I’m currently trying to implement the OAuth process for Miro in my project and I’ve hit a major roadblock. I’ve completed the initial steps - creating the application and getting user permissions. Now, I’m on the step where I need to swap the authorization code for an access token.
Unfortunately, every attempt I make to send the POST request for the access token ends up with a 401 unauthorized error. I’ve checked my client ID, client secret, and the authorization code several times, and everything appears to be in order. Yet, something isn’t functioning as it should.
Has anyone dealt with a similar issue regarding Miro’s OAuth integration? I’m unsure if I’m overlooking something in the request headers or if there might be an issue with how long the authorization code is valid.
I would greatly appreciate any help, as I’m really at a standstill right now.
OAuth flows are a nightmare when you’re handling encoding, timing, and headers manually. Been there with Miro integrations.
401s usually mean: expired auth codes (they expire quick), botched encoding, or wrong headers. But debugging OAuth manually? It’s like catching smoke.
I quit fighting these API auth headaches and switched to automation for OAuth flows. Instead of coding token exchanges, parameter encoding, and error handling myself, I built the whole Miro OAuth process as an automated workflow.
The workflow handles token exchanges automatically, fixes encoding issues, sets correct headers, and manages token refreshes. No more 401s from timing problems or broken requests. You get proper error handling and logging too.
Saves hours of debugging and actually works consistently. Check it out: https://latenode.com
Had this exact Miro OAuth headache for weeks on a recent project. Turned out to be a scope issue. I was requesting scopes that weren’t enabled in my app settings. User would grant permission, but the token exchange kept failing with 401 - backend rejected the scope mismatch. Check your app config and make sure every scope you’re requesting is actually turned on. Some scopes need Miro’s approval before they work in production too. Another thing - if you’re in dev mode, verify your app status supports the OAuth flow you’re using. Miro’s error messages suck at telling you what type of auth failure you’re actually getting.
Had this exact problem last month. It’s usually encoding issues with the authorization code. When the code gets passed through URL redirects, special characters get double-encoded or corrupted. URL-decode the authorization code before sending it to the token exchange request. Double-check you’re hitting the right endpoint - https://api.miro.com/v1/oauth/token. Also caught me off guard: wrong Content-Type header. Set it to application/x-www-form-urlencoded, not application/json. These little things fixed it for me.
check your grant_type parameter - needs to be ‘authorization_code’. also, miro wants basic auth in the header with base64 encoded clientid:clientsecret, not in the request body. tripped me up when I first used their oauth too
Had this exact problem six months ago during a client integration. The 401 drove me crazy until I figured out my request structure was wrong. Miro needs the code parameter exactly as received - don’t modify it at all. I was trimming whitespace and that broke everything. Another thing that’ll bite you: if you used a state parameter in your auth request, you’ve got to include the same value when exchanging for the token. Also check your OAuth settings in the Miro developer console. Sometimes teammates change redirect URIs or regenerate secrets without telling anyone. The auth code should work right after you get it, so if you’re still getting 401s with a fresh code, make sure your POST body format matches their docs exactly.
I hit this same issue with Miro’s API. The auth code expires super fast - like 10 minutes. If you wait too long to exchange it for an access token, you’ll get that 401 error. Double-check that your redirect URI matches exactly what’s in your Miro app settings. Also, make sure you’re sending the client ID and secret in the request body as form data, not headers - Miro’s picky about this. Try generating a fresh auth code and exchanging it right away to see if that fixes it.