diff --git a/lib/assign.js b/lib/assign.js
index f9ee6b2..5e230fc 100644
--- a/lib/assign.js
+++ b/lib/assign.js
@@ -24,7 +24,7 @@ var isNonNegativeIntegerArray = require( '@stdlib/assert-is-nonnegative-integer-
 var isInteger = require( '@stdlib/assert-is-integer' ).isPrimitive;
 var shape2strides = require( '@stdlib/ndarray-base-shape2strides' );
 var getSubscripts = require( '@stdlib/ndarray-base-ind2sub' ).assign;
-var format = require( '@stdlib/string-format' );
+var format = require( '@stdlib/error-tools-fmtprodmsg' );
 var defaults = require( './defaults.json' );
 var validate = require( './validate.js' );
 
@@ -81,20 +81,20 @@ function ind2sub( shape, idx, options, out ) {
 			throw err;
 		}
 		if ( typeof out !== 'object' || out === null ) {
-			throw new TypeError( format( 'invalid argument. Output argument must be either an array, typed array, or object. Value: `%s`.', out ) );
+			throw new TypeError( format( '0jx5j', out ) );
 		}
 		dest = out;
 	} else {
 		dest = options;
 		if ( typeof dest !== 'object' || dest === null ) {
-			throw new TypeError( format( 'invalid argument. Output argument must be either an array, typed array, or object. Value: `%s`.', dest ) );
+			throw new TypeError( format( '0jx5j', dest ) );
 		}
 	}
 	if ( !isNonNegativeIntegerArray( shape ) ) {
-		throw new TypeError( format( 'invalid argument. Shape argument must be an array-like object containing nonnegative integers. Value: `%s`.', shape ) );
+		throw new TypeError( format( '0jx5k', shape ) );
 	}
 	if ( !isInteger( idx ) ) {
-		throw new TypeError( format( 'invalid argument. Linear index must be integer valued. Value: `%s`.', idx ) );
+		throw new TypeError( format( '0jx5l', idx ) );
 	}
 	// Note: strides are positive, so offset is always zero
 	return getSubscripts( shape, shape2strides( shape, opts.order ), 0, opts.order, idx, opts.mode, dest ); // eslint-disable-line max-len
diff --git a/lib/main.js b/lib/main.js
index 58fdf93..697ffa9 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -24,7 +24,7 @@ var isNonNegativeIntegerArray = require( '@stdlib/assert-is-nonnegative-integer-
 var isInteger = require( '@stdlib/assert-is-integer' ).isPrimitive;
 var shape2strides = require( '@stdlib/ndarray-base-shape2strides' );
 var getSubscripts = require( '@stdlib/ndarray-base-ind2sub' );
-var format = require( '@stdlib/string-format' );
+var format = require( '@stdlib/error-tools-fmtprodmsg' );
 var defaults = require( './defaults.json' );
 var validate = require( './validate.js' );
 
@@ -73,10 +73,10 @@ function ind2sub( shape, idx, options ) {
 		}
 	}
 	if ( !isNonNegativeIntegerArray( shape ) ) {
-		throw new TypeError( format( 'invalid argument. Shape argument must be an array-like object containing nonnegative integers. Value: `%s`.', shape ) );
+		throw new TypeError( format( '0jx5k', shape ) );
 	}
 	if ( !isInteger( idx ) ) {
-		throw new TypeError( format( 'invalid argument. Linear index must be integer valued. Value: `%s`.', idx ) );
+		throw new TypeError( format( '0jx5l', idx ) );
 	}
 	// Note: strides are positive, so offset is always zero
 	return getSubscripts( shape, shape2strides( shape, opts.order ), 0, opts.order, idx, opts.mode ); // eslint-disable-line max-len
diff --git a/lib/validate.js b/lib/validate.js
index ee01d90..2413b4f 100644
--- a/lib/validate.js
+++ b/lib/validate.js
@@ -24,7 +24,7 @@ var isObject = require( '@stdlib/assert-is-plain-object' );
 var hasOwnProp = require( '@stdlib/assert-has-own-property' );
 var isOrder = require( '@stdlib/ndarray-base-assert-is-order' );
 var isIndexMode = require( '@stdlib/ndarray-base-assert-is-index-mode' );
-var format = require( '@stdlib/string-format' );
+var format = require( '@stdlib/error-tools-fmtprodmsg' );
 
 
 // MAIN //
@@ -52,18 +52,18 @@ var format = require( '@stdlib/string-format' );
 */
 function validate( opts, options ) {
 	if ( !isObject( options ) ) {
-		return new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
+		return new TypeError( format( '0jx2V', options ) );
 	}
 	if ( hasOwnProp( options, 'mode' ) ) {
 		opts.mode = options.mode;
 		if ( !isIndexMode( opts.mode ) ) {
-			return new TypeError( format( 'invalid option. `%s` option must be a supported/recognized mode. Option: `%s`.', 'mode', opts.mode ) );
+			return new TypeError( format( '0jx5m', 'mode', opts.mode ) );
 		}
 	}
 	if ( hasOwnProp( options, 'order' ) ) {
 		opts.order = options.order;
 		if ( !isOrder( opts.order ) ) {
-			return new TypeError( format( 'invalid option. `%s` option must be a supported/recognized order. Option: `%s`.', 'order', opts.order ) );
+			return new TypeError( format( '0jx5n', 'order', opts.order ) );
 		}
 	}
 	return null;
diff --git a/package.json b/package.json
index 1cf74ee..75cb997 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
     "@stdlib/ndarray-base-assert-is-order": "^0.2.2",
     "@stdlib/ndarray-base-ind2sub": "^0.2.3",
     "@stdlib/ndarray-base-shape2strides": "^0.2.3",
-    "@stdlib/string-format": "^0.2.3",
+    "@stdlib/error-tools-fmtprodmsg": "^0.2.3",
     "@stdlib/types": "^0.4.3",
     "@stdlib/utils-define-nonenumerable-read-only-property": "^0.2.3",
     "@stdlib/error-tools-fmtprodmsg": "^0.2.3"