Webhook Signature Validator

Verify webhook signatures against payload and secret

Use Webhook Signature Validator

Input and output check

Webhook Signature Validator

Start from the sample input, then inspect the output panes, diagnostics, and structured mapping view before you copy any artifact into production tooling.

Runtime summary

Preparing output

Signature compare
Diagnostics

Output details

Output review

Review these checks before copying generated output into a request, fixture, client, or support note.

Expected digest

Start with expected digest to confirm the workbench is modeling the same input surface you are debugging.

Match status

The output pane keeps match status visible so you can compare the raw input with the derived artifact.

Canonical input trace

Use canonical input trace as the final review pass before shipping the output into a terminal, database, or API client.

Output review rule

Check timestamp usage, algorithm selection, and signature encoding before assuming the shared secret is wrong.

Sample input to try

Use the raw webhook body exactly as received, the signing secret, selected HMAC algorithm, and the received signature header.

Expected output review

Compare expected and received signatures while checking timestamp prefixes, body bytes, and hex or Base64 encoding.

Real debugging sample
Payload:
{"id":"evt_1001","type":"invoice.paid","amount":24875}
Secret: whsec_demo
Algorithm: HMAC-SHA256

Expected header:
sha256=02161ce54f748b1ee4d4e6faf5c6e90a50fb854858e7de60e7b9b52de5f4082b
Common errors to check
  • Formatting JSON before verification and changing the signed byte sequence.
  • Comparing a header that includes sha256= against a bare digest without normalizing.
  • Using the production secret against a staging event or ignoring timestamp prefixes.
Next checks
  • Generate the same digest in HMAC Generator to compare algorithm and encoding.
  • Parse request headers to confirm which signature field the provider sent.
  • Validate JSON only after signature checks preserve the raw body.
  • Inspect JWT claims separately when the event also carries bearer tokens.
Local processing: Signature checks are local, but webhook bodies and secrets are sensitive; use test secrets and redact event data before sharing.
HMAC GeneratorRecompute HMAC values with visible encoding.HMAC Header GeneratorBuild canonical request signing headers.HTTP Header ParserReview received signature and timestamp headers.JSON Request ValidatorCheck event JSON after preserving raw body bytes.JWT DecoderInspect token claims carried with webhook tests.

Built for integrators validating event authenticity before handlers acknowledge webhook deliveries. Use this workbench for recomputing a signature from payload and secret to compare with the received header value, then read the diagnostics before copying the artifact into a client, config, import job, or support note.

Audience
integrators validating event authenticity before handlers acknowledge webhook deliveries
Primary artifact
an expected-versus-received signature report
Caveat
Webhook validation often depends on the untouched request body bytes, so copy-paste payloads can still differ from production delivery.
Privacy
Browser-only input, no upload step, copy-ready output.
Expected digestMatch statusCanonical input trace

Request workflow and diagnostics

How The Workbench Is Structured

1. Raw input stays visible

The calculator keeps the original input close to the generated artifact so you can spot transformation drift before you copy anything forward.

2. Diagnostics sit beside output

Each tool pairs the generated output with concise warnings or checks so you do not need to interpret a raw string in isolation.

3. Mapping beats guesswork

The mapping panel highlights the pieces that matter for handoff: headers, query keys, columns, claims, chunk sizes, or file signatures.

The summary panel highlights the request, payload, token, or generated artifact that matters most for this workflow.

How To Use This Developer Workbench

Where Webhook Signature Validator Fits In The Workflow

Webhook Signature Validator is built for integrators validating event authenticity before handlers acknowledge webhook deliveries. The page treats the task as a workbench, not a single conversion box, so the output stays explainable when you hand it to another engineer or paste it into docs.

Inside API & HTTP, the focus is recomputing a signature from payload and secret to compare with the received header value. That is why the page keeps the original input visible alongside the derived artifact and diagnostics.

  • Expected digest
  • Match status
  • Canonical input trace

How To Prepare Inputs

Paste the raw payload exactly as delivered and avoid reformatting JSON before validation.

If you are debugging a live issue, start with the exact value captured from logs, docs, or traces before making cleanup edits. That makes the before-and-after result more trustworthy.

Checks Before You Ship The Result

Check timestamp usage, algorithm selection, and signature encoding before assuming the shared secret is wrong.

Webhook validation often depends on the untouched request body bytes, so copy-paste payloads can still differ from production delivery.

Request checks before copying output

Questions about this developer tool

What does Webhook Signature Validator produce?

Webhook Signature Validator is tuned for recomputing a signature from payload and secret to compare with the received header value. The main output is an expected-versus-received signature report, supported by diagnostics and a mapping view so you can review the transport or data shape before using it elsewhere.

What input shape works best for Webhook Signature Validator?

Paste the raw payload exactly as delivered and avoid reformatting JSON before validation.

What should I verify before using the output in production?

Check timestamp usage, algorithm selection, and signature encoding before assuming the shared secret is wrong. Webhook validation often depends on the untouched request body bytes, so copy-paste payloads can still differ from production delivery.

Developer references and workflow assets

References