Available parameters and response documentation is available here

GET /lookup/gene/BRAF/hg19?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Cache-Control: max-age=300
Content-Type: application/json ;utf-8
ETag: "8f4c4f004cbfc558781197627f18aa9bff77d5425c51f92c7b519a77a0fad4fd"
Vary: Accept

{
  "gene_id": 2273,
  "symbol": "BRAF",
  "description": "B-Raf proto-oncogene, serine/threonine kinase",
  "synonyms": [
    "BRAF-1",
    "BRAF1"
  ],
  "publications": {
    "publications": [],
    "genes": []
  },
  "identifiers": {
    "hgnc_id": [
      "1097"
    ],
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      "H7C4S5",
      "H7C560",
      "H7C5K3",
      "P15056"
    ],
    "ensembl_id": [
      "ENSG00000157764"
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    "entrez_id": [
      "673"
    ],
    "lrg_id": [
      "LRG_299"
    ]
  },
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    {
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    },
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}