Currently it takes a clan tag to the CLI, it then searches for all clans with the same location and with at least the same clan level, and returns a ranking of them by war wins.
NOTE: Because SuperCell haven't enabled paging in their API yet, the results aren't accurate, but it shows an example of how to use the API and the kind of things that will be possible.
mat@aurora:~/code/clashofclans$ node_modules/.bin/babel-node cli.js "#90JJLUCQ"
Clans in United Kingdom, minimum clan level 8
==========================================
1. uk united [9] - 238
2. ENGLISH ARMY♚ [9] - 231
3. Black Widowz [9] - 224
4. Baller Baller [8] - 222
5. MUFC [9] - 217
6. Mdl forever [8] - 216
7. clanage [8] - 216
8. Trigger Happy [8] - 215
9. Bang Bus [9] - 214
10. ADULT ! A [9] - 210
11. cN.UK [8] - 207
12. FDC [8] - 206
13. braver warriors [8] - 204
14. Miller Time [8] - 204
15. GivMeDemCookies [9] - 203
16. #Waraways [9] - 203
17. Mental Scots [9] - 198
18. PERMIRIFICUS I [8] - 196
19. Sheldon Massive [9] - 195
20. Back of the net [9] - 193
21. hunters [8] - 189
22. Atomic Jocks [8] - 187
23. Dorset COC [8] - 187
24. hulkz [8] - 186
25. 1 cannon magic [9] - 186
26. Pinoy Ninja [8] - 185
27. BIG O'S SMASH [8] - 185
28. Scotland [9] - 184
29. Inferno Kings [9] - 183
30. BiffBangPow [8] - 181
31. Ulster [9] - 181
32. clannabis smoke [8] - 181
33. 6Inches Of Fury [8] - 180
34. The K Bombs [8] - 180
35. Cymru -WalesWar [8] - 179
36. 17 Dragons [10] - 179
37. Bolt!!! [8] - 178
38. bsvn war [8] - 178
39. Phil.Bully.Gang [9] - 178
40. VERY HARD [8] - 177
41. RedDevilLegends [8] - 177
42. **STOKE_UK_VN** [8] - 175
43. army of brits [8] - 174
44. AxsWarriors [9] - 174
45. INDIAN HUNK 2 [8] - 173
46. Dynamite chaos [8] - 172
47. 蓝灵会 [8] - 172
48. BALLERS92 [8] - 171
49. mini armageddon [9] - 171
50. YORKSHIRE PUDS [8] - 171
51. rawganics [8] - 171
52. Chicky [8] - 170
53. Hell Blazers [8] - 170
54. WATP [8] - 170
55. Spartan Glory! [8] - 169
56. DrySpoon [8] - 169
57. Super Soldiers [8] - 168
58. RAGING PHOENIX [9] - 168
59. Monkeyface [9] - 168
60. Immortal Force [8] - 167
61. House Moorego [8] - 167
62. Shaolin Killers [8] - 167
63. Pogba Dogs [8] - 166
64. LONDON X50 [9] - 165
65. sheffield 2013 [8] - 164
66. OutOfTheAshes [8] - 162
67. tiny terrorists [10] - 162
68. uk vietnamese [8] - 162
69. DAMN.I♥MDO™ [8] - 161
70. Yellow & Violet [8] - 161
71. The Rebellion [8] - 160
72. The Anunnaki'sΔ [8] - 160
73. ↗️Kiss Of Death [9] - 160
74. Venum Elite [8] - 159
75. 50Clan-Warriors [8] - 159
76. bruvas of kaos [8] - 159
77. Ab'Salute'War [8] - 159
78. Zoo Bombers [8] - 158
79. jacobs clan [8] - 158
80. notnowkids [9] - 158
81. Slappa Da Bass [8] - 158
82. kAlde[r]0 [8] - 157
83. london [8] - 157
84. #Invincibles# [8] - 157
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