Template Variables¶

Template variables let you generate dynamic, realistic data in your mock responses. Use double curly braces: {{variableName}}.

Basic Usage¶

In your response body:

{
  "id": "{{uuid}}",
  "name": "{{name}}",
  "email": "{{email}}"
}

Each request generates fresh random data.

Request Data¶

Access data from the incoming request:

Variable	Description	Example
`{{params.id}}`	Path parameter	`/users/{id}` -> `{{params.id}}`
`{{query.page}}`	Query string	`?page=2` -> `{{query.page}}`
`{{body.name}}`	Request body field	JSON body access
`{{headers.authorization}}`	Request header	Header value

Environment Variables¶

Access variables from the active environment:

Variable	Description
`{{env.VAR_NAME}}`	Value of `VAR_NAME` from the active environment

Environment variables are set in the Environments panel. Select an active environment to make its variables available in templates, proxy target URLs, and authentication fields. See Environments for full details on creating and managing environments.

{
  "api_key": "{{env.API_KEY}}",
  "base_url": "{{env.BASE_URL}}"
}

If no environment is active or the variable is not defined, {{env.VAR_NAME}} resolves to an empty string.

Available Helpers¶

Identity¶

Helper	Output
`{{uuid}}`	`a1b2c3d4-e5f6-7890-...`
`{{name}}`	`John Smith`
`{{firstName}}`	`John`
`{{lastName}}`	`Smith`
`{{username}}`	`jsmith42`

Contact¶

Helper	Output
`{{email}}`	`john.smith@example.com`
`{{phone}}`	`(555) 123-4567`

Location¶

Helper	Output
`{{address}}`	`123 Main St`
`{{city}}`	`San Francisco`
`{{state}}`	`California`
`{{zipCode}}`	`94102`
`{{country}}`	`United States`

Business¶

Helper	Output
`{{company}}`	`Acme Corp`
`{{jobTitle}}`	`Software Engineer`

Internet¶

Helper	Output
`{{url}}`	`https://example.com/page`
`{{domain}}`	`example.com`
`{{ipv4}}`	`192.168.1.1`

Date & Time¶

Helper	Output
`{{date}}`	`2026-01-15`
`{{timestamp}}`	`1737043200`
`{{pastDate}}`	Date in the past
`{{futureDate}}`	Date in the future

Numbers¶

Helper	Output
`{{number 1 100}}`	Random integer 1-100
`{{float 0 1 2}}`	Random float with 2 decimals
`{{boolean}}`	`true` or `false`

Text¶

Helper	Output
`{{lorem}}`	Lorem ipsum paragraph
`{{sentence}}`	Random sentence
`{{word}}`	Random word

Arrays with Repeat¶

Generate arrays of items:

[
  {{#repeat 5}}
  {
    "id": "{{uuid}}",
    "name": "{{name}}"
  }{{#unless @last}},{{/unless}}
  {{/repeat}}
]

Generates an array of 5 user objects.

Full Reference¶

See Template Helpers Reference for the complete list.