I’ve been working with Zapier integration in my app and ran into a weird issue. Everything worked fine initially and I had several working Zaps pulling data successfully.
Recently when I tried setting up a new Zap, it stopped functioning. Zapier support said the issue is with my ID field containing unwanted characters:
\ufeff{"user_id":"45"}
Anyone know how to fix this? When I check the same endpoint using Postman, everything looks normal without any strange characters showing up.
This BOM issue pops up when your dev environment and production server have different encoding settings. I’ve seen this tons of times - code works perfectly locally, then breaks after deployment. Usually happens because your text editor saves files with BOM encoding, which gets dumped into the HTTP response. Check your server config and make sure all source files are UTF-8 without BOM. With PHP, json_encode() will include BOM if your script files have it. You can temporarily fix it by adding trim() or ltrim() with the BOM character before outputting JSON, but you really need to fix the file encoding settings.
The \ufeff character is a Byte Order Mark (BOM) that’s sneaking into your JSON response. I encountered this issue before with similar integrations. Postman hides the BOM, so everything appears normal there, but it disrupts Zapier. You must ensure your backend uses UTF-8 encoding without the BOM. If you’re using Node.js, verify you’re not reading files with BOM or using fs.writeFileSync with incorrect encoding parameters. In other languages, check your HTTP response headers to confirm they’re set to UTF-8 without BOM. I resolved my issue by explicitly setting the Content-Type header to application/json; charset=utf-8 and adjusting how I generated the JSON response. It’s also worth considering if this issue arose after any recent API modifications.
had this exact problem last month! the bom character is super annoying and zapier really hates it. check if your server’s adding it when generating responses - happens with certain text editors or when copying code. quick fix: strip it out before sending the json back.