PostBin

Create HTTP request bins and capture requests for debugging webhooks.

Overview

PostBin (postb.in) is a free, public HTTP request catcher service. This tool allows creating temporary bins that collect incoming HTTP requests, sending test requests to those bins, and retrieving the captured request data. It supports two resources: Bin (create, get, delete) and Request (get a specific request, remove the first/oldest request, send a test request). Bins are temporary and expire automatically. No authentication is required. The Bin ID format is two 13-digit numbers separated by a dash (e.g., 1234567890123-1234567890123). The tool accepts full PostBin URLs or raw bin IDs.

Category: Data & Storage
Tool Name: postbin
Version: 1

Appearance: Icon: lucide-Inbox | Color: #6E42CE

Node Type

Action — processes input items and produces output

Input / Output

Direction	Port(s)
Input	Input
Output	Output, Error

Credentials

This tool does not require any credentials.

Resources

Resource	Value
Bin	bin
Request	request

Operations

Each resource has its own operation list. Choose the resource first, then the operation.

Resource	Operation	Value	Description
Bin	Create	create	Create a new bin
Bin	Get	get	Get a bin
Bin	Delete	delete	Delete a bin
Request	Get	get	Get a specific captured request
Request	Remove First	removeFirst	Remove and return the first (oldest) request from a bin
Request	Send	send	Send a test request to the bin

Parameters

Bin: Create takes no parameters of its own — see All Operations.

Bin: Get

Parameter	Type	Required	Default	Description
Bin ID	string	Yes	—	Unique identifier for the bin. Accepts a raw ID (e.g., 1234567890123-1234567890123) or a full PostBin URL. Supports expressions like {{ $json.binId }}.

Bin: Delete

Parameter	Type	Required	Default	Description
Bin ID	string	Yes	—	Unique identifier for the bin. Accepts a raw ID (e.g., 1234567890123-1234567890123) or a full PostBin URL. Supports expressions like {{ $json.binId }}.

Request: Get

Parameter	Type	Required	Default	Description
Bin ID	string	Yes	—	Unique identifier for the bin. Accepts a raw ID (e.g., 1234567890123-1234567890123) or a full PostBin URL. Supports expressions like {{ $json.binId }}.
Request ID	string	Yes	—	Unique identifier for the captured request. Supports expressions like {{ $json.requestId }}.

Request: Remove First

Parameter	Type	Required	Default	Description
Bin ID	string	Yes	—	Unique identifier for the bin. Accepts a raw ID (e.g., 1234567890123-1234567890123) or a full PostBin URL. Supports expressions like {{ $json.binId }}.

Request: Send

Parameter	Type	Required	Default	Description
Bin ID	string	Yes	—	Unique identifier for the bin. Accepts a raw ID (e.g., 1234567890123-1234567890123) or a full PostBin URL. Supports expressions like {{ $json.binId }}.
Bin Content	string	No	—	Content to include in the test request body. Sent as the “content” property in the JSON body. Supports expressions like {{ $json.payload }}.

All Operations

Parameter	Type	Required	Default	Description
Max Concurrency	number	No	10	Maximum number of items to process concurrently.

Output Data

Every operation produces exactly one output item per input item. The result is merged into the item JSON at the top level, so the fields below sit alongside whatever the input item already carried; anything the result does not overwrite passes through unchanged, and binary data is forwarded.

Resource / Operation	Fields added to the output item
Bin / create	binId, nowTimestamp, nowIso, expiresTimestamp, expiresIso, requestUrl, viewUrl
Bin / get	The same set of fields as create, for the bin you asked about
Bin / delete	success (true) and binId — the ID that was deleted
Request / get	The captured request exactly as PostBin returns it
Request / removeFirst	The oldest captured request exactly as PostBin returns it — the request is removed from the bin in the process
Request / send	requestId — the ID PostBin assigned to the request that was just sent

Field notes for the bin operations:

• binId — the bin’s identifier, in {13 digits}-{13 digits} form. This is the value to feed the Bin ID parameter of later nodes.
• nowTimestamp / expiresTimestamp — the server’s current time and the bin’s expiry, in milliseconds.
• nowIso / expiresIso — the same two moments as ISO 8601 strings.
• requestUrl — the public URL that captures requests sent to the bin.
• viewUrl — the browser URL for inspecting the bin’s captured requests.

Reference the result downstream by expression, e.g. {{ $json.binId }}.

Usage Examples

• Create a new PostBin request bin
• Get details of an existing PostBin bin
• Delete a PostBin bin
• Send a test request to a PostBin bin
• Retrieve a specific captured request from a bin
• Remove and return the oldest request from a bin

Example Configuration

Create a new bin:

{
  "type": "postbin",
  "parameters": {
    "resource": "bin",
    "operation": "create"
  }
}

Look up an existing bin to check when it expires:

{
  "type": "postbin",
  "parameters": {
    "resource": "bin",
    "operation": "get",
    "binId": "1234567890123-1234567890123"
  }
}

Delete a bin — a full PostBin URL works just as well as a raw ID:

{
  "type": "postbin",
  "parameters": {
    "resource": "bin",
    "operation": "delete",
    "binId": "https://www.postb.in/1234567890123-1234567890123"
  }
}

Fetch one captured request by its ID:

{
  "type": "postbin",
  "parameters": {
    "resource": "request",
    "operation": "get",
    "binId": "1234567890123-1234567890123",
    "requestId": "req_abcd1234"
  }
}

Pop the oldest captured request off a bin:

{
  "type": "postbin",
  "parameters": {
    "resource": "request",
    "operation": "removeFirst",
    "binId": "1234567890123-1234567890123"
  }
}

Send a test request with a body:

{
  "type": "postbin",
  "parameters": {
    "resource": "request",
    "operation": "send",
    "binId": "1234567890123-1234567890123",
    "binContent": "Test webhook payload"
  }
}

Send a test request with no body at all:

{
  "type": "postbin",
  "parameters": {
    "resource": "request",
    "operation": "send",
    "binId": "1234567890123-1234567890123"
  }
}

Chain the nodes: send a test request to the bin the previous node created, reading its ID off the item:

{
  "type": "postbin",
  "parameters": {
    "resource": "request",
    "operation": "send",
    "binId": "{{ $json.binId }}",
    "binContent": "{{ $json.payload }}"
  }
}

Then read the request back to confirm it arrived:

{
  "type": "postbin",
  "parameters": {
    "resource": "request",
    "operation": "removeFirst",
    "binId": "{{ $json.binId }}"
  }
}

Error Handling

Mode	Behavior
stop	Halts workflow on first error
continue	Skips failed items, passes successful ones through
errorPort	Routes failed items to Error output port

Tips

Create temporary HTTP request bins, send test requests, and retrieve captured requests using the free PostBin (postb.in) service.