do i need a swaziland visa before going there with my ghanaian passport?

Very Oldman

The best answer will come from the Swaziland embassy. I can tell you that a couple years ago, before I retired, I worked at a university and traveled with a co-worker to Zambia for a conference on indigenous peoples rights. He is from Zaire, the university travel authorization office contacted both the Zambia and Zaire authorities who assured us he need no Zambian visa to travel with his Zaire passport. By the time we got there, the rules had apparently changed. I enjoyed the conference while he sat in the airport security office for 3 days until the paperwork worked its was through the red-tape. By the time he was allowed to leave the airport, the conference was over.

firmbeliever

Swaziland Visa Services for citizens of Ghana - Visas to Swaziland Online: Application, Requirements
Citizens of the following countries DO NOT require a Swaziland visa for a stay of up to 60 days: Anguilla, Australia, Bahamas, Barbados, Belgium, Bermuda, Botswana, British Virgin Islands, Canada, Cayman Islands, Cyprus, Denmark, Falkland Islands, Finland, Gambia, Ghana, Gibraltar, Greece, Grenada, Guyana, Iceland, Malawi, Malta, Mauritius, Montserrat, Mozambique, Nauru, Netherlands, New Zealand, Norway, Papua New Guinea, Pitcairn Islands, Portugal, Saint Helena, Samoa, San Marino, Seychelles, Sierra Leone, South Africa, Sweden, Tanzania, Tonga, Trinidad Tobago, Uganda, Uruguay, United States, Zambia, Zimbabwe.
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There is a downloadable visa form available on the above link.
Hope this helps.