Template Expressions

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

Basic Syntax

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

Accessing Context Data

Request Data

Path	Description
`{{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

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.

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}}

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}}

Loop Context

Inside loop nodes:

Path	Description
`{{item}}`	Current item (or custom name via `as`)
`{{index}}`	Current iteration index (0-based, or custom via `index`)

Error Context

Inside try/catch blocks:

Path	Description
`{{error.message}}`	Error message
`{{error.node}}`	ID of the node that failed
`{{error.type}}`	Type of error

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.

Expressions in Configuration

In Strings

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

In Objects

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

In Arrays

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

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.

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: +, -, *, /

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

Operators

Operator	Description
`==`	Equal
`!=`	Not equal
`>`	Greater than
`>=`	Greater than or equal
`<`	Less than
`<=`	Less than or equal

Special Variables

Variable	Description
`{{now}}`	Current timestamp (ISO 8601)
`{{request_id}}`	Unique request identifier

Nested Path Access

Access deeply nested values:

{{user.profile.address.city}}
{{orders[0].items[0].product.name}}
{{response.data.results[0].id}}

Default Values

Use the default pipe for fallback values:

{{user.name | default:Anonymous}}
{{settings.theme | default:light}}
{{request.query.page | default:1}}

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

Examples

Building a URL

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

Dynamic Headers

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

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}}"
  }
}

Conditional Logic Data

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

Secrets - Store and use API keys and credentials
Pipes Reference - Transform data inline
Transform Node - Create computed values
Set Node - Store values for later use

Getting Started

Triggers

Nodes

Reference

Template Expressions

Basic Syntax

Accessing Context Data

Request Data

Secrets and Environment Variables

Node Outputs

HTTP Node Output

Loop Context

Error Context

Using Pipes

Expressions in Configuration

In Strings

In Objects

In Arrays

Whole Value Replacement

Arithmetic Expressions

Condition Expressions

Operators

Special Variables

Nested Path Access

Default Values

Type Coercion

Examples

Building a URL

Dynamic Headers

Computed Response

Conditional Logic Data

​Basic Syntax

​Accessing Context Data

​Request Data

​Secrets and Environment Variables

​Node Outputs

​HTTP Node Output

​Loop Context

​Error Context

​Using Pipes

​Expressions in Configuration

​In Strings

​In Objects

​In Arrays

​Whole Value Replacement

​Arithmetic Expressions

​Condition Expressions

​Operators

​Special Variables

​Nested Path Access

​Default Values

​Type Coercion

​Examples

​Building a URL

​Dynamic Headers

​Computed Response

​Conditional Logic Data

​Related

Basic Syntax

Accessing Context Data

Request Data

Secrets and Environment Variables

Node Outputs

HTTP Node Output

Loop Context

Error Context

Using Pipes

Expressions in Configuration

In Strings

In Objects

In Arrays

Whole Value Replacement

Arithmetic Expressions

Condition Expressions

Operators

Special Variables

Nested Path Access

Default Values

Type Coercion

Examples

Building a URL

Dynamic Headers

Computed Response

Conditional Logic Data

Related