insomnia-plugin-request-body-prompts

Prompt users for variables in your Insomnia request body before sending a request.

Features

• Define prompt variables in your request body using the attribute pattern
  <<prompt question='Your question' type='type' default='value' nullable='true'>>
• Supports types (number, boolean, string) and nullability
• Shows a dialog before sending, allowing input per prompt (with defaults)
• All prompt variables in the body are replaced by your answers before the request is sent

Installation

1. In Insomnia, go to Preferences > Plugins
2. Search for insomnia-plugin-request-body-prompts
3. Install the plugin
4. Restart Insomnia if necessary

Usage

Set the Request Body

In your request body (e.g., JSON or raw text), insert variables using the prompt tag:

{
  "amount": "<<prompt question='Enter amount' type='number' default='42'>>",
  "active": "<<prompt question='Is active?' type='boolean' default='true'>>",
  "description": "<<prompt question='Description' nullable='true'>>"
}

Attributes:

• question (required): Text shown in the dialog
• type: "string" (default), "number", or "boolean"
• default: Default value pre-filled in the dialog (optional)
• nullable: "true" or "1" (optional) — allows null/empty answers

Defaults:
If you omit an attribute, the plugin uses these defaults:

• type='string'
• default='' (empty string)
• nullable=false

Operating principle

Body before sending:

{
  "amount": "<<prompt question='Enter amount' type='number' default='42'>>",
  "comment": "<<prompt question='Optional comment' nullable='true'>>"
}

On Send:

You’ll see a dialog for each prompt, with your question, default value, and type hint.

Resulting body (sent):

{
  "amount": 42,
  "comment": null
}

Prompt Cancellation

If you cancel a prompt (by clicking "Cancel" or closing the dialog),

The request will not be sent.

Insomnia will typically show an error box stating "Failed to transform request with plugins."

This is a limitation of the Insomnia plugin system: plugins cannot suppress this error box when aborting a request for user experience reasons.

You will not get a success response or an incomplete request.

Technical Notes

• Pattern:
  The plugin looks for variables matching:
  <<prompt question='...' [type='...'] [default='...'] [nullable='true']>>
• Insomnia Version:
  Supports Insomnia 11.x and newer (uses the async plugin API)
• Supported Body Types:
  JSON and raw text bodies. For other body types (form, multipart), the plugin does nothing.
• Do not use this plugin via the "Scripts" tab — only as a proper Insomnia plugin.

Troubleshooting

• If you do not see the dialog, make sure:
  • You are using a POST/PUT/PATCH request with a non-empty body
  • The body type is set to JSON or Text (raw)
  • You are using the correct <<prompt ...>> syntax (not curly braces)
• If you cancel a prompt, the request will be aborted and an error box will appear (this is expected).