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MIME Types cheat sheet

Content-Type values for APIs, uploads, browsers, and static files.

Quick lookup

application/jsonCheck exact spelling, casing, and the platform documentation for this field.
text/htmlCheck exact spelling, casing, and the platform documentation for this field.
text/plainCheck exact spelling, casing, and the platform documentation for this field.
text/csvCheck exact spelling, casing, and the platform documentation for this field.
image/svg+xmlCheck exact spelling, casing, and the platform documentation for this field.
application/pdfCheck exact spelling, casing, and the platform documentation for this field.
application/zipCheck exact spelling, casing, and the platform documentation for this field.
multipart/form-dataCheck exact spelling, casing, and the platform documentation for this field.

Common mistakes

  • Debugging the client before checking the raw request and response
  • Ignoring headers that explain cache, auth, or rate limits
  • Treating browser CORS failures as generic API downtime
  • Logging tokens or webhook secrets while troubleshooting

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