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Template expressions allow you to reference dynamic values in your flow configuration using the {{path.to.value}} syntax.

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Basic Syntax

{{variable}}
{{object.property}}
{{array[0]}}
{{object.nested.property}}

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Accessing Context Data

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Request Data

PathDescription
{{request.method}}HTTP method (GET, POST, etc.)
{{request.path}}Request path
{{request.body}}Request body (parsed JSON)
{{request.body.fieldName}}Specific body field
{{request.query}}Query parameters object
{{request.query.paramName}}Specific query parameter
{{request.headers}}Request headers
{{request.headers.Authorization}}Specific header
{{request.params}}Path parameters
{{request.params.id}}Specific path parameter

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Secrets and Environment Variables

Access secrets stored in your project using the env namespace. These are sensitive values like API keys, tokens, and credentials that you’ve added via the Secrets API. 
{{env.API_KEY}}
{{env.DATABASE_URL}}
{{env.WEBHOOK_SECRET}}
{{env.STRIPE_API_KEY}}
Secrets are:
  • Encrypted at rest
  • Never logged in execution history
  • Isolated per project
See Secrets for how to create and manage secrets.

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Node Outputs

Access output from previously executed nodes: 
{{node_id.output}}
{{node_id.output.fieldName}}
{{node_id.output.nested.property}}
Examples: 
{{fetch_user.output.body.id}}
{{validate_input.output.data.email}}
{{transform_data.output.total}}

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HTTP Node Output

{{http_node.output.status_code}}
{{http_node.output.headers}}
{{http_node.output.body}}
{{http_node.output.latency_ms}}
{{http_node.output.success}}

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Loop Context

Inside loop nodes:
PathDescription
{{item}}Current item (or custom name via as)
{{index}}Current iteration index (0-based, or custom via index)

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Error Context

Inside try/catch blocks:
PathDescription
{{error.message}}Error message
{{error.node}}ID of the node that failed
{{error.type}}Type of error

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Using Pipes

Transform values inline using pipes: 
{{value | pipeName}}
{{value | pipeName:arg}}
{{value | pipeName:arg1:arg2}}
{{value | pipe1 | pipe2 | pipe3}}
Examples: 
{{users | count}}
{{items | filter:status=active}}
{{orders | sum:amount}}
{{name | upper}}
{{data | default:fallback_value}}
See Pipes Reference for all available pipes.

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Expressions in Configuration

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In Strings

{
  "url": "https://api.example.com/users/{{user_id}}"
}

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In Objects

{
  "body": {
    "name": "{{request.body.name}}",
    "email": "{{request.body.email}}",
    "created_at": "{{now}}"
  }
}

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In Arrays

{
  "ids": ["{{id1}}", "{{id2}}", "{{id3}}"]
}

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Whole Value Replacement

When a template is the entire value, it preserves the original type: 
{
  "data": "{{fetch_data.output.body}}"
}
If fetch_data.output.body is an object, data will be that object.

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Arithmetic Expressions

In transform nodes, simple arithmetic is evaluated: 
{
  "total": "{{subtotal}} + {{tax}}",
  "discounted": "{{price}} * 0.9",
  "per_item": "{{total}} / {{quantity}}",
  "remaining": "{{budget}} - {{spent}}"
}
Supported operators: +, -, *, /

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Condition Expressions

In condition and switch nodes: 
{{value}} == "string"
{{value}} == 123
{{value}} != null
{{value}} > 10
{{value}} >= 10
{{value}} < 100
{{value}} <= 100
{{value}} == true
{{value}} == false

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Operators

OperatorDescription
==Equal
!=Not equal
>Greater than
>=Greater than or equal
<Less than
<=Less than or equal

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Special Variables

VariableDescription
{{now}}Current timestamp (ISO 8601)
{{request_id}}Unique request identifier

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Nested Path Access

Access deeply nested values: 
{{user.profile.address.city}}
{{orders[0].items[0].product.name}}
{{response.data.results[0].id}}

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Default Values

Use the default pipe for fallback values: 
{{user.name | default:Anonymous}}
{{settings.theme | default:light}}
{{request.query.page | default:1}}

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Type Coercion

Templates automatically handle type coercion when needed:
  • String templates return strings
  • Whole-value templates preserve original types
  • Comparison expressions return booleans
  • Arithmetic expressions return numbers

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Examples

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Building a URL

{
  "url": "https://{{env.API_HOST}}/v1/users/{{request.params.id}}/posts?limit={{request.query.limit | default:10}}"
}

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Dynamic Headers

{
  "headers": {
    "Authorization": "Bearer {{env.API_TOKEN}}",
    "X-Request-ID": "{{request_id}}",
    "X-User-ID": "{{auth.user_id}}"
  }
}

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Computed Response

{
  "body": {
    "user": "{{fetch_user.output.body | pick:id:name:email}}",
    "posts_count": "{{fetch_posts.output.body | count}}",
    "recent_posts": "{{fetch_posts.output.body | slice:5}}",
    "total_likes": "{{fetch_posts.output.body | sum:likes}}"
  }
}

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Conditional Logic Data

{
  "conditions": [
    {
      "if": "{{user.role}} == admin",
      "then": ["admin_flow"]
    },
    {
      "if": "{{user.subscription}} != null",
      "then": ["premium_flow"]
    }
  ],
  "else": ["basic_flow"]
}