lokalise-webhooks-events

Implement Lokalise webhook handling and event processing. Use when setting up webhook endpoints, handling translation events, or building automation based on Lokalise notifications. Trigger with phrases like "lokalise webhook", "lokalise events", "lokalise notifications", "handle lokalise events", "lokalise automation".

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Last source activity: August 19, 2026 at 12:13
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name	lokalise-webhooks-events
description	Implement Lokalise webhook handling and event processing. Use when setting up webhook endpoints, handling translation events, or building automation based on Lokalise notifications. Trigger with phrases like "lokalise webhook", "lokalise events", "lokalise notifications", "handle lokalise events", "lokalise automation".
allowed-tools	Read, Write, Edit, Bash(curl:*)
version	1.14.0
license	MIT
author	Jeremy Longshore <jeremy@intentsolutions.io>
tags	["saas","lokalise","webhooks"]
compatibility	Designed for Claude Code

Lokalise Webhooks Events

Overview

Lokalise webhooks push real-time notifications to your endpoint when translation events occur — keys created, translations updated, files uploaded, contributors added. This skill covers creating webhooks via the API, handling each event type, verifying webhook secrets, and routing events to appropriate handlers.

Prerequisites

Lokalise project with admin or manager role (required for webhook creation)
HTTPS endpoint accessible from the internet (Lokalise rejects HTTP URLs)
Express.js or equivalent HTTP framework
Webhook secret for payload verification (generated during webhook creation)

Instructions

1. Create a Webhook via the API

Register your endpoint with Lokalise using POST /projects/{project_id}/webhooks:

curl -X POST "https://api.lokalise.com/api2/projects/${PROJECT_ID}/webhooks" \
  -H "X-Api-Token: ${LOKALISE_API_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{
    "url": "https://your-app.example.com/webhooks/lokalise",
    "branch": "main",
    "events": [
      "project.key.added",
      "project.key.modified",
      "project.translation.updated",
      "project.translation.proofread",
      "project.imported",
      "project.exported",
      "project.contributor.added",
      "project.contributor.deleted"
    ],
    "event_lang_map": [
      {"event": "project.translation.updated", "lang_iso_codes": ["en", "fr", "de"]}
    ]
  }'

The response includes a secret field — store this securely. You need it to verify incoming payloads.

To scope webhooks to specific languages, use event_lang_map. This prevents noise from languages you do not manage.

2. Know the Event Types

Event	Fires When	Key Payload Fields
`project.key.added`	New key created	`key.key_id`, `key.key_name`, `key.platforms`
`project.key.modified`	Key name, tags, or metadata changed	`key.key_id`, `key.key_name`, `key.modifications`

{
  "event": "project.translation.updated",
  "project": {
    "id": "123456789.abcdefgh",
    "name": "My Project"
  },
  "user": {
    "email": "translator@example.com",
    "full_name": "Jane Translator"
  },
  "language": {
    "lang_id": 640,
    "lang_iso": "fr",
    "lang_name": "French"
  },
  "translation": {
    "translation_id": 98765,
    "key_id": 11223,
    "value": "Bonjour le monde",
    "is_reviewed": false,
    "modified_at": "2026-03-19T10:30:00Z"
  },
  "created_at": "2026-03-19T10:30:01Z"
}

import express from "express";
import type { Request, Response, NextFunction } from "express";

const app = express();
const WEBHOOK_SECRET = process.env.LOKALISE_WEBHOOK_SECRET!;

// Parse raw body for signature verification
app.use("/webhooks/lokalise", express.json());

// Verify webhook secret
function verifyLokaliseSecret(
  req: Request,
  res: Response,
  next: NextFunction
): void {
  const secret = req.headers["x-secret"] as string;

  if (!secret || secret !== WEBHOOK_SECRET) {
    console.error("Webhook signature verification failed");
    res.status(401).json({ error: "Invalid webhook secret" });
    return;
  }
  next();
}

app.post(
  "/webhooks/lokalise",
  verifyLokaliseSecret,
  async (req: Request, res: Response) => {
    // Respond immediately — Lokalise times out after 8 seconds
    res.status(200).json({ received: true });

    // Process asynchronously
    try {
      await routeEvent(req.body);
    } catch (error) {
      console.error("Webhook processing failed:", error);
    }
  }
);

interface LokaliseWebhookPayload {
  event: string;
  project: { id: string; name: string };
  user: { email: string; full_name: string };
  language?: { lang_iso: string; lang_name: string };
  key?: { key_id: number; key_name: string; platforms: string[] };
  translation?: {
    translation_id: number;
    value: string;
    is_reviewed: boolean;
  };
  import?: { filename: string; format: string };
  contributor?: { email: string; role: string };
  created_at: string;
}

type EventHandler = (payload: LokaliseWebhookPayload) => Promise<void>;

const eventHandlers: Record<string, EventHandler> = {
  "project.key.added": async (payload) => {
    console.log(`New key: ${payload.key!.key_name}`);
    // Notify translators, update local cache, trigger CI
  },

  "project.translation.updated": async (payload) => {
    const { translation, language } = payload;
    console.log(
      `Translation updated [${language!.lang_iso}]: ${translation!.value}`
    );
    // Trigger rebuild, invalidate CDN cache, update OTA bundle
  },

  "project.imported": async (payload) => {
    console.log(`File imported: ${payload.import!.filename}`);
    // Kick off translation memory update, notify reviewers
  },

  "project.contributor.added": async (payload) => {
    console.log(`New contributor: ${payload.contributor!.email}`);
    // Send onboarding info, assign default language pairs
  },
};

async function routeEvent(payload: LokaliseWebhookPayload): Promise<void> {
  const handler = eventHandlers[payload.event];
  if (handler) {
    await handler(payload);
  } else {
    console.log(`Unhandled event type: ${payload.event}`);
  }
}

const processedEvents = new Set<string>();

async function routeEventIdempotent(
  payload: LokaliseWebhookPayload
): Promise<void> {
  // Create a unique key from event + timestamp + relevant IDs
  const eventKey = `${payload.event}:${payload.created_at}:` +
    `${payload.translation?.translation_id ?? payload.key?.key_id ?? ""}`;

  if (processedEvents.has(eventKey)) {
    console.log(`Duplicate event skipped: ${eventKey}`);
    return;
  }

  processedEvents.add(eventKey);
  // For production: use Redis SET with TTL instead of in-memory Set
  // await redis.set(`webhook:${eventKey}`, "1", "EX", 86400);

  await routeEvent(payload);
}

Issue	Cause	Solution
Invalid signature	Wrong secret or secret rotated	Re-check `LOKALISE_WEBHOOK_SECRET` against Lokalise project settings
Timeout (8 seconds)	Synchronous processing too slow	Respond 200 immediately, process in background
Duplicate events	Lokalise retried after network issue	Implement idempotency with event key deduplication
Missing events	Event type not subscribed	Update webhook via `PUT /projects/{id}/webhooks/{webhook_id}`
Webhook disabled	Too many consecutive failures	Check Lokalise dashboard; webhook auto-disables after repeated errors

curl -X GET "https://api.lokalise.com/api2/projects/${PROJECT_ID}/webhooks" \
  -H "X-Api-Token: ${LOKALISE_API_TOKEN}"

curl -X PUT "https://api.lokalise.com/api2/projects/${PROJECT_ID}/webhooks/${WEBHOOK_ID}" \
  -H "X-Api-Token: ${LOKALISE_API_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{
    "events": [
      "project.translation.updated",
      "project.translation.proofread",
      "project.imported"
    ]
  }'

curl -X DELETE "https://api.lokalise.com/api2/projects/${PROJECT_ID}/webhooks/${WEBHOOK_ID}" \
  -H "X-Api-Token: ${LOKALISE_API_TOKEN}"

# Terminal 1: Start your server
npm run dev  # Express on port 3000

# Terminal 2: Expose via ngrok
ngrok http 3000

# Use the ngrok HTTPS URL when creating the webhook:
# https://abc123.ngrok-free.app/webhooks/lokalise