# Personalization ## Personalization ### Personalize emails inline To personalize the `subject`, `html`, and `text` fields for each recipient, use the [LiquidJS](https://liquidjs.com) templating language. Enclose each variable name in double curly braces (`{{ }}`). For every variable in your content, include a matching key in the `variables` object for each recipient in the `to` array. To get email messages to render properly, provide a default value for every variable. When a recipient's variables don't contain the corresponding data, the email message displays a generic value. ```bash curl -X POST 'https://comms.twilio.com/v1/Emails' \ -H 'Content-Type: application/json' \ -d '{ "from": { "address": "support@example.com", "name": "Support Team" }, "to": [ { "address": "jane.doe@example.com", "variables": { "firstName": "Jane", "lastName": "Doe" } }, { "address": "john.doe@example.com", "variables": { "firstName": "John", "lastName": "Doe" } } ], "content": { "subject": "Hello {{ firstName | default: '\''there'\'' }}", "html": "

Hey {{ firstName | default: '\''there'\'' }} {{ lastName }}, your order is ready.

", "text": "Hey {{ firstName | default: '\''there'\'' }} {{ lastName }}, your order is ready." } }' \ -u $TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN ``` ### Advanced templating The Email API supports [LiquidJS](https://liquidjs.com) for advanced email templating. In addition to simple variable replacement, you can use control flow structures like `if` and `unless`. This allows personalization that renders parts of an email for only specific recipients. ```bash curl -X POST 'https://comms.twilio.com/v1/Emails' \ -H 'Content-Type: application/json' \ -d '{ "from": { "address": "marketing@example.com", "name": "Marketing Team" }, "to": [ { "address": "jane.doe@example.com", "variables": { "firstName": "Jane", "plan": "premium" } }, { "address": "john.doe@example.com", "variables": { "firstName": "John", "plan": "free" } } ], "content": { "subject": "Your monthly update, {{ firstName | default: '\''there'\'' }}", "html": "

Hello {{ firstName | default: '\''there'\'' }}!

{% if plan == '\''premium'\'' %}

Thank you for being a premium member. Here are your exclusive benefits.

{% endif %}", "text": "Hello {{ firstName | default: '\''there'\'' }}! {% if plan == '\''premium'\'' %}Thank you for being a premium member. Here are your exclusive benefits.{% endif %}" } }' \ -u $TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN ``` ## Next steps * To learn about tracking the status of your email sends, see [Operations and Email Tracking](/docs/email/api/operations-and-email-tracking). * To view delivery activity in the Console, see [Email logs](/docs/email/logs).