkZsLTWl1EYiaSPCNu+QCO4GV/7E8b9IXgiPUQpOqtiA5sZ6BQ==",
+			"version": "1.4.0",
+			"resolved": "https://registry.npmjs.org/terrain50/-/terrain50-1.4.0.tgz",
+			"integrity": "sha512-N+2Im3s4LUhB5Atrsk7TKuJ7ty6maL3dz/jb+jAF48X4yK/YY6Fi4GSaCp2xx2+9F9YBMrzeJA6iDzQpMDr91A==",
 			"requires": {
+				"nexline": "^1.2.0",
 				"nnng": "^1.0.0"
 			}
 		},
diff --git a/package.json b/package.json
index 8d6d222..3209850 100644
--- a/package.json
+++ b/package.json
@@ -32,12 +32,12 @@
 	],
 	"homepage": "https://github.com/sbrl/terrain50-cli#readme",
 	"dependencies": {
-		"@iarna/toml": "^2.2.3",
-		"applause-cli": "^1.2.0",
+		"@iarna/toml": "^2.2.5",
+		"applause-cli": "^1.2.2",
 		"chroma-js": "^2.1.0",
 		"image-encode": "^1.3.0",
 		"nexline": "^1.2.0",
-		"terrain50": "^1.3.0"
+		"terrain50": "^1.4.0"
 	},
 	"bin": {
 		"terrain50": "./src/index.mjs"
diff --git a/src/Subcommands/validator/index.mjs b/src/Subcommands/validator/index.mjs
index 6ce099a..6634570 100644
--- a/src/Subcommands/validator/index.mjs
+++ b/src/Subcommands/validator/index.mjs
@@ -5,12 +5,38 @@ import fs from 'fs';
 import a from '../../Helpers/Ansi.mjs';
 import Terrain50 from 'terrain50';
 
-export default async function(_settings) {
-	// Read stdin into a string - ref https://stackoverflow.com/a/56012724/1460422
-	let source = fs.readFileSync(0, 'utf-8');
-	
-	let errors = Terrain50.Validate(source);
-	
+export default async function(settings) {
+	switch(settings.cli.mode) {
+		case "validate":
+			// Read stdin into a string - ref https://stackoverflow.com/a/56012724/1460422
+			let source = fs.readFileSync(0, 'utf-8');
+			
+			let errors = Terrain50.Validate(source);
+			display_errors(errors);
+			break;
+		
+		case "stream":
+			let i = 0;
+			for await (let next of Terrain50.ParseStream(process.stdin)) {
+				console.log(`>>> Item ${i} <<<`);
+				display_errors(next.validate());
+				i++;
+			}
+			break;
+		
+		default:
+			console.error(`${a.fred}${a.hicol}Error: Mode '${settings.cli.mode}' was not recognised. Possible modes: validate (the default), stream.${a.reset}`);
+			process.exit(1);
+	}
+}
+
+/**
+ * Displays the errors returned by a Terrain50 validation function.
+ * (e.g. `Terrain50.Validate(str)`, or `obj.validate()`)
+ * @param  {[type]} errors [description]
+ * @return {[type]}        [description]
+ */
+function display_errors(errors) {
 	if(errors.length > 0) {
 		for(let error of errors) {
 			switch(error.level) {
@@ -30,5 +56,4 @@ export default async function(_settings) {
 	else {
 		console.log(`${a.fgreen}Validation completed successfully - no issues detected :D${a.reset}`);
 	}
-	
 }
diff --git a/src/Subcommands/validator/meta.toml b/src/Subcommands/validator/meta.toml
index 6260cc3..a85f6d9 100644
--- a/src/Subcommands/validator/meta.toml
+++ b/src/Subcommands/validator/meta.toml
@@ -1 +1,7 @@
 description = "Read the Terrain50 file on stdin, validate it, and display any errors found"
+
+[[arguments]]
+name = "mode"
+description = "The mode to operate in. Possible values: validate (default), stream. If stream, then validation will be done on individual items after parsing (otherwise validation is done during parsing, which catches more errors)"
+default_value = "validate"
+type = "string"