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description= We write the user’s IDs to their browser’s local storage, and use that as the user ID on cookies whenever possible. Local Storage is meant for storing this type of first-party information and helps us ensure high fidelity, first-party data.;
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Text of the page (random words):
rce data to customer io map data to other services scheduled syncs deleting data api call calculator servers node js python go customer data platforms segment segment data in classic rudderstack mparticle legacy webhook based integrations using zapier with the track api zoho integration hubspot integration data out getting started add a data out integration actions action triggers code mode database warehouse integrations introduction standard integrations advanced integrations filtering and mapping actions resend past data connections actable predictive adobe target algolia insights amazon redshift amazon redshift advanced amazon s3 amazon s3 advanced amplitude amplitude message metrics attio azure blob storage bing ads braze braze cohorts clevertap close commandbar cordial criteo audiences customer io facebook conversions api friendbuy fullstory gainsight px google ad conversions google ads gtag google analytics google bigquery google bigquery advanced google cloud storage google cloud storage advanced google sheets google tag manager gtm heap hubspot intercom koala launchdarkly livelike logrocket meta facebook pixel metronome mixpanel mixpanel message metrics moengage ms azure blob storage advanced pinterest conversions pipedrive playerzero qualtrics reporting webhooks ripe rudderstack legacy salesforce about this integration sent messages as tasks frequently asked questions saleswings segment segment message metrics sendgrid marketing automations slack snowflake snowflake advanced sprig talon one tiktok conversions twilio twilio engage messaging twilio studio twitter pixel visual website optimizer vwo webhooks wisepops yandex zendesk api reference about our apis comparing the pipelines and track apis pipelines api track api app api design studio html best practices journeys webhooks mobile sdks ios quick start guide getting started how it works authentication packages and configuration options swift 6 troubleshooting identify and track users identify profiles track events screen tracking mobile lifecycle events anonymous activity location tracking push notifications set up push notifications set up rich push app groups for push tracking deep links push metrics sound in push notifications provisional push push service certificates test your push implementation in app messages set up in app messaging inline in app messages page rules in app event listeners notification inbox what s new 4 x 4 4 0 3 x 4 0 0 3 x 3 13 0 3 x 3 9 0 2 x 3 x 1x 2 x changelog ios quick start guide getting started how it works authentication packages and configuration options troubleshooting identify and track users identify profiles track events screen tracking mobile lifecycle events anonymous activity push notifications set up push notifications set up rich push deep links push metrics sound in push notifications provisional push push service certificates test your push implementation in app messages set up in app messaging inline in app messages page rules in app event listeners what s new 3 x 3 13 0 3 x 3 9 0 2 x 3 x 1x 2 x changelog ios get started identify profiles track events push notifications rich push notifications in app messages test support changelog ios get started identify profiles track events push notifications in app messages test support update from 2 10 to 2 11 migrate from an earlier version troubleshooting changelog android quick start guide getting started how it works authentication packages and configuration options troubleshooting identify and track users identify profiles screen tracking mobile lifecycle events anonymous activity track events location tracking push notifications push notifications deep links channel push service certificates test your push implementation in app messages in app messages in app event listeners inline in app messages page rules notification inbox what s new 4 x 4 10 3 x 4 x 2 x 3 x changelog android get started identify profiles track events push notifications in app messages test support migrate from an earlier version troubleshooting changelog android get started identify profiles track events push notifications rich push notifications test support migrate from an earlier version changelog react native quick start guide getting started how it works authentication packages and configuration options troubleshooting identify and track users identify profiles track events screen tracking mobile lifecycle events anonymous activity location tracking push notifications set up push notifications app groups for push tracking deep links handling multiple push providers capture push metrics android channels in app messages set up in app messages inline in app messages in app event listeners notification inbox what s new 6 x 6 4 0 5 x 6 0 0 4 x 5 0 0 4 x 4 3 3 4x 4 x 3 x 3 4 2 x 3 x changelog react native quick start guide getting started how it works authentication packages and configuration options troubleshooting identify and track users identify profiles track events screen tracking mobile lifecycle events anonymous activity push notifications set up push notifications deep links handling multiple push providers capture push metrics android channels in app messages set up in app messages inline in app messages in app event listeners what s new 4 x 4 3 3 4x 4 x 3 x 3 4 2 x 3 x changelog react native quick start guide getting started how it works authentication packages and configuration options troubleshooting identify and track users identify profiles track events screen tracking mobile lifecycle events anonymous activity push notifications set up push notifications deep links handling multiple push providers capture push metrics android channels in app messages set up in app messages inline in app messages in app event listeners what s new 4 x 5 0 0 4 x 4 3 3 4x 4 x 3 x 3 4 2 x 3 x changelog react native get started identify profiles track events push notifications set up push notifications deep links handling multiple push providers capture push metrics in app messages set up in app messages in app event listeners updates and troubleshooting migrate from an earlier version troubleshooting changelog react native get started identify profiles track events push notifications set up push notifications deep links handling multiple push providers capture push metrics in app messages set up in app messages in app event listeners updates and troubleshooting migrate from an earlier version update to version 3 4 troubleshooting changelog expo quick start guide getting started how it works authentication packages and configuration options troubleshooting identify and track profiles identify profiles track events screen tracking mobile lifecycle events anonymous activity location tracking push notifications set up push notifications app groups for push tracking deep links capture push metrics android channels multiple push providers in app messages inline in app messages notification inbox set up in app messages in app event listeners what s new 3 x 3 3 2 x 3 x 1x 2 x changelog expo get started identify profiles track events push notifications set up push notifications deep links capture push metrics in app messages set up in app messages in app event listeners updates and troubleshooting troubleshooting changelog flutter quick start guide get started how it works authentication configuration options troubleshooting identify track users identify profiles mobile lifecycle events anonymous activity screen tracking track events location tracking push notifications set up push notifications app groups for push tracking deep links handling multiple push providers capture push metrics android channels in app messages in app messages inline in app messages notification inbox in app event listeners what s new 3 x 4 0 0 3 x 3 5 0 2 x 3 0 0 2 x 2 2 upgrade to flutter 2 x changelog flutter quick start guide get started how it works authentication configuration options troubleshooting identify track users identify profiles mobile lifecycle events anonymous activity screen tracking track events push notifications set up push notifications deep links handling multiple push providers capture push metrics android channels in app messages in app messages inline in app messages in app event listeners what s new 2 x 2 2 upgrade to flutter 2 x changelog flutter get started identify profiles track events update flutter sdk push notifications set up push notifications deep links handling multiple push providers capture push metrics in app messages in app messages in app event listeners updates and troubleshooting update ios troubleshooting changelog settings billing account verification audit logs tasks workspace performance billing how we bill billing for sms messages billing for whatsapp messages ai credits reducing billing overages payment problems canceling your account plan features builder plan your account manage team members how to add team members assign standard roles create assign custom roles access multiple accounts edit account information customize your ui manage your api credentials security best practices two factor authentication single sign on sso account regions us and eu enable experimental features workspaces workspaces in customer io understand timezone conversion case sensitivity and your data search your workspace privacy security session cookies and expiration allowlist our ip addresses customer io gdpr and you security mobile and app store privacy privacy respecting your users privacy ai settings customer io security qualifications troubleshooting troubleshooting login and browser issues create a har file for help troubleshooting releases this page is part of the customer io documentation for the complete documentation index see llms txt integrations data in connections javascript identity management md 30 managing your audience s identities updated june 27 2025 how it works our javascript client manages the identities of your audience first as an anonymousid then when you identify them you know them by their userid then we remove those values when a person logs out and you call cioanalytics reset we store user identity information in cookies and local storage you can retrieve or override this information as necessary to support your integrations this page provides information about the values we store where we store them and how to get or override them flowchart lr a person visits site generate anonymousid z subgraph z anonymous activity direction tb b visit a page b page c add item to cart c track d person logs in end subgraph y identified activity direction tb e person initiates checkout track f person finishes transaction f track g person logs out end d identify e g reset h person is anonymous again id persistence we write the user s ids to their browser s local storage and use that as the user id on cookies whenever possible if a user returns to your site after the cookie expires we ll look for an old id in the user s localstorage if we find an id we ll set it as the user s id again in the new cookie if a person clears their cookies and localstorage they ll remove all ids and they ll get a completely new anonymousid the next time they visit your site anonymous ids we generate a universally unique id uuid for website visitors when our javascript initializes and we set this value as the anonymousid for each new visitor to your site this happens before we load direct connection integrations so they don t generate their own user ids example ajs_anonymous_id 2239 ee7ea5 b6d8 4174 b612 04e1 ef3fa952 you can override the auto generated anonymousid in code using the methods described below set anonymousid before the ready method returns use a call to override the anonymousid set anonymousid in the options object of a call retrieve the anonymous id you can get the user s current anonymousid with the user method cioanalytics user anonymousid if the user doesn t have an anonymousid it s null this call will automatically generate and sets a new anonymousid for the user refreshing the anonymous id a user s anonymousid changes in any of the following situations they clear their cookies and localstorage your site or app calls cioanalytics reset during a user s browser session your site or app calls cioanalytics identify with a userid that is different from the current userid override the anonymous id you can also set the anonymousid immediately even before the ready method returns cioanalytics load writekey cioanalytics page cioanalytics setanonymousid abc 123 xyz you might use this method if you queue calls before ready returns and those methods require a custom anonymousid keep in mind that setting the anonymousid in analytics js does not overwrite the anonymous tracking ids for any other integrations you use direct connection integrations might have their own anonymous ids in some rare cases integrations might not use customer io s anonymousid read the documentation for your integration to find out if it sets its own id override the default anonymous id if the default anonymous uuid doesn t meet your needs you can override anonymousid for the current user using either of the following methods cioanalytics user anonymousid abc 123 xyz cioanalytics setanonymousid abc 123 xyz override anonymous ids using the options object you can override an anonymousid in the options object of identify page or track calls the custom anonymousid persists when you use the methods below even if you don t specify the anonymousid in the calls identify identify cioanalytics identify user_123 name jane kim anonymousid abc 123 xyz page page cioanalytics page anonymousid abc 123 xyz track track cioanalytics track email clicked calltoaction signup anonymousid abc 123 xyz saving traits to the context object traits are things that you know about a user or a group and which can change over time like attributes a key value pair that you associate with a person or an object like a person s name the date they were created in your workspace or a company s billing date etc use attributes to target people and personalize messages in customer io journeys the options object contains a child object called context that automatically captures data depending on the event and the sdk or library you use see our the context object to learn more the context object contains an optional traits dictionary this dictionary contains traits about the current user you can use this to retrieve information about a user that you set or stored as a result of previous identify calls this might be useful if you also want to send traits as properties in track or page calls the information you pass in traits does not appear in your downstream tools like salesforce mixpanel or google analytics but this data does appear in warehouses and storage integrations imagine that you sent this identify call cioanalytics identify 12091906 01011992 plan_id paid tier 2 email cool person example com you can pass the plan_id into context traits so you can use them in trac...
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