Content-Type Header Generator
Generate Content-Type headers for JSON, HTML, XML, and multipart forms.
Syntax Checker & Code Validator
About Content-Type Header Generator
The HTTP `Content-Type` Header Builder creates valid MIME type and character encoding header strings (`Content-Type: application/json; charset=utf-8`, `multipart/form-data; boundary=...`) for REST APIs, static web servers, and Postman testing.
How to Use Content-Type Header Generator
Step 1
Select your media format preset or type a custom MIME type.
Step 2
Choose character encoding charset (default: `utf-8`).
Step 3
Review the formatted `Content-Type` header and server code snippets.
Step 4
Click "Copy Header".
Practical Use Cases for Content-Type Header Generator
Configuring REST API & Webhook Response Headers
Generate exact `Content-Type` headers for JSON APIs (`application/json; charset=utf-8`), XML endpoints, and CSV downloads.
Multipart Form & Boundary Header Formatting
Generate `multipart/form-data; boundary=----WebKitFormBoundary...` header declarations for custom HTTP client payloads.
Input & Output Examples
Generating JSON Content-Type Header
Format: JSON, Charset: UTF-8
`Content-Type: application/json; charset=utf-8`
Key Features & Performance
- ✓Presets for 50+ common web media types (JSON, HTML, CSV, XML, PDF, WebP, AVIF, WebAssembly, SSE `text/event-stream`).
- ✓Configurable Charset (`utf-8`, `iso-8859-1`, `windows-1252`) and custom parameters.
- ✓Generates code snippets for Express.js (`res.setHeader()`), Next.js Response, and curl CLI headers.
- ✓100% Client-Side memory execution.
- ✓1-Click Copy header snippet.
Key Terminology & Definitions
`Content-Type` Header
An HTTP header used to indicate the original media type and character encoding of the resource before any encoding for transmission.
Multipart Boundary
A unique delimiter string specified in the `Content-Type` header separating individual parts of a `multipart/form-data` payload.