Compare lists and identify common items & differences using custom keys
This workflow compares two lists of objects (List A and List B) using a user-specified key (e.g. email, id, domain) and returns: - Items common to both lists (based on the key) - Items only in List A - Items only in List B How it works: 1. Accepts a JSON input containing: - listA: the first list of items - listB: the second list of items - key: the field name to use for comparison 2. Performs a field-based comparison using the specified key 3. Returns a structured output: - common: items wit
At a glance
Compare lists and identify common items & differences using custom keys is a ready-made n8n workflow you import as a workflow JSON file — no build required. It connects UNSUPPORTED_SLUG_FORMAT. It's free to download. Follow the 5-step import below to go live in minutes.
- Platform
- n8n
- Connects
- UNSUPPORTED_SLUG_FORMAT
- Modules
- 6
- Price
- Free
- Version
- v1.0

About this workflow
This workflow compares two lists of objects (List A and List B) using a user-specified key (e.g. email, id, domain) and returns: - Items common to both lists (based on the key) - Items only in List A - Items only in List B How it works: 1. Accepts a JSON input containing: - listA: the first list of items - listB: the second list of items - key: the field name to use for comparison 2. Performs a field-based comparison using the specified key 3. Returns a structured output: - common: items with matching keys (only one version retained) - onlyInA: items found only in List A - onlyInB: items found only in List B Example Input: Output: - common: [ { "email": "bob@example.com", "name": "Bob" } ] - onlyInA: [ { "email": "alice@example.com", "name": "Alice" } ] - onlyInB: [ { "email": "carol@example.com", "name": "Carol" } ] Use Cases: - Deduplicate data between two sources - Find overlapping records - Identify new or missing entries across systems This workflow is useful for internal data auditing, list reconciliation, transaction reconciliation, or pre-processing sync jobs.
How to import this n8n workflow
- 1
Download the workflow JSON file after purchase.
- 2
Open n8n → click the menu → Import from File.
- 3
Select the downloaded JSON and import.
- 4
Set up credentials for each node that requires them.
- 5
Click Execute Workflow to test, then activate.
Setup guide
Setup guide included
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