Build webhook JSON payloads for GitHub, Stripe, Slack, and custom services with schema templates.
Pick a provider and an event type, and the tool loads a JSON skeleton matching that event's documented fields, which you then edit through form inputs instead of raw JSON. It covers GitHub push/PR/issue events, Stripe event objects, Slack incoming-webhook messages, and a free-form custom schema builder. What people get wrong most often: the output is a shape reference with placeholder IDs and timestamps, not a live capture from their actual repo or account, and it carries no valid signature header.
A concrete input and expected output from the current implementation.
Input
Provider: Slack incoming webhook. Message text: "Deploy finished"
Expected output
{
"text": "Deploy finished"
} Slack's incoming webhook API accepts a minimal JSON body with just a "text" key for a basic message; the tool fills that template field with your text and omits optional keys like blocks or channel since none were supplied.
Choosing a provider and event or object type (e.g. GitHub 'pull_request opened', Stripe 'payment_intent.succeeded', Slack 'incoming webhook message') loads a JSON skeleton with placeholder values for the fields that event documents. Switching the event type swaps the whole skeleton rather than patching individual keys.
Form fields let you replace placeholder values (amounts, usernames, message text, repo names) and the tool re-renders the JSON with those substitutions while keeping the template's key order and nesting intact. The custom-service mode skips the provider templates entirely and lets you define arbitrary top-level keys and values.
No. The tool has no access to your signing secret, so it can't compute a valid HMAC and won't set a real signature header. Use it to test payload parsing and routing, then test signature verification separately with the provider's own tools, such as the Stripe CLI's trigger command or GitHub's webhook redelivery.
No. It fills in a local schema template with placeholder or manually entered values entirely in the browser; nothing is sent to or retrieved from GitHub, Stripe, or Slack.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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