diff --git a/.gitignore b/.gitignore
index 681a182..2a83cd8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .idea
 bin
 cp.out
+node_modules
diff --git a/js-app/app.js b/js-app/app.js
new file mode 100644
index 0000000..7c20e51
--- /dev/null
+++ b/js-app/app.js
@@ -0,0 +1,87 @@
+const express = require('express')
+const cors = require('cors')
+const app = express()
+
+app.use(cors())
+
+const port = 3000
+
+
+const MongoClient = require('mongodb').MongoClient;
+// TODO env
+const url = "mongodb://localhost:27017/";
+
+let dbo
+
+MongoClient.connect(url, function (err, db) {
+    dbo = db.db("local");
+})
+
+function isNormalInteger(str) {
+    const n = Math.floor(Number(str));
+    return n !== Infinity && String(n) === str && n >= 0;
+}
+
+const handler = async (req, res) => {
+    const selector = req.params.selector;
+
+    const perPage = isNormalInteger(req.query.per_page) ? parseInt(req.query.per_page) : 10
+    const page = isNormalInteger(req.query.page) ? parseInt(req.query.page) : 1
+    const skip = perPage * (page - 1)
+
+    let query = {};
+    if (selector) {
+        if (isNormalInteger(selector)) {
+            const dealID = parseInt(selector)
+            query = {"_id": dealID}
+        } else {
+            query = {"$or": [{"proposal.piececid": selector}, {"proposal.provider": selector}]}
+        }
+    }
+
+    let deals = await dbo.collection("deals").find(query).limit(perPage).skip(skip).sort({"_id": -1}).toArray()
+
+    deals = await Promise.all(deals.map(async deal => {
+
+        const dealID = deal.dealid
+        const sector = await dbo.collection("sectors").findOne({"info.info.dealids": dealID})
+
+        let Status = "";
+        let sectorID = "";
+
+        if (sector) {
+            if (sector.Recovery) {
+                Status = "Recovery"
+            } else if (sector.Fault) {
+                Status = "Fault"
+            } else {
+                Status = "Active"
+            }
+
+            sectorID = sector.ID
+        }
+
+        return {
+            "DealInfo": deal,
+            "DealID": dealID,
+            "SectorID": sectorID,
+            "SectorInfo": sector,
+            "Status": Status
+        }
+    }))
+
+    const response = {
+        "Pagination": {
+            "Page": page,
+            "PerPage": perPage
+        },
+        "Deals": deals
+    }
+
+    res.send(response);
+}
+
+app.get('/deals', handler)
+app.get('/deals/:selector', handler)
+
+app.listen(port, () => console.log(`CID checker app listening at http://localhost:${port}`))
diff --git a/js-app/blockwatcher.js b/js-app/blockwatcher.js
new file mode 100644
index 0000000..52f0691
--- /dev/null
+++ b/js-app/blockwatcher.js
@@ -0,0 +1,161 @@
+const cbor = require('cbor');
+const got = require('got');
+
+const MongoClient = require('mongodb').MongoClient;
+// TODO env
+const url = "mongodb://localhost:27017/";
+
+let dbo
+
+MongoClient.connect(url, function (err, db) {
+    dbo = db.db("local");
+})
+
+const rpcUrl = 'http://3.9.46.104:1234/rpc/v0';
+
+const requestChainHead = {
+    "jsonrpc": "2.0",
+    "method": "Filecoin.ChainHead",
+    "id": 1,
+    "params": []
+}
+
+const requestStateMarketDeals = {
+    "jsonrpc": "2.0",
+    "method": "Filecoin.StateMarketDeals",
+    "id": 1,
+    "params": [[]]
+}
+
+const requestStateMinerSectors = minerId => {
+    return {
+        "jsonrpc": "2.0",
+        "method": "Filecoin.StateMinerSectors",
+        "id": 1,
+        "params": [minerId, null, null, null]
+    }
+}
+
+const requestStateGetActor = minerId => {
+    return {
+        "jsonrpc": "2.0",
+        "method": "Filecoin.StateGetActor",
+        "id": 1,
+        "params": [minerId, null]
+    }
+}
+
+const requestChainReadObj = cid => {
+    return {
+        "jsonrpc": "2.0",
+        "method": "Filecoin.ChainReadObj",
+        "id": 1,
+        "params": [{"/": cid}]
+    }
+}
+
+const DealsProcessor = async () => {
+    console.log("Fetching deals from Lotus node")
+
+    const {body} = await got.post(rpcUrl, {
+        json: requestStateMarketDeals,
+        responseType: 'json'
+    });
+
+    let writeOps = []
+
+    Object.keys(body.result).forEach(function (key) {
+
+        writeOps.push({
+            "replaceOne": {
+                "filter": {"_id": key},
+                "replacement": body.result[key],
+                "upsert": true
+            }
+        });
+
+    });
+
+    await dbo.collection("deals").bulkWrite(writeOps)
+}
+
+const SectorsProcessor = async () => {
+    console.log("Fetching sectors from Lotus node")
+
+    let minersList = await dbo.collection("deals1").distinct("Proposal.Provider")
+
+    let writeOps = []
+
+    for (const minerId of minersList) {
+        const {body} = await got.post(rpcUrl, {
+            json: requestStateMinerSectors(minerId),
+            responseType: 'json'
+        });
+
+        if (body.result != null) {
+            for (const sector of body.result) {
+                writeOps.push({
+                    "updateOne": {
+                        "filter": {"_id": sector.ID},
+                        "update": {"$set": {"Info": sector.Info}},
+                        "upsert": true
+                    }
+                });
+            }
+        }
+    }
+
+    await dbo.collection("sectors").bulkWrite(writeOps)
+}
+
+const MinersProcessor = async () => {
+    console.log("Fetching miners from Lotus node")
+
+    let minersList = await dbo.collection("deals").distinct("Proposal.Provider")
+
+    for (const minerId of minersList) {
+        let response = await got.post(rpcUrl, {
+            json: requestStateGetActor(minerId),
+            responseType: 'json'
+        });
+
+        let minerActorHead = response.body.result.Head['/']
+
+        response = await got.post(rpcUrl, {
+            json: requestChainReadObj(minerActorHead),
+            responseType: 'json'
+        });
+
+        // TODO: UnmarshalCBOR response.body.result (minerStateBytes)
+        console.log(response.body.result)
+
+        // TODO: collect faults and recoveries
+    }
+
+    // TODO: save faults and recoveries
+}
+
+
+let height = 0;
+
+loopHandler = async () => {
+    const {body} = await got.post(rpcUrl, {
+        json: requestChainHead,
+        responseType: 'json'
+    });
+
+    if (body.result.Height > height) {
+        height = body.result.Height;
+
+        await DealsProcessor()
+        await SectorsProcessor()
+        await MinersProcessor()
+    }
+
+}
+
+(async () => {
+    while (true) {
+        await loopHandler()
+    }
+})();
diff --git a/js-app/package-lock.json b/js-app/package-lock.json
new file mode 100644
index 0000000..f33af27
--- /dev/null
+++ b/js-app/package-lock.json
@@ -0,0 +1,742 @@
+{
+  "name": "cid-ckecker",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@sindresorhus/is": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-3.0.0.tgz",
+      "integrity": "sha512-kqA5I6Yun7PBHk8WN9BBP1c7FfN2SrD05GuVSEYPqDb4nerv7HqYfgBfMIKmT/EuejURkJKLZuLyGKGs6WEG9w=="
+    },
+    "@szmarczak/http-timer": {
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/@szmarczak/http-timer/-/http-timer-4.0.5.tgz",
+      "integrity": "sha512-PyRA9sm1Yayuj5OIoJ1hGt2YISX45w9WcFbh6ddT0Z/0yaFxOtGLInr4jUfU1EAFVs0Yfyfev4RNwBlUaHdlDQ==",
+      "requires": {
+        "defer-to-connect": "^2.0.0"
+      }
+    },
+    "@types/cacheable-request": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/@types/cacheable-request/-/cacheable-request-6.0.1.tgz",
+      "integrity": "sha512-ykFq2zmBGOCbpIXtoVbz4SKY5QriWPh3AjyU4G74RYbtt5yOc5OfaY75ftjg7mikMOla1CTGpX3lLbuJh8DTrQ==",
+      "requires": {
+        "@types/http-cache-semantics": "*",
+        "@types/keyv": "*",
+        "@types/node": "*",
+        "@types/responselike": "*"
+      }
+    },
+    "@types/http-cache-semantics": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@types/http-cache-semantics/-/http-cache-semantics-4.0.0.tgz",
+      "integrity": "sha512-c3Xy026kOF7QOTn00hbIllV1dLR9hG9NkSrLQgCVs8NF6sBU+VGWjD3wLPhmh1TYAc7ugCFsvHYMN4VcBN1U1A=="
+    },
+    "@types/keyv": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/@types/keyv/-/keyv-3.1.1.tgz",
+      "integrity": "sha512-MPtoySlAZQ37VoLaPcTHCu1RWJ4llDkULYZIzOYxlhxBqYPB0RsRlmMU0R6tahtFe27mIdkHV+551ZWV4PLmVw==",
+      "requires": {
+        "@types/node": "*"
+      }
+    },
+    "@types/node": {
+      "version": "14.0.23",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.0.23.tgz",
+      "integrity": "sha512-Z4U8yDAl5TFkmYsZdFPdjeMa57NOvnaf1tljHzhouaPEp7LCj2JKkejpI1ODviIAQuW4CcQmxkQ77rnLsOOoKw=="
+    },
+    "@types/responselike": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@types/responselike/-/responselike-1.0.0.tgz",
+      "integrity": "sha512-85Y2BjiufFzaMIlvJDvTTB8Fxl2xfLo4HgmHzVBz08w4wDePCTjYw66PdrolO0kzli3yam/YCgRufyo1DdQVTA==",
+      "requires": {
+        "@types/node": "*"
+      }
+    },
+    "accepts": {
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
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+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
+    "array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
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+      "requires": {
+        "readable-stream": "^2.3.5",
+        "safe-buffer": "^5.1.1"
+      }
+    },
+    "body-parser": {
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+      "requires": {
+        "bytes": "3.1.0",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "http-errors": "1.7.2",
+        "iconv-lite": "0.4.24",
+        "on-finished": "~2.3.0",
+        "qs": "6.7.0",
+        "raw-body": "2.4.0",
+        "type-is": "~1.6.17"
+      }
+    },
+    "bson": {
+      "version": "1.1.4",
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+    },
+    "cacheable-lookup": {
+      "version": "5.0.3",
+      "resolved": "https://registry.npmjs.org/cacheable-lookup/-/cacheable-lookup-5.0.3.tgz",
+      "integrity": "sha512-W+JBqF9SWe18A72XFzN/V/CULFzPm7sBXzzR6ekkE+3tLG72wFZrBiBZhrZuDoYexop4PHJVdFAKb/Nj9+tm9w=="
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+      "requires": {
+        "clone-response": "^1.0.2",
+        "get-stream": "^5.1.0",
+        "http-cache-semantics": "^4.0.0",
+        "keyv": "^4.0.0",
+        "lowercase-keys": "^2.0.0",
+        "normalize-url": "^4.1.0",
+        "responselike": "^2.0.0"
+      }
+    },
+    "cbor": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/cbor/-/cbor-5.0.2.tgz",
+      "integrity": "sha512-6JiKVURxxO92FntzTJq54QdN/8fBaBwD7+nNyGIAi1HL9mBgU3YK6ULV8k7WTuT/EwfRsjy3MuqDKlkQMCmfXg==",
+      "requires": {
+        "bignumber.js": "^9.0.0",
+        "nofilter": "^1.0.3"
+      }
+    },
+    "clone-response": {
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diff --git a/js-app/package.json b/js-app/package.json
new file mode 100644
index 0000000..d38b665
--- /dev/null
+++ b/js-app/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "cid-ckecker",
+  "version": "1.0.0",
+  "description": "",
+  "main": "app.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "cbor": "^5.0.2",
+    "cors": "^2.8.5",
+    "express": "^4.17.1",
+    "got": "^11.5.1",
+    "mongodb": "^3.5.9"
+  }
+}