---
title: "Userflow.js Installation"
slug: "userflowjs-installation"
description: "Install Userflow.js in your web app with simple steps to enhance user experience without affecting load speed. Secure your users' data effectively!"
updated: 2026-01-23T23:36:42Z
published: 2026-01-23T23:36:42Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.userflow.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Userflow.js Installation

Before your users can see the flows and other content you build, you need to install Userflow.js in your web app.

Userflow.js is a tiny piece of JavaScript code (~15 kB), which is loaded asynchronously in your web app, so it won’t affect your page load speed.

The installation is simple and only requires 3 quick steps:

- [Step 1: Choose installation method](/userflow/docs/userflowjs-installation#step-1-choose-installation-method)
- [Step 2: Install Userflow.js](/userflow/docs/userflowjs-installation#step-2a-npm-installation)
- [Step 3: Replace placeholders](/userflow/docs/userflowjs-installation#step-3-replace-placeholders)

With several optional steps:

- [Optional: Add custom attributes](/userflow/docs/userflowjs-installation#optional-add-custom-attributes)
- [Optional: Enforce identity verification](/userflow/docs/userflowjs-installation#optional-enforce-identity-verification)
- [Optional: Install Userflow for unauthenticated users](/userflow/docs/userflowjs-installation#optional-install-userflow-for-unauthenticated-users)

### Step 1: Choose installation method

Userflow.js can be installed in one of 2 ways:

- Browser apps using module bundlers (such as Webpack or Rollup)
  - Go to Step 2A (npm installation)
- Other browser apps and Google Tag Manager
  - Go to Step 2B (HTML snippet installation)

We also have specific instructions for special apps/tools:

- [Google Tag Manager](/userflow/docs/userflowjs-installation-in-google-tag-manager)
- [Electron apps via userflow-electron](https://github.com/userflow/userflow-electron)
- [GoHighLevel](/userflow/docs/userflowjs-installation-in-gohighlevel)
- [Self-hosted](https://help.userflow.com/shared/180644ef-6010-493c-927f-ba12ec075be2) (Not recommended; Must be reviewed by Userflow engineering)

### Step 2A: npm installation

We recommend installing Userflow.js using the [userflow.js npm package](https://www.npmjs.com/package/userflow.js).

First, run this in your Terminal:

```plaintext
npm install userflow.js
```

Import and use the `userflow` object from the `userflow.js` module:

```javascript
import userflow from 'userflow.js'

userflow.init('USERFLOW_TOKEN')
userflow.identify('USER_ID', {
  name: 'USER_NAME',
  email: 'USER_EMAIL',
  signed_up_at: 'USER_SIGNED_UP_AT'
})
```

**Important:** Make sure to replace the `GREEN` placeholders with real, dynamic values from your app! See [Step 3](/userflow/docs/userflowjs-installation#step-3-replace-placeholders).

### Step 2B: HTML snippet installation

*Only do this if you did not complete Step 2A.*

Copy-paste the following snippet into your HTML document before the ending `</body>` tag:

```javascript
<script>
  !function(){var e="undefined"==typeof window?{}:window,t=e.userflow,r=e.history;function n(t,n){return function(){var o=new CustomEvent(n),s=Array.prototype.slice.call(arguments),a=t.apply(r,s);return e.dispatchEvent(o),a}}if(r){e.__userflowStatePatched=!0;var o=r.pushState,s=r.replaceState;r.pushState=n(o,"userflow:pushstate"),r.replaceState=n(s,"userflow:replacestate")}if(!t){var a="https://js.userflow.com/",l=null;t=e.userflow={_stubbed:!0,load:function(){return l||(l=new Promise((function(t,r){var n=document.createElement("script");n.async=!0;var o=e.USERFLOWJS_ENV_VARS||{};"es2020"===(o.USERFLOWJS_BROWSER_TARGET||function(e){for(var t=[[/Edg\//,/Edg\/(\d+)/,80],[/OPR\//,/OPR\/(\d+)/,67],[/Chrome\//,/Chrome\/(\d+)/,80],[/CriOS\//,/CriOS\/(\d+)/,100],[/Safari\//,/Version\/(\d+)/,14],[/Firefox\//,/Firefox\/(\d+)/,74]],r=0;r<t.length;r++){var n=t[r],o=n[0],s=n[1],a=n[2];if(e.match(o)){var l=e.match(new RegExp(s));if(l&&parseInt(l[1],10)>=a)return"es2020";break}}return"legacy"}(navigator.userAgent))?(n.type="module",n.src=o.USERFLOWJS_ES2020_URL||a+"es2020/userflow.js"):n.src=o.USERFLOWJS_LEGACY_URL||a+"legacy/userflow.js",n.onload=function(){t()},n.onerror=function(){document.head.removeChild(n),l=null;var e=new Error("Could not load Userflow.js");console.warn(e.message),r(e)},document.head.appendChild(n)}))),l}};var u=e.USERFLOWJS_QUEUE=e.USERFLOWJS_QUEUE||[],i=function(e){t[e]=function(){var r=Array.prototype.slice.call(arguments);t.load(),u.push([e,null,r])}},c=function(e){t[e]=function(){var r,n=Array.prototype.slice.call(arguments);t.load();var o=new Promise((function(e,t){r={resolve:e,reject:t}}));return u.push([e,r,n]),o}},d=function(e,r){t[e]=function(){return r}};i("_setTargetEnv"),i("closeResourceCenter"),i("disableEvalJs"),i("init"),i("off"),i("on"),i("prepareAudio"),i("registerCustomInput"),i("remount"),i("reset"),i("setBaseZIndex"),i("setCustomInputSelector"),i("setCustomNavigate"),i("setCustomScrollIntoView"),i("setInferenceAttributeFilter"),i("setInferenceAttributeNames"),i("setInferenceClassNameFilter"),i("setResourceCenterLauncherHidden"),i("setScrollPadding"),i("setServerEndpoint"),i("setShadowDomEnabled"),i("setPageTrackingDisabled"),i("setUrlFilter"),i("setLinkUrlDecorator"),i("openResourceCenter"),i("toggleResourceCenter"),c("endAll"),c("endAllFlows"),c("endChecklist"),c("group"),c("identify"),c("identifyAnonymous"),c("start"),c("startFlow"),c("startWalk"),c("track"),c("updateGroup"),c("updateUser"),c("debugger"),d("getResourceCenterState",null),d("isIdentified",!1)}}();

  userflow.init('USERFLOW_TOKEN')
  userflow.identify('USER_ID', {
    name: 'USER_NAME',
    email: 'USER_EMAIL',
    signed_up_at: 'USER_SIGNED_UP_AT'
  })
</script>
```

**Important:** Make sure to replace the `GREEN` placeholders with real, dynamic values from your app! See [Step 3](/userflow/docs/userflowjs-installation#step-3-replace-placeholders).

### Step 3: Replace placeholders

In the code you copy-pasted above, replace `USERFLOW_TOKEN` with the Userflow.js Token you find under [Settings > Environments](/userflow/docs/environments-and-versions). Note that if you have multiple environments (e.g. Production and Staging) that each environment has a unique token.

Next, replace `USER_ID` with the currently signed in user’s ID in your database. Also replace `USER_NAME`, `USER_EMAIL` and `USER_SIGNED_UP_AT` with the user’s real, dynamic values. `signed_up_at` should be specified in ISO 8601 format. Example: `2019-12-11T12:34:56Z`.

The properties in `userflow.identify()`‘s second argument are all optional. They’re useful for looking up users in Userflow to e.g. see their flow progress, or to use in the flow content or conditions. If you don’t want to share this with Userflow, feel free to leave out the argument completely.

That’s it! Your Userflow installation is ready.

### Optional: Add custom attributes

Userflow.js supports sending custom attributes: Key-value pairs of data such as user role or other preferences. See [Userflow.js Reference](https://docs.userflow.com/docs/userflow-js#userflow-js-reference) for how to use attributes.

### Optional: Enforce identity verification

Identity verification is a Userflow security feature that prevents malicious third parties from impersonating your users.

We strongly recommend that you configure and enforce identity verification to safe-guard your users’ information.

[See the identity verification guide](/userflow/docs/identity-verification)

### Optional: Install Userflow for unauthenticated users

Running `userflow.identify()` is a mandatory part of the script. But if you want to show Userflow content on public pages to users who are not yet signed into your application, you can install the script on those pages and replace `userflow.identify()` with `userflow.identifyAnonymous()`. With this function Userflow.js will automatically assign the current user a unique ID. But note that they will count as users in the MAU balance.

When a User ID is created for an anonymous end user, it is unique and is also stored in local storage. When `userflow.identifyAnonymous()` is called during subsequent activity by the user, we reuse the already stored anonymous User ID from local storage.

[See userflow.identifyAnonymous() docs](https://app.userflow.com/docs/userflow-js#identifyanonymous)

## Related

- [Userflow.js installation in Google Tag Manager](/userflowjs-installation-in-google-tag-manager.md)
- [Userflow.js installation in GoHighLevel](/userflowjs-installation-in-gohighlevel.md)
- [Identity verification](/identity-verification-1.md)