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brekkylab / backlot

A local emulator for enterprise SaaS APIs — Slack, Gmail, Google Drive, GitHub, Jira, Notion, S3 and more — with the real response shapes, pagination, auth and per-document ACLs, over a corpus you supply.

Why this job: works in the areas we cover, but does not say which job it does

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Your code on the left, calling the Slack and GitHub SDKs with only their base URL changed. In the middle, one local server on 127.0.0.1:8000, listing the services it answers as and the path prefix each is served under. On the right, the single SQLite corpus behind all of them.
Connecting Slack to an app, two ways, side by side. On the left, the real Slack API: create a workspace, register an app, add a bot user, pick OAuth scopes, register a redirect URL, install to the workspace — then wait on an admin to approve it, with still zero API calls made. On the right, Backlot: pip install backlot, backlot import --bundled, backlot serve, and one changed base URL, after which a conversations.history response comes back with the same fields, pagination and per-document ACLs. A day gone, against seconds. Then the same three commands with a different base URL for one source after another, Gmail, Google Drive, Microsoft Teams, GitHub and the rest, each answering a real request. Last, a write on the Slack base URL: chat.postMessage posts a message and conversations.history reads it back; then Backlot's own endpoints at the server root: /_meta/overlay reports what was written, /_meta/overlay/reset puts the corpus back, and the report is empty again.
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What it does

Backlot is a local emulator for Slack, Gmail, Google Drive, Microsoft Teams, GitHub, Jira, Notion, S3 and other enterprise APIs. It reproduces the response shapes, pagination, authentication, errors and per-document access controls an integration has to handle, over a deterministic corpus you control — so you build and test against the official vendor SDKs with no vendor account, no OAuth approval, no secrets in CI and no network.

Get started

No single install command. Read the steps in the README (opens in new tab)

Maintenance
Active
Last commit yesterday
Stars
224
+1 this week
Licence
Apache-2.0
Allows business use
Downloads for
None listed
No release files
Latest version
v0.1.1
Released 3 days ago
Built with
Python
99% of the code

Is it looked after?

Contributors
25
Last 90 days
Issues
77% closed
153 still open
Pull requests
570 merged
5 waiting
Releases
8
8 in the last year

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More: languages, topics and project record

Languages

  • Python 99%
  • TypeScript <1%
  • HTML <1%
  • JavaScript <1%

Topics

  • ai-agents
  • amazon-s3
  • api-mock
  • enterprise
  • fastapi
  • github
  • gmail
  • google-drive
  • jira
  • mcp
  • mock-server
  • notion

Project record

  • JobOther AI tools
  • StatusListed
  • Commits606
  • Forks83
  • Watching2
  • Stars in 28 days+14
  • CreatedJul 2, 2026
  • First seen by usNov 7, 2026
  • CheckedNov 12, 2026

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