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Use the select parameter to return only specific fields: 
https://api.openalex.org/works?select=id,doi,display_name
Response: 
{
  "results": [
    {
      "id": "https://openalex.org/W1775749144",
      "doi": "https://doi.org/10.1016/s0021-9258(19)52451-6",
      "display_name": "PROTEIN MEASUREMENT WITH THE FOLIN PHENOL REAGENT"
    },
    {
      "id": "https://openalex.org/W2100837269",
      "doi": "https://doi.org/10.1038/227680a0",
      "display_name": "Cleavage of Structural Proteins during the Assembly of the Head of Bacteriophage T4"
    }
  ]
}

​
Limitations

Root-level fields only. You can select top-level fields but not nested properties: 
// Given this structure:
{
  "id": "https://openalex.org/W2138270253",
  "open_access": {
    "is_oa": true,
    "oa_status": "bronze",
    "oa_url": "http://www.pnas.org/content/74/12/5463.full.pdf"
  }
}
QueryWorks?
select=id,open_accessYes
select=open_access.is_oaNo (error)

​
Where select works

EndpointSupported?
List entities (/works, etc.)Yes
Single entity (/works/{id})Yes
Group byNo
AutocompleteNo