Dataset Join & Merge

io.github.Nero-Engine/dataset-join-mergeVersion 0.1.0

Join two lists of JSON rows on a key, like SQL or VLOOKUP: left, inner, full, anti joins, union.

Status

Responds144 msNov 14, 2026, 14:40 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 14:40 UTC
Latency: 144 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 22:14 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://dataset-join-merge.nerolabs.workers.dev/mcpResponds144 msNov 14, 2026, 14:40 UTC

No sign-in

Claude Code

claude mcp add --transport http dataset-join-merge https://dataset-join-merge.nerolabs.workers.dev/mcp

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: dataset-join-merge
Remote MCP server URL: https://dataset-join-merge.nerolabs.workers.dev/mcp

Cursor

{
  "mcpServers": {
    "dataset-join-merge": {
      "url": "https://dataset-join-merge.nerolabs.workers.dev/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"dataset-join-merge","type":"http","url":"https://dataset-join-merge.nerolabs.workers.dev/mcp"}'

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Tools

2 tools

Tools of Dataset Join & Merge
	Description		Read-only	Idempotent	Open world
`join_rows`Joins two lists of JSON rows on a shared key, like a SQL join or a spreadsheet VLOOKUP, and returns the combined rows plus a summary: how many rows matched on each side, match rates, and warnings for duplicate keys, rows missing the key and key fields that exist on no row. Use it to enrich a list with fields from a lookup table (left join), keep only the overlap (inner), combine two sources into one table (full), find rows in one list that are missing from the other (leftAnti or rightAnti), or stack two same-shape lists (union). Keys match case-insensitively with whitespace trimmed by default, and the key can have a different name on each side (email on the left, contact_email on the right). Input and output rows are capped per call; a many-to-many join that would exceed the output cap is refused with the predicted row count, never truncated. Call list_capabilities for the exact limits.	Joins two lists of JSON rows on a shared key, like a SQL join or a spreadsheet VLOOKUP, and returns the combined rows plus a summary: how many rows matched on each side, match rates, and warnings for duplicate keys, rows missing the key and key fields that exist on no row. Use it to enrich a list with fields from a lookup table (left join), keep only the overlap (inner), combine two sources into one table (full), find rows in one list that are missing from the other (leftAnti or rightAnti), or stack two same-shape lists (union). Keys match case-insensitively with whitespace trimmed by default, and the key can have a different name on each side (email on the left, contact_email on the right). Input and output rows are capped per call; a many-to-many join that would exceed the output cap is refused with the predicted row count, never truncated. Call list_capabilities for the exact limits.	Not declared	Not declared	Not declared	Not declared
`list_capabilities`Returns every join type, key matching mode, conflict strategy and fan-out mode this server supports, the fields it adds to each row, and the input and output row limits per call. Free, processes no data.	Returns every join type, key matching mode, conflict strategy and fan-out mode this server supports, the fields it adds to each row, and the input and output row limits per call. Free, processes no data.	Not declared	Not declared	Not declared	Not declared

Details

Registry status: Active
Published: Sep 13, 2026
Updated: Sep 13, 2026
Website: https://github.com/Nero-Engine/dataset-join-merge-mcp⁠ (opens in a new tab)
Repository: https://github.com/Nero-Engine/dataset-join-merge-mcp⁠ (opens in a new tab)
Categories (suggested): Data and analyticsSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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