diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 0000000..9c62828
--- /dev/null
+++ b/.eslintignore
@@ -0,0 +1,3 @@
+node_modules
+coverage
+dist
diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..58ce448
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,20 @@
+{
+  "env": {
+    "browser": true,
+    "node": true,
+    "es6": true,
+    "jest": true
+  },
+  "extends": ["eslint:recommended", "plugin:react/recommended"],
+  "plugins": ["react", "react-hooks"],
+  "parser": "babel-eslint",
+  "rules": {
+    "react-hooks/rules-of-hooks": "error",
+    "react-hooks/exhaustive-deps": "warn"
+  },
+  "settings": {
+    "react": {
+      "version": "detect"
+    }
+  }
+}
diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index a30c620..4e7646f 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -22,9 +22,10 @@ jobs:
       - name: Install latest npm
         run: npm install --global npm@latest
 
-      - name: npm install and test
+      - name: npm install, lint and test
         run: |
           npm install
+          npm run lint
           npm test -- --ci
         env:
           CI: true
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..879f612
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,5 @@
+node_modules
+coverage
+dist
+public
+tmp
diff --git a/CHANGELOG.md b/CHANGELOG.md
index aa71bd9..6cb9c68 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to this project are documented in this file.
 
+## Unreleased
+
+- Added: `changed` callback argument.
+
 ## 0.1.3
 
 - Added: `payload` and `method` arguments.
diff --git a/README.md b/README.md
index 0ebd3e4..d276015 100755
--- a/README.md
+++ b/README.md
@@ -13,7 +13,10 @@ If you need a simple way to load data quickly this is for you. It allows you to
 You can optionally specify a polling interval and manually trigger a refresh. It also gracefully cancels any open requests if you decide to change the URL and restarts timers if the polling interval changes.
 
 ```javascript
-const { data, loading, error, refresh } = useApi("https://some-api.com", 10000);
+const { data, loading, changed, error, refresh } = useApi(
+  "https://some-api.com",
+  10000
+);
 ```
 
 ## Installation
@@ -80,6 +83,7 @@ const PeopleSearch = () = {
 - `pollInterval` - How often to re-request updated data. Pass 0 to disable polling (the default behaviour).
 - `payload` - A data object to send in the request. If we are performing a GET request, it is appended into the querystring (e.g. `?keywords=hello`). If it is a POST request it is sent in the request body as JSON.
 - `method` - Set the request type, either `get` or `post`. (defaults to `get`)
+- `changed`: A function that is called if the data actually changed during the request. If this is specified, use-api does extra checking and compares old and new data. If data does not change, new data is not propagated and a redraw is saved. Please note, this may have performance repercussions if the data is large as it performs a deep comparison between new and old data to determine if they are equivalent.
 
 ### Output
 
diff --git a/index.js b/index.js
index 3979d0f..2d250ba 100755
--- a/index.js
+++ b/index.js
@@ -1,22 +1,27 @@
-const { useEffect, useState } = require("react");
+const { useEffect, useState, useRef } = require("react");
 const axios = require("axios");
+const isEqual = require("lodash.isequal");
 
 const { CancelToken } = axios;
 
-const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
+const useApi = (
+  apiEndpoint,
+  pollInterval,
+  payload,
+  method = "get",
+  changed
+) => {
   const [data, setData] = useState({});
   const [error, setError] = useState(null);
   const [loading, setLoading] = useState(true);
   const [poll, setPoll] = useState(0);
+  const lastData = useRef(data);
 
-  // Function to force a refresh
-  const refresh = () => setPoll(poll + 1);
+  if (method.toLowerCase) method = method.toLowerCase();
 
   useEffect(() => {
     let timeout;
 
-    if (method.toLowerCase) method = method.toLowerCase();
-
     if (!["get", "post"].includes(method)) {
       setLoading(false);
       setError("Invalid request method type, must be either post or get.");
@@ -39,8 +44,18 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
       .then(response => {
         // Make sure there are no errors reported
         setError(null);
-        // Set the recieved data
-        setData(response.data);
+
+        // Only do change detection if change is defined.
+        if (changed) {
+          if (!isEqual(response.data, lastData.current)) {
+            // Set the received data ONLY IF its changed, redraw performance gain!
+            lastData.current = response.data;
+            setData(response.data);
+            changed(response.data);
+          }
+        } else {
+          setData(response.data);
+        }
       })
       .catch(thrown => {
         // Only error on genuine errors, not cancellations
@@ -51,7 +66,8 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
         setLoading(false);
 
         // Poll if specified to do so
-        if (pollInterval) timeout = setTimeout(refresh, pollInterval);
+        if (pollInterval)
+          timeout = setTimeout(() => setPoll(poll + 1), pollInterval);
       });
 
     // Cleanup, clear a timeout and cancel the request.
@@ -59,9 +75,18 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
       if (timeout) clearTimeout(timeout);
       source.cancel();
     };
-  }, [poll, apiEndpoint, pollInterval]);
+  }, [
+    poll,
+    setPoll,
+    apiEndpoint,
+    pollInterval,
+    payload,
+    method,
+    lastData,
+    changed
+  ]);
 
-  return { data, loading, error, refresh };
+  return { data, loading, changed, error, refresh: () => setPoll(poll + 1) };
 };
 
 module.exports = useApi;
diff --git a/package-lock.json b/package-lock.json
index e81dc21..3f48bd8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -419,6 +419,22 @@
         "@types/yargs": "^13.0.0"
       }
     },
+    "@mrmlnc/readdir-enhanced": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/@mrmlnc/readdir-enhanced/-/readdir-enhanced-2.2.1.tgz",
+      "integrity": "sha512-bPHp6Ji8b41szTOcaP63VlnbbO5Ny6dwAATtY6JTjh5N2OLrb5Qk/Th5cRkRQhkWCt+EJsYrNB0MiL+Gpn6e3g==",
+      "dev": true,
+      "requires": {
+        "call-me-maybe": "^1.0.1",
+        "glob-to-regexp": "^0.3.0"
+      }
+    },
+    "@nodelib/fs.stat": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-1.1.3.tgz",
+      "integrity": "sha512-shAmDyaQC4H92APFoIaVDHCx5bStIocgvbwQyxPRrbUY20V1EYTbSDchWbuwlMG3V17cprZhA6+78JfB+3DTPw==",
+      "dev": true
+    },
     "@testing-library/react-hooks": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@testing-library/react-hooks/-/react-hooks-2.0.1.tgz",
@@ -471,6 +487,23 @@
         "@babel/types": "^7.3.0"
       }
     },
+    "@types/events": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@types/events/-/events-3.0.0.tgz",
+      "integrity": "sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==",
+      "dev": true
+    },
+    "@types/glob": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.1.tgz",
+      "integrity": "sha512-1Bh06cbWJUHMC97acuD6UMG29nMt0Aqz1vF3guLfG+kHHJhy3AyohZFFxYk2f7Q1SQIrNwvncxAE0N/9s70F2w==",
+      "dev": true,
+      "requires": {
+        "@types/events": "*",
+        "@types/minimatch": "*",
+        "@types/node": "*"
+      }
+    },
     "@types/istanbul-lib-coverage": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.1.tgz",
@@ -496,6 +529,18 @@
         "@types/istanbul-lib-report": "*"
       }
     },
+    "@types/minimatch": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
+      "integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==",
+      "dev": true
+    },
+    "@types/node": {
+      "version": "12.7.7",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.7.7.tgz",
+      "integrity": "sha512-4jUncNe2tj1nmrO/34PsRpZqYVnRV1svbU78cKhuQKkMntKB/AmdLyGgswcZKjFHEHGpiY8pVD8CuVI55nP54w==",
+      "dev": true
+    },
     "@types/prop-types": {
       "version": "15.7.2",
       "resolved": "https://registry.npmjs.org/@types/prop-types/-/prop-types-15.7.2.tgz",
@@ -564,6 +609,12 @@
         "acorn-walk": "^6.0.1"
       }
     },
+    "acorn-jsx": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.2.tgz",
+      "integrity": "sha512-tiNTrP1MP0QrChmD2DdupCr6HWSFeKVw5d/dHTu4Y7rkAkRhU/Dt7dphAfIUyxtHpl/eBVip5uTNSpQJHylpAw==",
+      "dev": true
+    },
     "acorn-walk": {
       "version": "6.2.0",
       "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.2.0.tgz",
@@ -613,6 +664,15 @@
         "normalize-path": "^2.1.1"
       }
     },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
     "arr-diff": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -637,6 +697,31 @@
       "integrity": "sha1-jCpe8kcv2ep0KwTHenUJO6J1fJM=",
       "dev": true
     },
+    "array-includes": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.0.3.tgz",
+      "integrity": "sha1-GEtI9i2S10UrsxsyMWXH+L0CJm0=",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.2",
+        "es-abstract": "^1.7.0"
+      }
+    },
+    "array-union": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
+      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+      "dev": true,
+      "requires": {
+        "array-uniq": "^1.0.1"
+      }
+    },
+    "array-uniq": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
+      "dev": true
+    },
     "array-unique": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
@@ -718,6 +803,20 @@
         "deep-equal": "^1.0.1"
       }
     },
+    "babel-eslint": {
+      "version": "10.0.3",
+      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-10.0.3.tgz",
+      "integrity": "sha512-z3U7eMY6r/3f3/JB9mTsLjyxrv0Yb1zb8PCWCLpguxfCzBIZUwy23R1t/XKewP+8mEN2Ck8Dtr4q20z6ce6SoA==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/parser": "^7.0.0",
+        "@babel/traverse": "^7.0.0",
+        "@babel/types": "^7.0.0",
+        "eslint-visitor-keys": "^1.0.0",
+        "resolve": "^1.12.0"
+      }
+    },
     "babel-jest": {
       "version": "24.9.0",
       "resolved": "https://registry.npmjs.org/babel-jest/-/babel-jest-24.9.0.tgz",
@@ -911,6 +1010,12 @@
       "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==",
       "dev": true
     },
+    "builtin-modules": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-3.1.0.tgz",
+      "integrity": "sha512-k0KL0aWZuBt2lrxrcASWDfwOLMnodeQjodT/1SxEQAXsHANgo6ZC/VEaSEHCXt7aSTZ4/4H5LKa+tBXmW7Vtvw==",
+      "dev": true
+    },
     "cache-base": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/cache-base/-/cache-base-1.0.1.tgz",
@@ -928,6 +1033,38 @@
         "unset-value": "^1.0.0"
       }
     },
+    "call-me-maybe": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/call-me-maybe/-/call-me-maybe-1.0.1.tgz",
+      "integrity": "sha1-JtII6onje1y95gJQoV8DHBak1ms=",
+      "dev": true
+    },
+    "caller-callsite": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/caller-callsite/-/caller-callsite-2.0.0.tgz",
+      "integrity": "sha1-hH4PzgoiN1CpoCfFSzNzGtMVQTQ=",
+      "dev": true,
+      "requires": {
+        "callsites": "^2.0.0"
+      },
+      "dependencies": {
+        "callsites": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/callsites/-/callsites-2.0.0.tgz",
+          "integrity": "sha1-BuuE8A7qQT2oav/vrL/7Ngk7PFA=",
+          "dev": true
+        }
+      }
+    },
+    "caller-path": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-2.0.0.tgz",
+      "integrity": "sha1-Ro+DBE42mrIBD6xfBs7uFbsssfQ=",
+      "dev": true,
+      "requires": {
+        "caller-callsite": "^2.0.0"
+      }
+    },
     "callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -966,6 +1103,12 @@
         "supports-color": "^5.3.0"
       }
     },
+    "chardet": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
+      "dev": true
+    },
     "ci-info": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
@@ -995,6 +1138,21 @@
         }
       }
     },
+    "cli-cursor": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
+      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "dev": true,
+      "requires": {
+        "restore-cursor": "^2.0.0"
+      }
+    },
+    "cli-width": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
+      "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
+      "dev": true
+    },
     "cliui": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
@@ -1040,6 +1198,12 @@
       "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
       "dev": true
     },
+    "code-point-at": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
+      "dev": true
+    },
     "collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
@@ -1114,6 +1278,36 @@
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
       "dev": true
     },
+    "cosmiconfig": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-5.2.1.tgz",
+      "integrity": "sha512-H65gsXo1SKjf8zmrJ67eJk8aIRKV5ff2D4uKZIBZShbhGSpEmsQOPW/SKMKYhSTrqR7ufy6RP69rPogdaPh/kA==",
+      "dev": true,
+      "requires": {
+        "import-fresh": "^2.0.0",
+        "is-directory": "^0.3.1",
+        "js-yaml": "^3.13.1",
+        "parse-json": "^4.0.0"
+      },
+      "dependencies": {
+        "import-fresh": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-2.0.0.tgz",
+          "integrity": "sha1-2BNVwVYS04bGH53dOSLUMEgipUY=",
+          "dev": true,
+          "requires": {
+            "caller-path": "^2.0.0",
+            "resolve-from": "^3.0.0"
+          }
+        },
+        "resolve-from": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-3.0.0.tgz",
+          "integrity": "sha1-six699nWiBvItuZTM17rywoYh0g=",
+          "dev": true
+        }
+      }
+    },
     "cross-spawn": {
       "version": "6.0.5",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
@@ -1283,12 +1477,36 @@
       "integrity": "sha1-9B8cEL5LAOh7XxPaaAdZ8sW/0+I=",
       "dev": true
     },
+    "diff": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-4.0.1.tgz",
+      "integrity": "sha512-s2+XdvhPCOF01LRQBC8hf4vhbVmI2CGS5aZnxLJlT5FtdhPCDFq80q++zK2KlrVorVDdL5BOGZ/VfLrVtYNF+Q==",
+      "dev": true
+    },
     "diff-sequences": {
       "version": "24.9.0",
       "resolved": "https://registry.npmjs.org/diff-sequences/-/diff-sequences-24.9.0.tgz",
       "integrity": "sha512-Dj6Wk3tWyTE+Fo1rW8v0Xhwk80um6yFYKbuAxc9c3EZxIHFDYwbi34Uk42u1CdnIiVorvt4RmlSDjIPyzGC2ew==",
       "dev": true
     },
+    "dir-glob": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/dir-glob/-/dir-glob-2.2.2.tgz",
+      "integrity": "sha512-f9LBi5QWzIW3I6e//uxZoLBlUt9kcp66qo0sSCxL6YZKc75R1c4MFCoe/LaZiBGmgujvQdxc5Bn3QhfyvK5Hsw==",
+      "dev": true,
+      "requires": {
+        "path-type": "^3.0.0"
+      }
+    },
+    "doctrine": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-3.0.0.tgz",
+      "integrity": "sha512-yS+Q5i3hBf7GBkd4KG8a7eBNNWNGLTaEwwYWUijIYM7zrlYDM0BFXHjjPWlWZ1Rg7UaddZeIDmi9jF3HmqiQ2w==",
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2"
+      }
+    },
     "domexception": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/domexception/-/domexception-1.0.1.tgz",
@@ -1388,6 +1606,191 @@
         }
       }
     },
+    "eslint": {
+      "version": "6.4.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-6.4.0.tgz",
+      "integrity": "sha512-WTVEzK3lSFoXUovDHEbkJqCVPEPwbhCq4trDktNI6ygs7aO41d4cDT0JFAT5MivzZeVLWlg7vHL+bgrQv/t3vA==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "ajv": "^6.10.0",
+        "chalk": "^2.1.0",
+        "cross-spawn": "^6.0.5",
+        "debug": "^4.0.1",
+        "doctrine": "^3.0.0",
+        "eslint-scope": "^5.0.0",
+        "eslint-utils": "^1.4.2",
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+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
+      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
+      "dev": true
+    },
     "sshpk": {
       "version": "1.16.1",
       "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.16.1.tgz",
@@ -4638,6 +5861,27 @@
         "strip-ansi": "^4.0.0"
       }
     },
+    "string-width": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+      "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+      "dev": true,
+      "requires": {
+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^4.0.0"
+      }
+    },
+    "string.prototype.padend": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/string.prototype.padend/-/string.prototype.padend-3.0.0.tgz",
+      "integrity": "sha1-86rvfBcZ8XDF6rHDK/eA2W4h8vA=",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.2",
+        "es-abstract": "^1.4.3",
+        "function-bind": "^1.0.2"
+      }
+    },
     "string.prototype.trimleft": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.0.tgz",
@@ -4679,6 +5923,12 @@
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
       "dev": true
     },
+    "strip-json-comments": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.0.1.tgz",
+      "integrity": "sha512-VTyMAUfdm047mwKl+u79WIdrZxtFtn+nBxHeb844XBQ9uMNTuTHdx2hc5RiAJYqwTj3wc/xe5HLSdJSkJ+WfZw==",
+      "dev": true
+    },
     "supports-color": {
       "version": "5.5.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
@@ -4694,6 +5944,46 @@
       "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
       "dev": true
     },
+    "table": {
+      "version": "5.4.6",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.4.6.tgz",
+      "integrity": "sha512-wmEc8m4fjnob4gt5riFRtTu/6+4rSe12TpAELNSqHMfF3IqnA+CH37USM6/YR3qRZv7e56kAEAtd6nKZaxe0Ug==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.10.2",
+        "lodash": "^4.17.14",
+        "slice-ansi": "^2.1.0",
+        "string-width": "^3.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
     "test-exclude": {
       "version": "5.2.3",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-5.2.3.tgz",
@@ -4706,12 +5996,33 @@
         "require-main-filename": "^2.0.0"
       }
     },
+    "text-table": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
     "throat": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/throat/-/throat-4.1.0.tgz",
       "integrity": "sha1-iQN8vJLFarGJJua6TLsgDhVnKmo=",
       "dev": true
     },
+    "through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+      "dev": true
+    },
+    "tmp": {
+      "version": "0.0.33",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+      "dev": true,
+      "requires": {
+        "os-tmpdir": "~1.0.2"
+      }
+    },
     "tmpl": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.4.tgz",
@@ -4797,6 +6108,12 @@
       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
       "dev": true
     },
+    "tslib": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+      "dev": true
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -4921,6 +6238,12 @@
       "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
       "dev": true
     },
+    "v8-compile-cache": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
+      "integrity": "sha512-usZBT3PW+LOjM25wbqIlZwPeJV+3OSz3M1k1Ws8snlW39dZyYL9lOGC5FgPVHfk0jKmjiDV8Z0mIbVQPiwFs7g==",
+      "dev": true
+    },
     "validate-npm-package-license": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -5058,6 +6381,15 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
     "write-file-atomic": {
       "version": "2.4.1",
       "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.1.tgz",
diff --git a/package.json b/package.json
index 744beec..6715978 100755
--- a/package.json
+++ b/package.json
@@ -24,7 +24,13 @@
   "scripts": {
     "test": "jest",
     "coverage": "jest --coverage",
-    "release": "np"
+    "release": "np",
+    "lint": "npm-run-all --parallel lint:*",
+    "lint:js": "eslint \"**/*.js\"",
+    "lint:format": "prettier \"**/*.{js,md}\" --check",
+    "fix": "npm-run-all --sequential fix:*",
+    "fix:js": "eslint \"**/*.js\" --fix",
+    "fix:format": "prettier \"**/*.{js,md}\" --write"
   },
   "author": "John Chipps-Harding (john@signal-noise.com)",
   "license": "MIT",
@@ -34,12 +40,22 @@
   "devDependencies": {
     "@testing-library/react-hooks": "^2.0.1",
     "axios-mock-adapter": "^1.17.0",
+    "babel-eslint": "^10.0.3",
+    "eslint": "^6.4.0",
+    "eslint-plugin-react": "^7.14.3",
+    "eslint-plugin-react-hooks": "^2.0.1",
+    "import-sort-cli": "^6.0.0",
+    "import-sort-parser-babylon": "^6.0.0",
+    "import-sort-style-module": "^6.0.0",
     "jest": "^24.8.0",
+    "npm-run-all": "^4.1.5",
+    "prettier": "^1.18.2",
     "react": "^16.9.0",
     "react-dom": "^16.9.0",
     "react-test-renderer": "^16.9.0"
   },
   "dependencies": {
-    "axios": "^0.19.0"
+    "axios": "^0.19.0",
+    "lodash.isequal": "^4.5.0"
   }
 }
diff --git a/test.js b/test.js
index 1c454a1..a8d8e9f 100755
--- a/test.js
+++ b/test.js
@@ -54,10 +54,11 @@ describe("performs requests", () => {
   });
 
   it("allows different formats of GET method param (GET)", async () => {
+    const params = { query: "hello" };
     mock.onGet(url).reply(200, "response");
 
     const { result, waitForNextUpdate } = renderHook(() =>
-      useApi(url, 0, { query: "hello" }, "GET")
+      useApi(url, 0, params, "GET")
     );
 
     await waitForNextUpdate();
@@ -67,10 +68,11 @@ describe("performs requests", () => {
   });
 
   it("allows different formats of GET method param (Get)", async () => {
+    const params = { query: "hello" };
     mock.onGet(url).reply(200, "response");
 
     const { result, waitForNextUpdate } = renderHook(() =>
-      useApi(url, 0, { query: "hello" }, "Get")
+      useApi(url, 0, params, "Get")
     );
 
     await waitForNextUpdate();
@@ -80,10 +82,11 @@ describe("performs requests", () => {
   });
 
   it("allows different formats of GET method param (gEt)", async () => {
+    const params = { query: "hello" };
     mock.onGet(url).reply(200, "response");
 
     const { result, waitForNextUpdate } = renderHook(() =>
-      useApi(url, 0, { query: "hello" }, "gEt")
+      useApi(url, 0, params, "gEt")
     );
 
     await waitForNextUpdate();
@@ -154,7 +157,7 @@ describe("performs requests", () => {
   it("warns about bad finding a bad string in method type", async () => {
     mock.onGet(url).reply(200, "response");
 
-    const { result, waitForNextUpdate } = renderHook(() =>
+    const { result } = renderHook(() =>
       useApi(url, 0, { query: "hello" }, "POSTITNOIE")
     );
 
@@ -165,7 +168,7 @@ describe("performs requests", () => {
   it("warns about garbage in method type", async () => {
     mock.onGet(url).reply(200, "response");
 
-    const { result, waitForNextUpdate } = renderHook(() =>
+    const { result } = renderHook(() =>
       useApi(url, 0, { query: "hello" }, { something: "wrong" })
     );
 
@@ -234,6 +237,44 @@ describe("performs requests", () => {
     expect(result.current.loading).toBeFalsy();
   });
 
+  it("refreshes when payload changes", async () => {
+    const postData = { query: "hello" };
+    const postData2 = { query: "world" };
+    mock.onPost(url, postData).reply(200, "response");
+
+    const { result, waitForNextUpdate, rerender } = renderHook(
+      ({ apiEndpoint, pollInterval, payload, method }) =>
+        useApi(apiEndpoint, pollInterval, payload, method),
+      {
+        initialProps: {
+          apiEndpoint: url,
+          pollInterval: 0,
+          payload: postData,
+          method: "post"
+        }
+      }
+    );
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response");
+    expect(result.current.loading).toBeFalsy();
+
+    mock.onPost(url, postData2).reply(200, "response2");
+
+    rerender({
+      apiEndpoint: url,
+      pollInterval: 0,
+      payload: postData2,
+      method: "post"
+    });
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response2");
+    expect(result.current.loading).toBeFalsy();
+  });
+
   it("returns an error on request error", async () => {
     mock.onGet(url).reply(404, "response");
 
@@ -247,4 +288,79 @@ describe("performs requests", () => {
     expect(result.current.error).toEqual("Request failed with status code 404");
     expect(result.current.loading).toBeFalsy();
   });
+
+  it("notified when data has changed", async () => {
+    mock.onGet(url).reply(200, "response");
+    const mockChanged = jest.fn();
+
+    const { result, waitForNextUpdate } = renderHook(() =>
+      useApi(url, 0, null, "get", mockChanged)
+    );
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response");
+    expect(result.current.loading).toBeFalsy();
+
+    mock.onGet(url).reply(200, "response2");
+
+    act(() => {
+      result.current.refresh();
+    });
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response2");
+    expect(result.current.loading).toBeFalsy();
+    expect(mockChanged.mock.calls.length).toBe(2);
+  });
+
+  it("does not notify when data has not changed", async () => {
+    mock.onGet(url).reply(200, "response");
+    const mockChanged = jest.fn();
+
+    const { result, waitForNextUpdate } = renderHook(() =>
+      useApi(url, 0, null, "get", mockChanged)
+    );
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response");
+    expect(result.current.loading).toBeFalsy();
+
+    act(() => {
+      result.current.refresh();
+    });
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response");
+    expect(result.current.loading).toBeFalsy();
+    expect(mockChanged.mock.calls.length).toBe(1);
+  });
+
+  it("request can be aborted mid-request", async () => {
+    mock.onGet(url).reply(() => new Promise(() => {}));
+    mock.onGet(url + "2").reply(200, "response2");
+
+    const { result, waitForNextUpdate, rerender } = renderHook(
+      ({ apiEndpoint, pollInterval }) => useApi(apiEndpoint, pollInterval),
+      {
+        initialProps: {
+          apiEndpoint: url,
+          pollInterval: 0
+        }
+      }
+    );
+
+    rerender({
+      apiEndpoint: url + "2",
+      pollInterval: 0
+    });
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response2");
+    expect(result.current.loading).toBeFalsy();
+  });
 });