diff --git a/README.md b/README.md
index 43a70f0..1acb0d3 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,10 @@ __TODO__: insert animation of snippet usage
 
 + [Document symbol provider example](https://github.com/svaberg/SWMF-grammar/blob/master/src/extension.ts)
 
++ [pygls documentation](https://pygls.readthedocs.io/en/latest/pages/getting_started.html)
+
++ [Language Server using pygls](https://github.com/openlawlibrary/pygls/blob/master/examples/json-extension/server/server.py)
+
 ---
 
 ## License
diff --git a/package-lock.json b/package-lock.json
index 5c3513f..56885cd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -542,6 +542,7 @@
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+            "dev": true,
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@@ -578,6 +579,7 @@
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+            "dev": true,
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-            "integrity": "sha1-aN/1++YMUes3cl6p4+0xDcwed24="
+            "integrity": "sha1-aN/1++YMUes3cl6p4+0xDcwed24=",
+            "dev": true
         },
         "brace-expansion": {
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@@ -661,7 +664,8 @@
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-            "integrity": "sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI="
+            "integrity": "sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI=",
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@@ -685,6 +689,7 @@
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@@ -772,6 +777,7 @@
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@@ -785,7 +791,8 @@
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+                    "dev": true
                 }
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@@ -793,6 +800,7 @@
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@@ -826,7 +834,8 @@
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+            "dev": true
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@@ -854,6 +863,7 @@
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@@ -861,7 +871,8 @@
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-            "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU="
+            "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
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+            "dev": true
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@@ -938,7 +951,8 @@
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+            "integrity": "sha1-OjYof1A05pnnV3kBBSwubJQlFjE=",
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@@ -968,6 +982,7 @@
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@@ -1327,6 +1346,7 @@
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             "integrity": "sha1-JcfInLH5B3+IkbvmHY85Dq4lbx4=",
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@@ -1384,12 +1404,14 @@
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-            "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
+            "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
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@@ -1424,7 +1446,8 @@
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-            "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0="
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+            "dev": true
         },
         "mime-db": {
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@@ -2098,7 +2137,8 @@
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-            "integrity": "sha512-nnbWWOkoWyUsTjKrhgD0dcz22mdkSnpYqbEjIm2nhwhuxlSkpywJmBo8h0ZqJdkp73mb90SssHkN4rsRaBAfAA=="
+            "integrity": "sha512-nnbWWOkoWyUsTjKrhgD0dcz22mdkSnpYqbEjIm2nhwhuxlSkpywJmBo8h0ZqJdkp73mb90SssHkN4rsRaBAfAA==",
+            "dev": true
         },
         "nanoid": {
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@@ -2143,6 +2183,7 @@
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+            "dev": true,
             "requires": {
                 "boolbase": "^1.0.0"
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@@ -2150,12 +2191,14 @@
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+            "integrity": "sha512-jp7ikS6Sd3GxQfZJPyH3cjcbJF6GZPClgdV+EFygjFLQ5FmW/dRUnTd9PQ9k0JhoNDabWFbpF1yCdSWCC6gexg==",
+            "dev": true
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             "version": "1.4.0",
             "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
             "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+            "dev": true,
             "requires": {
                 "wrappy": "1"
             }
@@ -2186,17 +2229,20 @@
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-            "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M="
+            "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M=",
+            "dev": true
         },
         "os-tmpdir": {
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
-            "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ="
+            "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=",
+            "dev": true
         },
         "osenv": {
             "version": "0.1.5",
             "resolved": "https://registry.npmjs.org/osenv/-/osenv-0.1.5.tgz",
             "integrity": "sha512-0CWcCECdMVc2Rw3U5w9ZjqX6ga6ubk1xDVKxtBQPK7wis/0F2r9T6k4ydGYhecl7YUBxBVxhL5oisPsNxAPe2g==",
+            "dev": true,
             "requires": {
                 "os-homedir": "^1.0.0",
                 "os-tmpdir": "^1.0.0"
@@ -2206,6 +2252,7 @@
             "version": "0.2.1",
             "resolved": "https://registry.npmjs.org/ovsx/-/ovsx-0.2.1.tgz",
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+            "dev": true,
             "requires": {
                 "commander": "^6.1.0",
                 "follow-redirects": "^1.13.2",
@@ -2219,6 +2266,7 @@
                     "version": "2.4.2",
                     "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
                     "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+                    "dev": true,
                     "requires": {
                         "ansi-styles": "^3.2.1",
                         "escape-string-regexp": "^1.0.5",
@@ -2228,22 +2276,26 @@
                 "commander": {
                     "version": "6.2.1",
                     "resolved": "https://registry.npmjs.org/commander/-/commander-6.2.1.tgz",
-                    "integrity": "sha512-U7VdrJFnJgo4xjrHpTzu0yrHPGImdsmD95ZlgYSEajAn2JKzDhDTPG9kBTefmObL2w/ngeZnilk+OV9CG3d7UA=="
+                    "integrity": "sha512-U7VdrJFnJgo4xjrHpTzu0yrHPGImdsmD95ZlgYSEajAn2JKzDhDTPG9kBTefmObL2w/ngeZnilk+OV9CG3d7UA==",
+                    "dev": true
                 },
                 "escape-string-regexp": {
                     "version": "1.0.5",
                     "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-                    "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ="
+                    "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
+                    "dev": true
                 },
                 "semver": {
                     "version": "5.7.1",
                     "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
-                    "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ=="
+                    "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+                    "dev": true
                 },
                 "vsce": {
                     "version": "1.97.0",
                     "resolved": "https://registry.npmjs.org/vsce/-/vsce-1.97.0.tgz",
                     "integrity": "sha512-5Rxj6qO0dN4FnzVS9G94osstx8R3r1OQP39G7WYERpoO9X+OSodVVkRhFDapPNjekfUNo+d5Qn7W1EtNQVoLCg==",
+                    "dev": true,
                     "requires": {
                         "azure-devops-node-api": "^11.0.1",
                         "chalk": "^2.4.2",
@@ -2306,6 +2358,7 @@
             "version": "1.1.1",
             "resolved": "https://registry.npmjs.org/parse-semver/-/parse-semver-1.1.1.tgz",
             "integrity": "sha1-mkr9bfBj3Egm+T+6SpnPIj9mbLg=",
+            "dev": true,
             "requires": {
                 "semver": "^5.1.0"
             },
@@ -2313,19 +2366,22 @@
                 "semver": {
                     "version": "5.7.1",
                     "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
-                    "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ=="
+                    "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+                    "dev": true
                 }
             }
         },
         "parse5": {
             "version": "6.0.1",
             "resolved": "https://registry.npmjs.org/parse5/-/parse5-6.0.1.tgz",
-            "integrity": "sha512-Ofn/CTFzRGTTxwpNEs9PP93gXShHcTq255nzRYSKe8AkVpZY7e1fpmTfOyoIvjP5HG7Z2ZM7VS9PPhQGW2pOpw=="
+            "integrity": "sha512-Ofn/CTFzRGTTxwpNEs9PP93gXShHcTq255nzRYSKe8AkVpZY7e1fpmTfOyoIvjP5HG7Z2ZM7VS9PPhQGW2pOpw==",
+            "dev": true
         },
         "parse5-htmlparser2-tree-adapter": {
             "version": "6.0.1",
             "resolved": "https://registry.npmjs.org/parse5-htmlparser2-tree-adapter/-/parse5-htmlparser2-tree-adapter-6.0.1.tgz",
             "integrity": "sha512-qPuWvbLgvDGilKc5BoicRovlT4MtYT6JfJyBOMDsKoiT+GiuP5qyrPCnR9HcPECIJJmZh5jRndyNThnhhb/vlA==",
+            "dev": true,
             "requires": {
                 "parse5": "^6.0.1"
             }
@@ -2339,7 +2395,8 @@
         "path-is-absolute": {
             "version": "1.0.1",
             "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
-            "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18="
+            "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
+            "dev": true
         },
         "path-key": {
             "version": "3.1.1",
@@ -2362,7 +2419,8 @@
         "pend": {
             "version": "1.2.0",
             "resolved": "https://registry.npmjs.org/pend/-/pend-1.2.0.tgz",
-            "integrity": "sha1-elfrVQpng/kRUzH89GY9XI4AelA="
+            "integrity": "sha1-elfrVQpng/kRUzH89GY9XI4AelA=",
+            "dev": true
         },
         "picomatch": {
             "version": "2.3.0",
@@ -2446,6 +2504,7 @@
             "version": "6.10.1",
             "resolved": "https://registry.npmjs.org/qs/-/qs-6.10.1.tgz",
             "integrity": "sha512-M528Hph6wsSVOBiYUnGf+K/7w0hNshs/duGsNXPUCLH5XAqjEtiPGwNONLV0tBH8NoGb0mvD5JubnUTrujKDTg==",
+            "dev": true,
             "requires": {
                 "side-channel": "^1.0.4"
             }
@@ -2469,6 +2528,7 @@
             "version": "1.0.7",
             "resolved": "https://registry.npmjs.org/read/-/read-1.0.7.tgz",
             "integrity": "sha1-s9oZvQUkMal2cdRKQmNK33ELQMQ=",
+            "dev": true,
             "requires": {
                 "mute-stream": "~0.0.4"
             }
@@ -2575,6 +2635,7 @@
             "version": "3.0.2",
             "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
             "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
+            "dev": true,
             "requires": {
                 "glob": "^7.1.3"
             }
@@ -2615,7 +2676,6 @@
             "version": "7.3.5",
             "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.5.tgz",
             "integrity": "sha512-PoeGJYh8HK4BTO/a9Tf6ZG3veo/A7ZVsYrSA6J8ny9nb3B1VrpkuN+z9OE5wfE5p6H4LchYZsegiQgbJD94ZFQ==",
-            "dev": true,
             "requires": {
                 "lru-cache": "^6.0.0"
             }
@@ -2663,6 +2723,7 @@
             "version": "1.0.4",
             "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.0.4.tgz",
             "integrity": "sha512-q5XPytqFEIKHkGdiMIrY10mvLRvnQh42/+GoBlFW3b2LXLE2xxJpZFdm94we0BaoV3RwJyGqg5wS7epxTv0Zvw==",
+            "dev": true,
             "requires": {
                 "call-bind": "^1.0.0",
                 "get-intrinsic": "^1.0.2",
@@ -2737,7 +2798,8 @@
         "sprintf-js": {
             "version": "1.0.3",
             "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
-            "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw="
+            "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
+            "dev": true
         },
         "string-width": {
             "version": "4.2.2",
@@ -2792,6 +2854,7 @@
             "version": "5.5.0",
             "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
             "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+            "dev": true,
             "requires": {
                 "has-flag": "^3.0.0"
             }
@@ -2890,6 +2953,7 @@
             "version": "0.2.1",
             "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.2.1.tgz",
             "integrity": "sha512-76SUhtfqR2Ijn+xllcI5P1oyannHNHByD80W1q447gU3mp9G9PSpGdWmjUOHRDPiHYacIk66W7ubDTuPF3BEtQ==",
+            "dev": true,
             "requires": {
                 "rimraf": "^3.0.0"
             }
@@ -2939,7 +3003,8 @@
         "tunnel": {
             "version": "0.0.6",
             "resolved": "https://registry.npmjs.org/tunnel/-/tunnel-0.0.6.tgz",
-            "integrity": "sha512-1h/Lnq9yajKY2PEbBadPXj3VxsDDu844OnaAo52UVmIzIvwwtBPIuNvkjuzBlTWpfJyUbG3ez0KSBibQkj4ojg=="
+            "integrity": "sha512-1h/Lnq9yajKY2PEbBadPXj3VxsDDu844OnaAo52UVmIzIvwwtBPIuNvkjuzBlTWpfJyUbG3ez0KSBibQkj4ojg==",
+            "dev": true
         },
         "type-check": {
             "version": "0.4.0",
@@ -2960,6 +3025,7 @@
             "version": "1.8.6",
             "resolved": "https://registry.npmjs.org/typed-rest-client/-/typed-rest-client-1.8.6.tgz",
             "integrity": "sha512-xcQpTEAJw2DP7GqVNECh4dD+riS+C1qndXLfBCJ3xk0kqprtGN491P5KlmrDbKdtuW8NEcP/5ChxiJI3S9WYTA==",
+            "dev": true,
             "requires": {
                 "qs": "^6.9.1",
                 "tunnel": "0.0.6",
@@ -2975,12 +3041,14 @@
         "uc.micro": {
             "version": "1.0.6",
             "resolved": "https://registry.npmjs.org/uc.micro/-/uc.micro-1.0.6.tgz",
-            "integrity": "sha512-8Y75pvTYkLJW2hWQHXxoqRgV7qb9B+9vFEtidML+7koHUFapnVJAZ6cKs+Qjz5Aw3aZWHMC6u0wJE3At+nSGwA=="
+            "integrity": "sha512-8Y75pvTYkLJW2hWQHXxoqRgV7qb9B+9vFEtidML+7koHUFapnVJAZ6cKs+Qjz5Aw3aZWHMC6u0wJE3At+nSGwA==",
+            "dev": true
         },
         "underscore": {
             "version": "1.13.1",
             "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.13.1.tgz",
-            "integrity": "sha512-hzSoAVtJF+3ZtiFX0VgfFPHEDRm7Y/QPjGyNo4TVdnDTdft3tr8hEkD25a1jC+TjTuE7tkHGKkhwCgs9dgBB2g=="
+            "integrity": "sha512-hzSoAVtJF+3ZtiFX0VgfFPHEDRm7Y/QPjGyNo4TVdnDTdft3tr8hEkD25a1jC+TjTuE7tkHGKkhwCgs9dgBB2g==",
+            "dev": true
         },
         "unzipper": {
             "version": "0.10.11",
@@ -3012,7 +3080,8 @@
         "url-join": {
             "version": "1.1.0",
             "resolved": "https://registry.npmjs.org/url-join/-/url-join-1.1.0.tgz",
-            "integrity": "sha1-dBxsL0WWxIMNZxhGCSDQySIC3Hg="
+            "integrity": "sha1-dBxsL0WWxIMNZxhGCSDQySIC3Hg=",
+            "dev": true
         },
         "util-deprecate": {
             "version": "1.0.2",
@@ -3087,6 +3156,35 @@
                 }
             }
         },
+        "vscode-jsonrpc": {
+            "version": "6.0.0",
+            "resolved": "https://registry.npmjs.org/vscode-jsonrpc/-/vscode-jsonrpc-6.0.0.tgz",
+            "integrity": "sha512-wnJA4BnEjOSyFMvjZdpiOwhSq9uDoK8e/kpRJDTaMYzwlkrhG1fwDIZI94CLsLzlCK5cIbMMtFlJlfR57Lavmg=="
+        },
+        "vscode-languageclient": {
+            "version": "7.0.0",
+            "resolved": "https://registry.npmjs.org/vscode-languageclient/-/vscode-languageclient-7.0.0.tgz",
+            "integrity": "sha512-P9AXdAPlsCgslpP9pRxYPqkNYV7Xq8300/aZDpO35j1fJm/ncize8iGswzYlcvFw5DQUx4eVk+KvfXdL0rehNg==",
+            "requires": {
+                "minimatch": "^3.0.4",
+                "semver": "^7.3.4",
+                "vscode-languageserver-protocol": "3.16.0"
+            }
+        },
+        "vscode-languageserver-protocol": {
+            "version": "3.16.0",
+            "resolved": "https://registry.npmjs.org/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.16.0.tgz",
+            "integrity": "sha512-sdeUoAawceQdgIfTI+sdcwkiK2KU+2cbEYA0agzM2uqaUy2UpnnGHtWTHVEtS0ES4zHU0eMFRGN+oQgDxlD66A==",
+            "requires": {
+                "vscode-jsonrpc": "6.0.0",
+                "vscode-languageserver-types": "3.16.0"
+            }
+        },
+        "vscode-languageserver-types": {
+            "version": "3.16.0",
+            "resolved": "https://registry.npmjs.org/vscode-languageserver-types/-/vscode-languageserver-types-3.16.0.tgz",
+            "integrity": "sha512-k8luDIWJWyenLc5ToFQQMaSrqCHiLwyKPHKPQZ5zz21vM+vIVUSvsRpcbiECH4WR88K2XZqc4ScRcZ7nk/jbeA=="
+        },
         "vscode-test": {
             "version": "1.6.1",
             "resolved": "https://registry.npmjs.org/vscode-test/-/vscode-test-1.6.1.tgz",
@@ -3303,7 +3401,8 @@
         "wrappy": {
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-            "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+            "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+            "dev": true
         },
         "xml2js": {
             "version": "0.4.23",
@@ -3330,8 +3429,7 @@
         "yallist": {
             "version": "4.0.0",
             "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
-            "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
-            "dev": true
+            "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
         },
         "yargs": {
             "version": "16.2.0",
@@ -3376,6 +3474,7 @@
             "version": "2.10.0",
             "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
             "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
+            "dev": true,
             "requires": {
                 "buffer-crc32": "~0.2.3",
                 "fd-slicer": "~1.1.0"
@@ -3385,6 +3484,7 @@
             "version": "2.5.1",
             "resolved": "https://registry.npmjs.org/yazl/-/yazl-2.5.1.tgz",
             "integrity": "sha512-phENi2PLiHnHb6QBVot+dJnaAZ0xosj7p3fWl+znIjBDlnMI2PsZCJZ306BPTFOaHf5qdDEI8x5qFrSOBN5vrw==",
+            "dev": true,
             "requires": {
                 "buffer-crc32": "~0.2.3"
             }
diff --git a/package.json b/package.json
index 10c1895..7e123c3 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,17 @@
     ],
     "main": "./dist/extension.js",
     "contributes": {
+        "configuration": {
+            "title": "ldf-syntax-configuration",
+            "properties": {
+                "languageServerMaxProblems": {
+                    "scope": "resource",
+                    "type": "number",
+                    "default": 100,
+                    "description": ""
+                }
+            }
+        },
         "languages": [
             {
                 "id": "ldf",
@@ -93,5 +104,8 @@
         "webpack-cli": "^4.7.0",
         "yarn": "^1.22.17",
         "ovsx": "^0.2.1"
+    },
+    "dependencies": {
+        "vscode-languageclient": "^7.0.0"
     }
 }
diff --git a/server/server.py b/server/server.py
new file mode 100644
index 0000000..680c353
--- /dev/null
+++ b/server/server.py
@@ -0,0 +1,41 @@
+from pygls.capabilities import COMPLETION, TEXT_DOCUMENT_DID_OPEN, TEXT_DOCUMENT_DID_CLOSE
+from pygls.lsp.methods import DEFINITION, TEXT_DOCUMENT_DID_CHANGE
+from pygls.lsp.types.basic_structures import Location, Position, Range, TextDocumentRegistrationOptions
+from pygls.lsp.types.language_features.definition import DefinitionParams
+from pygls.lsp.types.workspace import DidChangeTextDocumentParams, DidCloseTextDocumentParams, DidOpenTextDocumentParams
+from pygls.server import LanguageServer
+from pygls.lsp import CompletionItem, CompletionList, CompletionOptions, CompletionParams
+import logging
+
+server = LanguageServer()
+
+@server.feature(COMPLETION, CompletionOptions(trigger_characters=[',']))
+def completions(server: LanguageServer, params: CompletionParams):
+    """Returns completion items."""
+    return CompletionList(
+        is_incomplete=False,
+        items=[
+            CompletionItem(label='{'),
+            CompletionItem(label='}'),
+        ]
+    )
+
+@server.feature(TEXT_DOCUMENT_DID_OPEN)
+async def openHandler(server: LanguageServer, params: DidOpenTextDocumentParams):
+    server.show_message_log(f"Opened document: {params.text_document.uri}")
+
+@server.feature(TEXT_DOCUMENT_DID_CLOSE)
+def closeHandler(server: LanguageServer, params: DidCloseTextDocumentParams):
+    server.show_message_log(f"Closed document: {params.text_document.uri}")
+
+@server.feature(TEXT_DOCUMENT_DID_CHANGE)
+def changeHandler(server: LanguageServer, params: DidChangeTextDocumentParams):
+    server.show_message_log(f"Changed document: {params.text_document.uri}")
+
+@server.feature(DEFINITION)
+def onDefinition(server: LanguageServer, params: DefinitionParams):
+    word = server.workspace.get_document(params.text_document.uri).word_at_position(params.position)
+    server.show_message_log(f"Requesting definition at {params.position.line}:{params.position.character} Word: {word}")
+    return Location(uri=params.text_document.uri, range=Range(start=Position(line=0, character=0), end=Position(line=0, character=0)))
+
+server.start_io()
diff --git a/src/extension.ts b/src/extension.ts
index ff255c9..a098c44 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -1,12 +1,55 @@
 // The module 'vscode' contains the VS Code extensibility API
 // Import the module and reference it with the alias vscode in your code below
+import path = require('path');
 import * as vscode from 'vscode';
+import {
+    LanguageClient,
+    LanguageClientOptions,
+    ServerOptions,
+    TransportKind,
+    Executable,
+    ExecutableOptions
+  } from 'vscode-languageclient/node';
+
+let client: LanguageClient;
 
 // this method is called when your extension is activated
 // your extension is activated the very first time the command is executed
 export function activate(context: vscode.ExtensionContext) {
+    let serverCommand = 'python ' + context.asAbsolutePath(path.join('server', 'server.py'));
+    let commandOptions: ExecutableOptions = { detached: false, shell: true };
+
+    let serverOptions: ServerOptions = {
+        run: <Executable>{command: serverCommand, options: commandOptions},
+        debug: <Executable>{command: serverCommand, options: commandOptions}
+    };
+
+    // Options to control the language client
+    let clientOptions: LanguageClientOptions = {
+        // Register the server for plain text documents
+        documentSelector: ['ldf'],
+        synchronize: {
+            // Synchronize the setting section 'languageServerExample' to the server
+            configurationSection: 'ldf-syntax-configuration',
+            // Notify the server about file changes to '.ldf files contain in the workspace
+            fileEvents: vscode.workspace.createFileSystemWatcher('**/*.ldf')
+        }
+    };
 
+    client = new LanguageClient(
+        'ldf-lsp',
+        'LDF Language Server',
+        serverOptions,
+        clientOptions
+    );
+
+    client.start();
 }
 
 // this method is called when your extension is deactivated
-export function deactivate() {}
+export function deactivate() {
+    if (!client) {
+        return undefined;
+    }
+    return client.stop();
+}