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You integrate n8n with OpenClaw by treating OpenClaw as a normal external API service: register and configure the OpenClaw skill(s) in ClawHub, provision credentials (OAuth client or API key/service account) in your OpenClaw/ClawHub org, then build n8n workflows that obtain and store tokens securely, call OpenClaw’s HTTP endpoints (to invoke skills or agents), and receive callbacks via n8n webhooks. Keep long-running or stateful work outside the agent runtime (use external stores/queues), validate webhook signatures, and debug by inspecting HTTP responses, logs, and credential scopes.
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<b>//</b> Exchange client credentials for a token
curl -X POST "{OPENCLAW_OAUTH_TOKEN_URL}" \
-H "Content-Type: application/x-www-form-urlencoded" \
-d "grant_type=client_credentials&scope={SPACE_SEPARATED_SCOPES}" \
-u "{CLIENT_ID}:{CLIENT_SECRET}"
// Expected response (JSON):
{
"access_token": "eyJhbGciOi...",
"token_type": "Bearer",
"expires_in": 3600,
"scope": "{scopes}"
}
<b>//</b> Call the skill invocation endpoint; adjust path/payload per your ClawHub docs
curl -X POST "{OPENCLAW_API_BASE}/skills/{SKILL_ID}/invocations" \
-H "Authorization: Bearer {ACCESS_TOKEN}" \
-H "Content-Type: application/json" \
-d '{
"input": {
"text": "Summarize the latest sales report"
},
"metadata": {
"requestId": "n8n-1234"
}
}'
<b>//</b> Node.js example: verify HMAC-SHA256 signature
const crypto = require('crypto');
function verifySignature(rawBody, headerSignature, secret) {
const hmac = crypto.createHmac('sha256', secret);
hmac.update(rawBody);
const expected = hmac.digest('hex');
// Use constant-time compare in production
return crypto.timingSafeEqual(Buffer.from(expected), Buffer.from(headerSignature));
}
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1
Create an API key in OpenClaw (ClawHub or your OpenClaw admin), then store that key as an n8n credential and select it in the OpenClaw node. Confirm which header OpenClaw expects (commonly Authorization: Bearer <KEY> or x-api-key) and use that credential for node requests.
// example if header is Authorization: Bearer
fetch('https://api.openclaw.example/agents', {
headers: { 'Authorization': 'Bearer YOUR_KEY' }
})
2
Direct answer: Configure the n8n Webhook node to accept OpenClaw webhooks, then add a Function node that reads the raw request body and the signature header (name set in your OpenClaw webhook settings), compute an HMAC using the shared secret from an environment variable, and compare using a constant-time check; reject if verification fails.
Key actions:
// n8n Function node
const crypto = require('crypto');
// header name set in OpenClaw config
const sig = $json["headers"]["x-claw-signature"];
const secret = process.env.OPENCLAW_WEBHOOK_SECRET;
// rawBody provided by n8n as binary or JSON string
const body = items[0].binary ? items[0].binary.body.data.toString() : JSON.stringify(items[0].json);
const expected = crypto.createHmac('sha256', secret).update(body).digest('hex');
// constant-time compare
if (!crypto.timingSafeEqual(Buffer.from(expected), Buffer.from(sig))) {
throw new Error('Invalid signature');
}
return items;
3
Map OpenClaw event JSON into n8n by ingesting the event via an n8n Webhook/HTTP trigger, validating the signature, then using a Set node or a Function node to extract canonical fields (id, type, timestamp, actor, payload) into n8n’s item.json. Handle nested arrays with SplitInBatches or map in JS, persist raw JSON for debugging, and surface errors for retries.
// Function node example
return items.map(item => {
const e = item.json.event || item.json; // adapt to schema
return { json: {
id: e.id,
type: e.type,
ts: e.timestamp || e.created_at,
actor: e.actor || null,
payload: e.payload || e.data,
raw: item.json
}};
});
4
Short answer: inspect the 429 response headers (especially Retry-After), log the full response, then throttle and retry requests from your n8n workflow using exponential backoff with jitter or explicit waits (SplitInBatches + Wait). Detect 429s in the workflow, pause, and requeue or retry; monitor quotas and reduce concurrency.
Practical actions:
// Function node: compute wait seconds
const ra = $json["responseHeaders"] && $json["responseHeaders"]["retry-after"];
let wait = ra ? parseInt(ra,10) : Math.min(60, Math.pow(2, attempt) + Math.random()*3);
// return wait seconds
return { waitSeconds: wait };
This prompt helps an AI assistant understand your setup and guide you through the fix step by step, without assuming technical knowledge.
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