Developer / Debugging

MIME Type Lookup

Look up common MIME types by file extension or reverse-lookup extensions from a MIME value directly in your browser. Find the right `Content-Type` for an extension or reverse-lookup which file types commonly use a MIME value.

Matches

Top result

Loaded JSON example

Quick notes

Look up by extension like `.svg` or by MIME type like `application/json`.

Full filenames like `invoice.pdf` or `logo.final.svg` are accepted and the extension will be extracted automatically.

This is handy when you need upload validation, server headers, S3 metadata, or download responses.

Some MIME types map to more than one extension, so reverse lookups help spot alternatives.

Copy-ready `Content-Type` snippets save a trip back to old server configs or docs.

Extension or MIME type

Category filter

Primary match

Extension: .json

MIME: application/json

Category: Data

Use case: APIs, configs

Transfer: Usually safe as text payload

Category view

Data 2

Content-Type header

Content-Type: application/json

JSON preview

[
  {
    "extension": "json",
    "mimeType": "application/json",
    "category": "Data",
    "description": "JSON document",
    "commonUse": "APIs, configs"
  },
  {
    "extension": "map",
    "mimeType": "application/json",
    "category": "Data",
    "description": "Source map",
    "commonUse": "Build artifacts"
  }
]

accept attribute

.json,.map

Detected input mode

Extension-style lookup detected

Search seed: .json

Matched records

.json

application/json

Data

JSON document

APIs, configs

.map

application/json

Data

Source map

Build artifacts

Express snippet

res.setHeader("Content-Type", "application/json");

nginx types snippet

types {
  application/json json;
}

Practical signals

Reverse lookups are especially useful when one MIME type covers multiple file extensions and you need the one your app actually expects.

This kind of lookup keeps showing up in file-upload forms, API download endpoints, CDN metadata, and email attachment handling.

Extension-mode lookup is active, which is usually what people need while wiring up uploads or server headers.

Why this gets reused

Developers keep checking MIME types while building uploads, API responses, static asset routes, and storage metadata.

One correct `Content-Type` often fixes download behavior, preview rendering, or browser caching immediately.

Reverse lookup from MIME back to extensions makes the tool useful in both debugging and implementation work.

Strong first-use cases

Checking the right `Content-Type` for an uploaded or downloaded file.

Looking up which extensions belong to a MIME value returned by an API or CDN.

Copying a clean header line into server config, edge functions, or app code.