The 23-year-old's previous contract at Gresty Road was due to expire at the end of the season.
Davis made his first-team debut in 2010 after coming through the club's youth system.
Crewe are currently in 20th place in the League One table, two points above the relegation zone.
They return to league action on Saturday with the visit of MK Dons.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Walsall | 23 | 16 | 4 | 3 | 43 | 20 | 23 | 52 |
| 2 | Crewe AlexandraCrewe | 24 | 11 | 9 | 4 | 33 | 22 | 11 | 42 |
| 3 | Salford City | 24 | 12 | 6 | 6 | 29 | 19 | 10 | 42 |
| 4 | Port Vale | 25 | 11 | 8 | 6 | 29 | 25 | 4 | 41 |
| 5 | AFC Wimbledon | 23 | 12 | 4 | 7 | 35 | 19 | 16 | 40 |
| 6 | Notts County | 24 | 11 | 7 | 6 | 38 | 26 | 12 | 40 |
| 7 | Doncaster RoversDoncaster | 25 | 11 | 7 | 7 | 35 | 30 | 5 | 40 |
| 8 | Bradford CityBradford | 24 | 10 | 8 | 6 | 33 | 27 | 6 | 38 |
| 9 | Grimsby Town | 25 | 12 | 1 | 12 | 36 | 40 | -4 | 37 |
| 10 | Chesterfield | 24 | 9 | 7 | 8 | 38 | 29 | 9 | 34 |
| 11 | MK Dons | 23 | 10 | 4 | 9 | 36 | 31 | 5 | 34 |
| 12 | Bromley | 24 | 8 | 10 | 6 | 35 | 30 | 5 | 34 |
| 13 | Cheltenham TownCheltenham | 24 | 8 | 7 | 9 | 34 | 36 | -2 | 31 |
| 14 | Gillingham | 23 | 9 | 3 | 11 | 22 | 24 | -2 | 30 |
| 15 | BarrowBarrow | 24 | 7 | 7 | 10 | 23 | 26 | -3 | 28 |
| 16 | Fleetwood TownFleetwood | 22 | 6 | 9 | 7 | 28 | 28 | 0 | 27 |
| 17 | Colchester UnitedColchester | 24 | 5 | 12 | 7 | 28 | 28 | 0 | 27 |
| 18 | Newport CountyNewport | 23 | 7 | 5 | 11 | 30 | 40 | -10 | 26 |
| 19 | Accrington StanleyAccrington | 23 | 6 | 7 | 10 | 32 | 40 | -8 | 25 |
| 20 | Tranmere RoversTranmere | 23 | 6 | 7 | 10 | 17 | 32 | -15 | 25 |
| 21 | Harrogate TownHarrogate | 25 | 7 | 4 | 14 | 21 | 37 | -16 | 25 |
| 22 | Swindon TownSwindon | 25 | 5 | 9 | 11 | 31 | 41 | -10 | 24 |
| 23 | Morecambe | 24 | 5 | 5 | 14 | 22 | 39 | -17 | 20 |
| 24 | Carlisle UnitedCarlisle | 24 | 4 | 6 | 14 | 19 | 38 | -19 | 18 |
| > League Two Full Table | |||||||||
