asynkr

EVENT-DRIVEN TESTING, MADE EASY

Test event-driven AWS systems without losing your mind.

Compose payloads with JSONata and Faker.js, fire them at real EventBridge buses, SQS queues, Lambda functions, and SNS topics, and see exactly what happened. All from one native app.

Download the free beta

macOS · Windows · Linux

🔒 SSO runs locally — your credentials never leave your machine.

Asynkr app — event collections, payload editor, and target panel

THE PROBLEM

Right now, testing an event chain means five browser tabs and a folder of curl scripts.

×Rewriting the same curl command for the tenth time this week

×Bouncing between AWS consoles to see if anything arrived

×Losing track of which payload you actually sent an hour ago

×No history, no replay, no single place to keep your test events

WHAT IT DOES

Built for the AWS event-driven stack

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One place for every event collection

No more digging through the AWS console to find the event you tested last week.

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JSONata templating

Build dynamic payloads with real expressions, not copy-pasting.

ƒx

Faker.js built in

Generate realistic fake data on the fly instead of hardcoding the same three test users.

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Multi-account & SSO

Switch between AWS profiles and SSO sessions without re-authenticating every time.

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Send history & replay

Every send is logged. Replay any payload to any target in one click.

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One window, not ten tabs

No more switching between browsers and consoles just to send one test event.

TARGETING

Point a payload at a real target and see exactly where it went.

Pick an EventBridge bus, Lambda function, SQS queue, or SNS topic as the destination, preview the resolved payload, and check the history tab to confirm what actually got sent — no console tab required.

Asynkr JSONata and Faker.js payload templating

PAYLOADS

Write $faker.person.firstName(), not "John Doe" for the hundredth time.

Drop JSONata expressions straight into your payload and preview the resolved output before you send — UUIDs, timestamps, and realistic fake data generated on the fly, no copy-pasting from a spreadsheet.

HISTORY

Every send, logged. Nothing disappears into a console tab.

See which event bus got hit, which detail type fired, and how long ago — then replay any of it with one click instead of rebuilding the payload from scratch.

FAQ

Common questions

Is Asynkr free?

Yes — free during the beta. There's no pricing tier yet; right now we're focused on feedback from engineers who deal with this daily, not monetizing early.

What AWS permissions does it need?

Only what your own AWS profile or SSO session already grants. Asynkr doesn't request any special access — it just calls the services you target (EventBridge, SQS, Lambda, SNS) using your existing credentials.

Does my data ever leave my machine?

No. Asynkr is a native app — SSO authentication and every AWS call happen locally, straight from your machine to AWS. Your credentials and payloads never pass through our servers.

Which AWS services are supported?

EventBridge, SQS, Lambda, and SNS today, with more targets on the way.

Can I use multiple AWS accounts or SSO profiles?

Yes — switch between AWS profiles and SSO sessions without re-authenticating each time.

Free during beta.

No pricing tiers yet — just feedback from engineers who deal with this daily.

Download the beta now!Get in touch

macOS · Windows · Linux

asynkr