Test message payloads, debug embed formatting, and inspect error responses before they hit your Discord channel. See exactly what Discord returns.
Discord's webhook API looks simple until you hit the edge cases. These are the issues developers run into most.
Discord returns HTTP 400 with error code 50035 but the message doesn't tell you which field failed. An empty string in an embed field name, a hex color instead of a decimal integer, or exceeding the 6,000-character total embed limit all produce the same cryptic error.
You send {"embed": {...}} or {"embeds": {...}} and the message posts but the embed is missing. The field must be "embeds" (plural) and it must be an array: {"embeds": [{...}]}. Missing square brackets cause silent failure with no error.
Discord's documented limit is 5 requests per 2 seconds, but you get 429s even when X-RateLimit-Remaining says you have capacity. Webhooks in the same guild may share a rate limit bucket, and aggressive 429s trigger Cloudflare IP bans.
Forget to set Content-Type: application/json and Discord returns a 400 or ignores your payload entirely. The error message never mentions the missing header. Common when using cURL or fetch without explicit headers.
Discord has no sandbox mode, no payload validator, and no dry run option. Every test sends a real message to a real channel. You either clutter a test channel or use external tools to validate your payload structure first.
Sending files means switching from application/json to multipart/form-data and stuffing your JSON payload into a payload_json field. File parameters need unique names and Content-Disposition must include a filename parameter.
Pre-configured for Discord with POST + JSON and a sample message payload. Start testing the moment you install.
Craft your webhook JSON payload, send it, and see the exact response Discord returns. Catch Invalid Form Body errors before they hit your production bot.
Opens with POST method, JSON body type, and a sample {"content": "Hello, world!"} payload. Your webhook URL placeholder shows the Discord format so you know exactly what to paste.
View the complete response body with JSON syntax highlighting. Discord error responses include nested error details that are impossible to read in a terminal but easy to scan with color-coded formatting.
Paste cURL commands from Discord documentation or Stack Overflow answers and they auto-convert to a ready-to-send request. Export your working request as cURL to share.
Your last 100 requests are saved automatically. Search and restore previous payloads with one click. Perfect for iterating on complex embed structures without starting over.
Set Content-Type, Authorization, and any custom headers. Switch between JSON, text, and form-encoded body types. The extension auto-sets Content-Type based on your body selection.
Add Discord Webhook Tester to Chrome from the Web Store. Free, no credit card.
Copy your Discord webhook URL (discord.com/api/webhooks/...) and paste it in. A sample message payload is already filled in.
Edit the JSON payload, hit Send, and see the full response. Iterate on embeds and message formatting until it works.
Stop guessing at embed structures and payload formats. Test your Discord webhooks, inspect the full response, and iterate until it works.
