discord API error 50035: Invalid Form Body in embed fields

TL;DR

Discord rejected an embed field: too long, too many fields, or an invalid value. Error 50035 names the exact failing field path. Trim the value to Discord's embed limits, at most 1024 characters per field value, 256 per field name, 25 fields per embed, and resend.

Read the errors array. It tells you exactly which field broke.

Verbatim query

discord API error 50035: Invalid Form Body in embed fields

Steps

1. Read the 50035 errors array for the exact field path The response includes an errors object naming the failing field, like a specific index in the fields array. Expected: You know precisely which field failed and why.

2. Check the content against Discord's embed limits Field names max out at 256 characters, field values at 1024, 25 fields per embed, 10 embeds per message, 6000 characters total across all embeds. Expected: You can point at the exact limit that was exceeded.

3. Trim or split the offending content Truncate the value with an ellipsis marker, or split one long field into several shorter ones. Expected: Every field is within limits.

4. Resend the message Send the corrected payload to the same endpoint. Expected: A 200 response with the message object.

5. Add embed validation to the generated client Check lengths before sending so oversized content is trimmed locally with a clear log line. Expected: Future oversized embeds are trimmed before they reach Discord.

Use this when

• Discord returns 50035 mentioning embed fields, field values, or field names.
• A generated client pastes untruncated text into embeds.
• The same message works with short text and fails with long text.

Not for this skill when

• The 50035 is about a different part of the payload, like files or message content.
• The failure is a Discord 429 rate limit.
• The problem is webhook versus bot token authentication.

Variant phrasings

"Invalid Form Body" on embed.fields value

The errors array points at the value. Trim it.

BASETYPEBAD_LENGTH on embeds

Discord's name for a length violation. Same limits, same fix.

Why it happens

Discord enforces strict size limits on every part of an embed, and the limits are easy to exceed when a generated client forwards arbitrary text like error output or article bodies into embed fields. The client assumes the embed can hold any string; Discord disagrees at 1024 characters per field value.

Edge cases

• The 6000-character total across all embeds is the sneaky one: each field can be within limits while the message still fails.
• Empty field values are rejected; use a placeholder character if a field must exist.
• Markdown formatting counts toward the raw character limit, not the rendered length.
• Splitting a field mid-word can break formatting; split on sentence or line boundaries.
• Ten embeds per message is a separate cap from the per-embed field cap.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_MkOtabhyahOFM6eZm8fJPA