diff --git a/client/config.js b/client/config.js
index 20f5748..566323d 100644
--- a/client/config.js
+++ b/client/config.js
@@ -2,6 +2,23 @@
 
 export default {
   pageSize: 10,
+  filter: [
+    {
+      label: "Serial number",
+      parameter: "DeviceID.SerialNumber",
+      type: "string"
+    },
+    {
+      label: "Product class",
+      parameter: "DeviceID.ProductClass",
+      type: "string"
+    },
+    {
+      label: "Tag",
+      parameter: "tag",
+      type: "string"
+    }
+  ],
   index: [
     {
       label: "Serial number",
diff --git a/client/css/app.css b/client/css/app.css
index 5454683..75ae270 100644
--- a/client/css/app.css
+++ b/client/css/app.css
@@ -200,3 +200,13 @@ button {
     color: var(--color2);
   }
 }
+
+.filter {
+  margin-bottom: 0.5em;
+  & > input {
+    padding: 2px;
+    width: 30em;
+    font-size: 90%;
+    display: block;
+  }
+}
diff --git a/client/devices-page.js b/client/devices-page.js
index ad6223d..ea6faba 100644
--- a/client/devices-page.js
+++ b/client/devices-page.js
@@ -3,13 +3,14 @@
 import m from "mithril";
 
 import config from "./config";
+import filterComponent from "./filter-component";
 
 function load(filter, limit) {
   return new Promise((resolve, reject) => {
     m
       .request({
         url: "/api/devices/",
-        data: { filter: JSON.stringify(filter), limit: limit }
+        data: { filter: filter, limit: limit }
       })
       .then(res => {
         resolve(res);
@@ -29,8 +30,9 @@ function count(filter, limit) {
     m
       .request({
         method: "HEAD",
-        url: "/api/devices/",
-        data: { filter: JSON.stringify(filter), limit: limit },
+        url:
+          "/api/devices/?" +
+          m.buildQueryString({ filter: filter, limit: limit }),
         extract: extract
       })
       .then(res => {
@@ -43,9 +45,45 @@ function count(filter, limit) {
   });
 }
 
+function preprocessFilter(filter) {
+  if (Array.isArray(filter)) {
+    filter = filter.map(f => {
+      f = f.trim();
+      if (f.startsWith("(")) return f;
+
+      let match = f.match(/([^=<>]+)([=<>]+)(.+)/);
+
+      let param = match[1].trim();
+      let op = match[2].trim();
+      let value = match[3].trim();
+
+      try {
+        value = JSON.parse(value);
+      } catch (err) {
+        // eslint-disable-line no-empty
+      }
+
+      for (let cf of config.filter)
+        if (param === cf.label) param = cf.parameter;
+
+      if (param === "tag") {
+        let tag = value.replace(/[^a-zA-Z0-9]/g, "_");
+        if (op === "=") return `Tags.${tag} is not null`;
+        else if (op === "<>") return `Tags.${tag} is null`;
+      }
+
+      return `${param} ${op} ${JSON.stringify(value)}`;
+    });
+    filter = "(" + filter.join(") AND (") + ")";
+  }
+  return filter;
+}
+
 function init(args) {
   return new Promise((resolve, reject) => {
-    Promise.all([count(args.filter), load(args.filter, config.pageSize)])
+    let filter = preprocessFilter(args.filter);
+
+    Promise.all([count(filter), load(filter, config.pageSize)])
       .then(res => {
         resolve({ filter: args.filter, total: res[0], devices: res[1] });
       })
@@ -93,15 +131,18 @@ const component = {
     document.title = "Devices - GenieACS";
     function showMore() {
       const lastDevice = vnode.attrs.devices[vnode.attrs.devices.length - 1];
-      let f = Object.assign({}, vnode.attrs.filter, {
-        "DeviceID.ID>": lastDevice["DeviceID.ID"].value[0]
-      });
-      load(f, config.pageSize).then(res => {
+      let f = (vnode.attrs.filter || []).concat(
+        `DeviceID.ID > "${lastDevice["DeviceID.ID"].value[0]}"`
+      );
+      load(preprocessFilter(f), config.pageSize).then(res => {
         vnode.attrs.devices = vnode.attrs.devices.concat(res);
+        if (res.length < config.pageSize)
+          vnode.attrs.total = vnode.attrs.devices.length;
       });
     }
     return [
       m("h1", "Listing devices"),
+      m(filterComponent, { filterList: [].concat(vnode.attrs.filter) }),
       renderTable(
         vnode.attrs.devices,
         config.index,
diff --git a/client/filter-component.js b/client/filter-component.js
new file mode 100644
index 0000000..8f2f401
--- /dev/null
+++ b/client/filter-component.js
@@ -0,0 +1,41 @@
+"use strict";
+
+import m from "mithril";
+
+import config from "./config";
+
+const component = {
+  view: vnode => {
+    let a = m(
+      "datalist#filters",
+      config.filter.map(f => m("option", { value: `${f.label} = ` }))
+    );
+
+    const filterList = vnode.attrs.filterList.filter(f => {
+      return !!f;
+    });
+    filterList.push("");
+
+    return m(
+      "div.filter",
+      [m("b", "Filter"), a].concat(
+        filterList.map((fltr, idx) => {
+          return m("input", {
+            type: "string",
+            list: "filters",
+            value: fltr,
+            onchange: function(e) {
+              e.redraw = false;
+              filterList[idx] = this.value;
+              m.route.set("/devices", {
+                filter: filterList.filter(f => !!f)
+              });
+            }
+          });
+        })
+      )
+    );
+  }
+};
+
+export default component;
diff --git a/server/api-functions.js b/server/api-functions.js
index 131dfe1..1a583ae 100644
--- a/server/api-functions.js
+++ b/server/api-functions.js
@@ -7,34 +7,68 @@ const querystring = require("querystring");
 
 const config = require("./config");
 const device = require("./device");
+const filterParser = require("./filter-parser");
 
 const commaAscii = ",".charCodeAt(0);
 const newLineAscii = "\n".charCodeAt(0);
 
-function filtersToQuery(filters) {
-  if (!Array.isArray(filters)) filters = [filters];
+function filterToQuery(filter, negate = false, res = {}) {
+  const op = filter[0];
 
-  let queries = [];
-  for (let filter of filters) {
-    let q = {};
-    for (let [k, v] of Object.entries(filter)) {
-      let [param, op] = k.split(/([^a-zA-Z0-9\-_.].*)/, 2);
-      if (!op || op === "=") q[param] = v;
-      else if (op === ">") q[param] = { $gt: v };
-      else throw new Error(`Operator "${op}" not recognized`);
+  if ((!negate && op === "AND") || (negate && op === "OR")) {
+    for (let i = 1; i < filter.length; ++i)
+      filterToQuery(filter[i], negate, res);
+  } else if ((!negate && op === "OR") || (negate && op === "AND")) {
+    res["$or"] = res["$or"] || [];
+
+    for (let i = 1; i < filter.length; ++i)
+      res["$or"].push(filterToQuery(filter[i], negate));
+  } else if (op === "NOT") {
+    filterToQuery(filter[1], !negate, res);
+  } else if (op === "=") {
+    let p = (res[filter[1]] = res[filter[1]] || {});
+    if (negate) p["$ne"] = filter[2];
+    else p["$eq"] = filter[2];
+  } else if (op === "<>") {
+    let p = (res[filter[1]] = res[filter[1]] || {});
+    if (negate) {
+      p["$eq"] = filter[2];
+    } else {
+      p["$ne"] = filter[2];
+      p["$exists"] = true;
     }
-    queries.push(q);
+  } else if (op === ">") {
+    let p = (res[filter[1]] = res[filter[1]] || {});
+    if (negate) p = p["$not"] = p["$not"] || {};
+    p["$gt"] = filter[2];
+  } else if (op === ">=") {
+    let p = (res[filter[1]] = res[filter[1]] || {});
+    if (negate) p = p["$not"] = p["$not"] || {};
+    p["$gte"] = filter[2];
+  } else if (op === "<") {
+    let p = (res[filter[1]] = res[filter[1]] || {});
+    if (negate) p = p["$not"] = p["$not"] || {};
+    p["$lt"] = filter[2];
+  } else if (op === "<=") {
+    let p = (res[filter[1]] = res[filter[1]] || {});
+    if (negate) p = p["$not"] = p["$not"] || {};
+    p["$lte"] = filter[2];
+  } else if (op === "IS NULL") {
+    res[filter[1]] = { $exists: negate };
+  } else if (op === "IS NOT NULL") {
+    res[filter[1]] = { $exists: !negate };
+  } else {
+    throw new Error(`Unrecognized operator ${op}`);
   }
 
-  if (queries.length === 1) return queries[0];
-  else return { $or: queries };
+  return res;
 }
 
-function count(resource, filters, limit) {
+function count(resource, filter, limit) {
   return new Promise((resolve, reject) => {
     let qs = {};
-    if (filters) {
-      let q = filtersToQuery(filters);
+    if (filter) {
+      let q = filterToQuery(filterParser.parse(filter));
       if (resource === "devices") q = device.transposeQuery(q);
       qs.query = JSON.stringify(q);
     }
@@ -62,14 +96,15 @@ function count(resource, filters, limit) {
   });
 }
 
-function query(resource, filters, limit, callback) {
+function query(resource, filter, limit, callback) {
   return new Promise((resolve, reject) => {
     let ret;
     if (!callback) ret = [];
     let qs = {};
-    if (filters) {
-      let q = filtersToQuery(filters);
+    if (filter) {
+      let q = filterToQuery(filterParser.parse(filter));
       if (resource === "devices") q = device.transposeQuery(q);
+
       qs.query = JSON.stringify(q);
     }
 
diff --git a/server/api.js b/server/api.js
index d7e3381..3bf2645 100644
--- a/server/api.js
+++ b/server/api.js
@@ -17,14 +17,7 @@ const resources = {
 for (let [resource, update] of Object.entries(resources)) {
   router.head(`/${resource}`, async ctx => {
     let filter, limit;
-    if (ctx.request.query.filter)
-      if (Array.isArray(ctx.request.query.filter))
-        filter = ctx.request.query.query.map(q => JSON.parse(q));
-      else {
-        filter = JSON.parse(ctx.request.query.filter);
-        if (!Array.isArray(filter)) filter = [filter];
-      }
-
+    if (ctx.request.query.filter) filter = ctx.request.query.filter;
     if (ctx.request.query.limit) limit = +ctx.request.query.limit;
 
     let count = await apiFunctions.count(resource, filter, limit);
@@ -34,28 +27,21 @@ for (let [resource, update] of Object.entries(resources)) {
 
   router.get(`/${resource}`, async ctx => {
     let filter, limit;
-    if (ctx.request.query.filter)
-      if (Array.isArray(ctx.request.query.filter))
-        filter = ctx.request.query.query.map(q => JSON.parse(q));
-      else {
-        filter = JSON.parse(ctx.request.query.filter);
-        if (!Array.isArray(filter)) filter = [filter];
-      }
-
+    if (ctx.request.query.filter) filter = ctx.request.query.filter;
     if (ctx.request.query.limit) limit = +ctx.request.query.limit;
 
     ctx.body = await apiFunctions.query(resource, filter, limit);
   });
 
   router.head(`/${resource}/:id`, async (ctx, next) => {
-    let filter = { _id: ctx.params.id };
+    let filter = `DeviceID.ID = "${ctx.params.id}"`;
     let res = await apiFunctions.query(resource, filter);
     if (!res.length) return next();
     ctx.body = "";
   });
 
   router.get(`/${resource}/:id`, async (ctx, next) => {
-    let filter = { _id: ctx.params.id };
+    let filter = `DeviceID.ID = "${ctx.params.id}"`;
     let res = await apiFunctions.query(resource, filter);
     if (!res.length) return next();
     ctx.body = res[0];
diff --git a/server/device.js b/server/device.js
index aefea8f..fd57a79 100644
--- a/server/device.js
+++ b/server/device.js
@@ -142,8 +142,29 @@ function transposeQuery(query) {
   const newQuery = {};
 
   for (let [key, val] of Object.entries(query))
-    if (key.startsWith("$")) newQuery[key] = transposeQuery(val);
-    else if (key === "DeviceID.ID") newQuery["_id"] = val;
+    if (key.startsWith("$")) {
+      newQuery[key] = val.map(v => transposeQuery(v));
+    } else if (key === "DeviceID.ID") {
+      newQuery["_id"] = val;
+    } else if (key === "DeviceID.SerialNumber") {
+      newQuery["_deviceId._SerialNumber"] = val;
+    } else if (key === "DeviceID.OUI") {
+      newQuery["_deviceId._OUI"] = val;
+    } else if (key === "DeviceID.Manufacturer") {
+      newQuery["_deviceId._Manufacturer"] = val;
+    } else if (key.startsWith("Tags.")) {
+      if (val["$exists"] === true) {
+        newQuery["_tags"] = newQuery["_tags"] || {};
+        newQuery["_tags"]["$all"] = newQuery["_tags"]["$all"] || [];
+        newQuery["_tags"]["$all"].push(key.slice(5));
+      } else if (val["$exists"] === false) {
+        newQuery["_tags"] = newQuery["_tags"] || {};
+        newQuery["_tags"]["$nin"] = newQuery["_tags"]["$nin"] || [];
+        newQuery["_tags"]["$nin"].push(key.slice(5));
+      }
+    } else {
+      newQuery[key] = val;
+    }
 
   return newQuery;
 }