diff --git a/config.json b/config.json
index 850b677699..3f4ad36bfb 100644
--- a/config.json
+++ b/config.json
@@ -528,6 +528,20 @@
           "time"
         ]
       },
+      {
+        "slug": "line-up",
+        "name": "Line Up",
+        "uuid": "034b31ef-331a-419d-bb62-465c05b533d8",
+        "practices": [
+          "numbers",
+          "strings"
+        ],
+        "prerequisites": [
+          "numbers",
+          "strings"
+        ],
+        "difficulty": 1
+      },
       {
         "slug": "rna-transcription",
         "name": "RNA Transcription",
diff --git a/exercises/practice/line-up/.docs/instructions.md b/exercises/practice/line-up/.docs/instructions.md
new file mode 100644
index 0000000000..9e686ecbff
--- /dev/null
+++ b/exercises/practice/line-up/.docs/instructions.md
@@ -0,0 +1,19 @@
+# Instructions
+
+Given a name and a number, your task is to produce a sentence using that name and that number as an [ordinal numeral][ordinal-numeral].
+Yaʻqūb expects to use numbers from 1 up to 999.
+
+Rules:
+
+- Numbers ending in 1 (unless ending in 11) → `"st"`
+- Numbers ending in 2 (unless ending in 12) → `"nd"`
+- Numbers ending in 3 (unless ending in 13) → `"rd"`
+- All other numbers → `"th"`
+
+Examples:
+
+- `"Mary", 1` → `"Mary, you are the 1st customer we serve today. Thank you!"`
+- `"John", 12` → `"John, you are the 12th customer we serve today. Thank you!"`
+- `"Dahir", 162` → `"Dahir, you are the 162nd customer we serve today. Thank you!"`
+
+[ordinal-numeral]: https://en.wikipedia.org/wiki/Ordinal_numeral
diff --git a/exercises/practice/line-up/.docs/introduction.md b/exercises/practice/line-up/.docs/introduction.md
new file mode 100644
index 0000000000..ea07268ae3
--- /dev/null
+++ b/exercises/practice/line-up/.docs/introduction.md
@@ -0,0 +1,7 @@
+# Introduction
+
+Your friend Yaʻqūb works the counter at a deli in town, slicing, weighing, and wrapping orders for a line of hungry customers that gets longer every day.
+Waiting customers are starting to lose track of who is next, so he wants numbered tickets they can use to track the order in which they arrive.
+
+To make the customers feel special, he does not want the ticket to have only a number on it.
+They shall get a proper English sentence with their name and number on it.
diff --git a/exercises/practice/line-up/.gitignore b/exercises/practice/line-up/.gitignore
new file mode 100644
index 0000000000..0c88ff6ec3
--- /dev/null
+++ b/exercises/practice/line-up/.gitignore
@@ -0,0 +1,5 @@
+/node_modules
+/bin/configlet
+/bin/configlet.exe
+/package-lock.json
+/yarn.lock
diff --git a/exercises/practice/line-up/.meta/config.json b/exercises/practice/line-up/.meta/config.json
new file mode 100644
index 0000000000..b555adb6e6
--- /dev/null
+++ b/exercises/practice/line-up/.meta/config.json
@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "line-up.js"
+    ],
+    "test": [
+      "line-up.spec.js"
+    ],
+    "example": [
+      ".meta/proof.ci.js"
+    ]
+  },
+  "blurb": "Help lining up customers at Yaʻqūb's Deli.",
+  "source": "mk-mxp, based on previous work from Exercism contributors codedge and neenjaw",
+  "source_url": "https://forum.exercism.org/t/new-exercise-ordinal-numbers/19147"
+}
diff --git a/exercises/practice/line-up/.meta/proof.ci.js b/exercises/practice/line-up/.meta/proof.ci.js
new file mode 100644
index 0000000000..64ba5c1919
--- /dev/null
+++ b/exercises/practice/line-up/.meta/proof.ci.js
@@ -0,0 +1,25 @@
+const getSuffix = (number) => {
+  const lastTwoDigits = number % 100;
+  const lastDigit = number % 10;
+
+  if (lastTwoDigits >= 11 && lastTwoDigits <= 13) {
+    return 'th';
+  }
+
+  if (lastDigit === 1) {
+    return 'st';
+  }
+
+  if (lastDigit === 2) {
+    return 'nd';
+  }
+
+  if (lastDigit === 3) {
+    return 'rd';
+  }
+
+  return 'th';
+};
+
+export const format = (name, number) =>
+  `${name}, you are the ${number}${getSuffix(number)} customer we serve today. Thank you!`;
diff --git a/exercises/practice/line-up/.meta/tests.toml b/exercises/practice/line-up/.meta/tests.toml
new file mode 100644
index 0000000000..36fdf1d0cd
--- /dev/null
+++ b/exercises/practice/line-up/.meta/tests.toml
@@ -0,0 +1,67 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[7760d1b8-4864-4db4-953b-0fa7c047dbc0]
+description = "format smallest non-exceptional ordinal numeral 4"
+
+[e8b7c715-6baa-4f7b-8fb3-2fa48044ab7a]
+description = "format greatest single digit non-exceptional ordinal numeral 9"
+
+[f370aae9-7ae7-4247-90ce-e8ff8c6934df]
+description = "format non-exceptional ordinal numeral 5"
+
+[37f10dea-42a2-49de-bb92-0b690b677908]
+description = "format non-exceptional ordinal numeral 6"
+
+[d8dfb9a2-3a1f-4fee-9dae-01af3600054e]
+description = "format non-exceptional ordinal numeral 7"
+
+[505ec372-1803-42b1-9377-6934890fd055]
+description = "format non-exceptional ordinal numeral 8"
+
+[8267072d-be1f-4f70-b34a-76b7557a47b9]
+description = "format exceptional ordinal numeral 1"
+
+[4d8753cb-0364-4b29-84b8-4374a4fa2e3f]
+description = "format exceptional ordinal numeral 2"
+
+[8d44c223-3a7e-4f48-a0ca-78e67bf98aa7]
+description = "format exceptional ordinal numeral 3"
+
+[6c4f6c88-b306-4f40-bc78-97cdd583c21a]
+description = "format smallest two digit non-exceptional ordinal numeral 10"
+
+[e257a43f-d2b1-457a-97df-25f0923fc62a]
+description = "format non-exceptional ordinal numeral 11"
+
+[bb1db695-4d64-457f-81b8-4f5a2107e3f4]
+description = "format non-exceptional ordinal numeral 12"
+
+[60a3187c-9403-4835-97de-4f10ebfd63e2]
+description = "format non-exceptional ordinal numeral 13"
+
+[2bdcebc5-c029-4874-b6cc-e9bec80d603a]
+description = "format exceptional ordinal numeral 21"
+
+[74ee2317-0295-49d2-baf0-d56bcefa14e3]
+description = "format exceptional ordinal numeral 62"
+
+[b37c332d-7f68-40e3-8503-e43cbd67a0c4]
+description = "format exceptional ordinal numeral 100"
+
+[0375f250-ce92-4195-9555-00e28ccc4d99]
+description = "format exceptional ordinal numeral 101"
+
+[0d8a4974-9a8a-45a4-aca7-a9fb473c9836]
+description = "format non-exceptional ordinal numeral 112"
+
+[06b62efe-199e-4ce7-970d-4bf73945713f]
+description = "format exceptional ordinal numeral 123"
diff --git a/exercises/practice/line-up/.npmrc b/exercises/practice/line-up/.npmrc
new file mode 100644
index 0000000000..d26df800bb
--- /dev/null
+++ b/exercises/practice/line-up/.npmrc
@@ -0,0 +1 @@
+audit=false
diff --git a/exercises/practice/line-up/LICENSE b/exercises/practice/line-up/LICENSE
new file mode 100644
index 0000000000..90e73be03b
--- /dev/null
+++ b/exercises/practice/line-up/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 Exercism
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/exercises/practice/line-up/babel.config.js b/exercises/practice/line-up/babel.config.js
new file mode 100644
index 0000000000..a638497df1
--- /dev/null
+++ b/exercises/practice/line-up/babel.config.js
@@ -0,0 +1,4 @@
+module.exports = {
+  presets: [['@exercism/babel-preset-javascript', { corejs: '3.40' }]],
+  plugins: [],
+};
diff --git a/exercises/practice/line-up/eslint.config.mjs b/exercises/practice/line-up/eslint.config.mjs
new file mode 100644
index 0000000000..ca517111ed
--- /dev/null
+++ b/exercises/practice/line-up/eslint.config.mjs
@@ -0,0 +1,45 @@
+// @ts-check
+
+import config from '@exercism/eslint-config-javascript';
+import maintainersConfig from '@exercism/eslint-config-javascript/maintainers.mjs';
+
+import globals from 'globals';
+
+export default [
+  ...config,
+  ...maintainersConfig,
+  {
+    files: maintainersConfig[1].files,
+    rules: {
+      'jest/expect-expect': ['warn', { assertFunctionNames: ['expect*'] }],
+    },
+  },
+  {
+    files: ['scripts/**/*.mjs'],
+    languageOptions: {
+      globals: {
+        ...globals.node,
+      },
+    },
+  },
+  // <<inject-rules-here>>
+  {
+    ignores: [
+      // # Protected or generated
+      '/.appends/**/*',
+      '/.github/**/*',
+      '/.vscode/**/*',
+
+      // # Binaries
+      '/bin/*',
+
+      // # Configuration
+      '/config',
+      '/babel.config.js',
+
+      // # Typings
+      '/exercises/**/global.d.ts',
+      '/exercises/**/env.d.ts',
+    ],
+  },
+];
diff --git a/exercises/practice/line-up/jest.config.js b/exercises/practice/line-up/jest.config.js
new file mode 100644
index 0000000000..ec8e908127
--- /dev/null
+++ b/exercises/practice/line-up/jest.config.js
@@ -0,0 +1,22 @@
+module.exports = {
+  verbose: true,
+  projects: ['<rootDir>'],
+  testMatch: [
+    '**/__tests__/**/*.[jt]s?(x)',
+    '**/test/**/*.[jt]s?(x)',
+    '**/?(*.)+(spec|test).[jt]s?(x)',
+  ],
+  testPathIgnorePatterns: [
+    '/(?:production_)?node_modules/',
+    '.d.ts$',
+    '<rootDir>/test/fixtures',
+    '<rootDir>/test/helpers',
+    '__mocks__',
+  ],
+  transform: {
+    '^.+\\.[jt]sx?$': 'babel-jest',
+  },
+  moduleNameMapper: {
+    '^(\\.\\/.+)\\.js$': '$1',
+  },
+};
diff --git a/exercises/practice/line-up/line-up.js b/exercises/practice/line-up/line-up.js
new file mode 100644
index 0000000000..d052cd5eb9
--- /dev/null
+++ b/exercises/practice/line-up/line-up.js
@@ -0,0 +1,8 @@
+//
+// This is only a SKELETON file for the 'Line Up' exercise. It's been provided as a
+// convenience to get you started writing code faster.
+//
+
+export const format = () => {
+  throw new Error('Remove this line and implement the function');
+};
diff --git a/exercises/practice/line-up/line-up.spec.js b/exercises/practice/line-up/line-up.spec.js
new file mode 100644
index 0000000000..62877284de
--- /dev/null
+++ b/exercises/practice/line-up/line-up.spec.js
@@ -0,0 +1,118 @@
+import { describe, expect, test, xtest } from '@jest/globals';
+import { format } from './line-up';
+
+describe('Line Up', () => {
+  test('format smallest non-exceptional ordinal numeral 4', () => {
+    expect(format('Gianna', 4)).toBe(
+      'Gianna, you are the 4th customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format greatest single digit non-exceptional ordinal numeral 9', () => {
+    expect(format('Maarten', 9)).toBe(
+      'Maarten, you are the 9th customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format non-exceptional ordinal numeral 5', () => {
+    expect(format('Petronila', 5)).toBe(
+      'Petronila, you are the 5th customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format non-exceptional ordinal numeral 6', () => {
+    expect(format('Attakullakulla', 6)).toBe(
+      'Attakullakulla, you are the 6th customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format non-exceptional ordinal numeral 7', () => {
+    expect(format('Kate', 7)).toBe(
+      'Kate, you are the 7th customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format non-exceptional ordinal numeral 8', () => {
+    expect(format('Maximiliano', 8)).toBe(
+      'Maximiliano, you are the 8th customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format exceptional ordinal numeral 1', () => {
+    expect(format('Mary', 1)).toBe(
+      'Mary, you are the 1st customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format exceptional ordinal numeral 2', () => {
+    expect(format('Haruto', 2)).toBe(
+      'Haruto, you are the 2nd customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format exceptional ordinal numeral 3', () => {
+    expect(format('Henriette', 3)).toBe(
+      'Henriette, you are the 3rd customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format smallest two digit non-exceptional ordinal numeral 10', () => {
+    expect(format('Alvarez', 10)).toBe(
+      'Alvarez, you are the 10th customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format non-exceptional ordinal numeral 11', () => {
+    expect(format('Jacqueline', 11)).toBe(
+      'Jacqueline, you are the 11th customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format non-exceptional ordinal numeral 12', () => {
+    expect(format('Juan', 12)).toBe(
+      'Juan, you are the 12th customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format non-exceptional ordinal numeral 13', () => {
+    expect(format('Patricia', 13)).toBe(
+      'Patricia, you are the 13th customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format exceptional ordinal numeral 21', () => {
+    expect(format('Washi', 21)).toBe(
+      'Washi, you are the 21st customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format exceptional ordinal numeral 62', () => {
+    expect(format('Nayra', 62)).toBe(
+      'Nayra, you are the 62nd customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format exceptional ordinal numeral 100', () => {
+    expect(format('John', 100)).toBe(
+      'John, you are the 100th customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format exceptional ordinal numeral 101', () => {
+    expect(format('Zeinab', 101)).toBe(
+      'Zeinab, you are the 101st customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format exceptional ordinal numeral 112', () => {
+    expect(format('Knud', 112)).toBe(
+      'Knud, you are the 112th customer we serve today. Thank you!',
+    );
+  });
+
+  xtest('format exceptional ordinal numeral 123', () => {
+    expect(format('Yma', 123)).toBe(
+      'Yma, you are the 123rd customer we serve today. Thank you!',
+    );
+  });
+});
diff --git a/exercises/practice/line-up/package.json b/exercises/practice/line-up/package.json
new file mode 100644
index 0000000000..2d55c3710b
--- /dev/null
+++ b/exercises/practice/line-up/package.json
@@ -0,0 +1,34 @@
+{
+  "name": "@exercism/javascript-line-up",
+  "description": "Exercism exercises in Javascript.",
+  "author": "Katrina Owen",
+  "private": true,
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/exercism/javascript",
+    "directory": "exercises/practice/line-up"
+  },
+  "devDependencies": {
+    "@exercism/babel-preset-javascript": "^0.5.1",
+    "@exercism/eslint-config-javascript": "^0.8.1",
+    "@jest/globals": "^29.7.0",
+    "@types/node": "^24.3.0",
+    "@types/shelljs": "^0.8.17",
+    "babel-jest": "^29.7.0",
+    "core-js": "~3.42.0",
+    "diff": "^8.0.2",
+    "eslint": "^9.28.0",
+    "expect": "^29.7.0",
+    "globals": "^16.3.0",
+    "jest": "^29.7.0"
+  },
+  "dependencies": {},
+  "scripts": {
+    "lint": "corepack pnpm eslint .",
+    "test": "corepack pnpm jest",
+    "watch": "corepack pnpm jest --watch",
+    "format": "corepack pnpm prettier -w ."
+  },
+  "packageManager": "pnpm@9.15.2"
+}