Variables
About Variables¶
Variables are a very important part of Custom Actions. A Webhook.site Variable is characterized by a name surrounded by two dollar signs: $example$. They act as placeholders that are replaced by dynamic content as the request or email is received.
In the Custom Actions editor, variables can be used in any field that has a ⓥ icon.
Each request, email or DNSHook has a set of Base Variables that are always present and contain information like the request IP, method, headers, query string values, form values and the request content.
To see a list of Variables in the Custom Actions editor, click the Variables button in the editor. Clicking on a variable copies it to the clipboard.
After clicking Test on an action, additional variables created by the actions are also shown.
Many Actions set at least one variable. For example, the result of a JSONPath query can be registered to a variable like $jsonpath$ and entered in a "Modify Response" action to make the response dynamic, or even use it to send a request to another URL via the HTTP Request action – and then use the response of that!
Files can referred to and incorporated in Custom Action workflows via the request.file.* Base Variables.
Variables work since Custom Actions are executed synchronously in a chain, sharing data as they're being executed.
Global Variables¶
In Webhook.site Control Panel, you can define Global Variables which can be accessed between all URLs and used in Schedules. Global Variables are permanent.
Global Variables can also be created, modified or deleted using Custom Actions, including in WebhookScript and JavaScript actions.
Additionally, Global Variables can be managed using the Webhook.site API.
Base Variables¶
These variables are automatically available for each request or email. Different variables are available depending on the type.
| Variable Name | Available For | Description |
|---|---|---|
| request.uuid | All | The UUID of the request |
| request.token_id | All | The Token UUID (URL ID) of the request |
| request.content | All | The body content of the request |
| request.date | All | Creation date in Y-m-d H:m:s format |
| request.timestamp | All | Creation date in UNIX timestamp format |
| request.hostname | All | Hostname of the request (usually webhook.site) |
| request.header.[name] | All | Created for each HTTP header |
| request.size | All | Request body size in bytes |
| request.type | All | Request type (email or web) |
| request.file.[name].filename | All | Created for each file upload, with name being the input name property. Contains the client file name |
| request.file.[name].size | All | Contains the file size in bytes |
| request.file.[name].content | All | Contains the file content |
| request.file.[name].content_type | All | Contains the file content type (e.g. image/png) |
| request.file.[name].id | All | Contains the Webhook.site file ID |
| request.file.[name].link | All | Contains the direct download link to the file from Webhook.site's server. |
| request.query.[name] | Web | Created for each query string (e.g. ?name=value). The variable name is normalized. |
| request.form.[name] | Web | Created for each form field. The variable name is normalized. |
| request.ip | Web | IP of the host making the request |
| request.user_agent | Web | User agent header |
| request.url | Web | Full URL of the request (e.g. https://webhook.site/xxx-xxx...) |
| request.path | Web | Sub-path of URL, after the token ID. Defaults to / |
| request.query | Web | Full query string of the URL |
| request.method | Web | HTTP method (GET, POST, etc.) |
| request.sender | Sender address | |
| request.message_id | Email message ID | |
| request.text_content | Parsed plaintext content | |
| request.html_content | Parsed HTML content | |
| request.destinations | Comma separated list of recipients. | |
| request.checks.[name] | True or false for email checks (DKIM, SPF, etc.) |
Variable Modifiers¶
Adding specific suffixes to variable names will let you process the value in the following ways:
| Variable | Example Input | Output | Description |
|---|---|---|---|
| $example$ | {"json": "value"} |
{"json": "value"} |
no modifier |
| $example.json$ | {"json": "value"} |
{\"json\": \"value\"} |
Escapes all special JSON characters, allowing to use any string in a JSON object. Escaped characters include \b, \f, \n, \r, \t, ", \ |
| $example.html_encode$ | <p>some html</p> |
<p>some html</p> |
Escapes all special HTML characters |
| $example.html_decode$ | <p>some html</p> |
<p>some html</p> |
Replaces all escaped HTML escapes with normal characters |
| $example.html_strip$ | <p>some html</p> |
some html |
Removes all HTML tags from input string |
| $example.base64_encode$ | {"json": "<b>value</b>"} |
eyJqc29uIjogIjxiPnZhbHVlPC9iPiJ9Cg== |
Encodes the variable to base64 |
| $example.base64_decode$ | eyJqc29uIjogIjxiPnZhbHVlPC9iPiJ9Cg== |
{"json": "<b>value</b>"} |
Decodes a base64 encoded string |
| $example.url_encode$ | {"json": "value"} |
%7B%22json%22%3A+%22value%22%7D |
Escapes all special HTTP URL characters |
| $example.url_decode$ | %7B%22json%22%3A+%22value%22%7D |
{"json": "value"} |
Replaces all special HTTP URL escapes with normal characters |
| $example.upper$ | Hello World |
HELLO WORLD |
Uppercases a string |
| $example.lower$ | Hello World |
hello world |
Lowercases a string |