Object Exists
Checks whether an object (file) exists in an Amazon S3 bucket.
Object Exists checks whether an object is in an Amazon S3 bucket and returns true or false. Use it before Get Object or Put Object to decide what the process does next.
Before you start
The AWS S3 actions don't use a stored credential. Each action has the same four connection fields:
| Field | Type | Required | What to put |
|---|---|---|---|
| Access Key | Text | Yes | The access key ID of an AWS IAM user, for example AKIAโฆ. |
| Secret Key | Text | Yes | The secret access key that belongs to that access key. |
| Region | Text | Yes | The AWS region of the bucket, as its code, for example eu-central-1. |
| Bucket | Text | Yes | The bucket name, for example my-company-invoices. |
The IAM user needs S3 permissions on the bucket for the operation you run. The values you type are visible to everyone who can edit the process, so prefer an IAM user limited to the buckets the process needs.
Add the action
In the Process Designer toolbox, open AWS S3 and pick Object Exists (or type Object Exists in the search box).
Inputs and outputs
| Field | Direction | Type | Required | What to put / what you get |
|---|---|---|---|---|
| Access Key, Secret Key, Region, Bucket | Input | Text | Yes | The connection fields described above. |
| Object Key | Input | Text | Yes | The full key of the object, including every prefix, for example invoices/2026/inv-001.pdf. |
| Result | Output | Boolean | Yes | true if the object exists, false if it doesn't. |
Example
Bucket my-company-invoices, Object Key invoices/2026/inv-001.pdf โ Result true when that object is in the bucket, false otherwise.
Good to know
- The key must be exact and complete:
inv-001.pdfdoesn't matchinvoices/2026/inv-001.pdf. Keys are case-sensitive. - A missing object returns
false; it doesn't fail the step. - If a connection field is empty, the step fails with "Invalid connection details."
- Common errors from S3: "Access forbidden! Ensure the connection details are valid." (wrong keys or missing permission), "Unable to connect! Ensure the provided region matches the bucket one." (wrong Region), and "Unrecognized Amazon Region: โฆ" (a region code that doesn't exist).