safeDecodeURIComponent

1/**
2 * Safely decodes a URI component with a fallback on failure.
3 *
4 * @param str - The input string to decode.
5 * @param fallback - Optional fallback value if decoding fails.
6 * @returns Decoded string or fallback.
7 */
8export function safeDecodeURIComponent(str: string, fallback = ''): string {
9  try {
10    return decodeURIComponent(str);
11  } catch {
12    return fallback;
13  }
14}

1test('safeDecodeURIComponent - decodes standard encoded string', () => {
2  expect(safeDecodeURIComponent('hello%20world')).toBe('hello world');
3});
4
5test('safeDecodeURIComponent - decodes special characters', () => {
6  expect(safeDecodeURIComponent('a%2Bb%3Dc%26d')).toBe('a+b=c&d');
7});
8
9test('safeDecodeURIComponent - decodes unicode characters', () => {
10  expect(safeDecodeURIComponent('%D0%9F%D1%80%D0%B8%D0%B2%D0%B5%D1%82')).toBe('Привет');
11});
12
13test('safeDecodeURIComponent - returns fallback on malformed input', () => {
14  expect(safeDecodeURIComponent('%E0%A4%A', 'fallback')).toBe('fallback');
15});
16
17test('safeDecodeURIComponent - empty string returns empty string', () => {
18  expect(safeDecodeURIComponent('')).toBe('');
19});