FLAT
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  • Changelog
  • FLAT
  • Administration
    • Configuration
    • Docker
    • Logging
  • Cookbook
    • Using the Built-in Mocking
    • Performing Additional Checks on JWT Access Tokens
    • Logging Custom Fields
    • Using Environment Variables
    • Handling Errors with an Error Flow
    • File Serving
    • Forwarding a Request to an Upstream API
    • Extracting Common Initialization Flow Tasks
    • Encoding and Decoding JWT
    • Passing Header Fields to the Client
    • How can I pass an arbitrary header field to an upstream system?
    • Performing Additional Checks on JWT Access Tokens
    • Proxying requests to Upstream APIs
    • Increasing the Request Timeout
    • How can I see what the client requested?
    • Using Swagger UI for API Documentation
    • Testing API Requests
    • Testing with Backend Requests
    • Testing Templates
    • Sending POST Requests
    • Processing Upstream Responses
    • Protecting Access using JWT Tokens
  • Reference
    • Configuration
    • Debugging
    • flat CLI
    • Flow
    • Variables
    • OpenAPI / Swagger Integration
    • OpenAPI
      • CORS - Cross-Origin Resource Sharing
    • OpenAPI
      • Differences from Swagger
    • OpenAPI
      • Mocking
    • OpenAPI
      • Routing
    • OpenAPI
      • Security
    • OpenAPI
      • Upstream APIs
    • OpenAPI
      • Validation
    • Flow Actions
      • assert Action
      • auth Action
      • backend-flow Action
      • copy Action
      • debug Action
      • dump Action
      • echo Action
      • error Action
      • eval Action
      • log Action
      • nameshave Action
      • pass-body Action
      • proxy-request Action
      • regex Action
      • request Action
      • requests Action
      • serve Action
      • set-config Action
      • set-env Action
      • set-response-headers Action
      • set-status Action
      • sub-flow Action
      • template Action
      • test-request Action
      • xslt Action
    • Functions
      • apply-codecs()
      • array-reverse()
      • array()
      • base64-decode()
      • base64-encode()
      • body()
      • calc-signature()
      • capitalize-first()
      • content()
      • decrypt-xml()
      • decrypt()
      • encrypt()
      • ends-with()
      • file-exists()
      • fit-document()
      • fit-log()
      • fit-serialize()
      • get-log()
      • has-class()
      • html-parse()
      • join()
      • json-doc()
      • json-parse()
      • json-stringify()
      • json-to-csv()
      • json-to-xml()
      • jwt-decode()
      • jwt-encode()
      • ldap-lookup()
      • ldap-query()
      • lookup()
      • matches()
      • md5()
      • replace()
      • sort()
      • split()
      • tolower()
      • toupper()
      • trim()
      • unixtime()
      • urldecode(), url-decode()
      • urlencode(), url-encode()
      • uuid3() and uuid4()
      • verify-signature()
      • verify-xmldsig()
      • xml-parse()
      • xml-to-json()
    • Templating
      • {{,}}
      • Comment {{// …}}
      • Dot {{.}}
      • Conditional `{{if <condition>}} … {{elseif <condition> }} … {{else}} … {{end}}
      • loop
      • ?? Operator
      • Object XML Notation (OXN)
      • Pair Producer {{: …}}
      • Placeholder
      • Template Variables
      • with
    • Testing
  • Tutorial
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  1. Reference
  2. Templating

Placeholder

Values of JSON objects are addressed using property names separated by a slash (/).

📎 Note that the placeholder requires whitespace between the opening {{ and the expression. All other template commands must immediately follow the {{.

Example

Input:

{
  "account": {
    "name": "alice",
    "mail": "alice@example.com",
    "id": 4711
  }
}

Template:

<template>
{
  "user": {{ account/name}},
  "id": {{ account/id }},
  "admin": {{ account/id = 0 }}
}
</template>

Result:

{
  "user": "alice",
  "id": 4711,
  "admin": false
}

The placeholder generates typed output. For example, no quotes ("") should be used to enclose the {{ … }} expression, since a string result will automatically be emitted with quotes during execution of the template. Without explicit quotes, all JSON types, including numbers, boolean values or arrays and objects can be produced correctly.

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Last updated 5 years ago

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