---
title: "Format, minify and validate HTML."
method: POST
path: "/api/v1/html"
tags: ["Formatters & Validators"]
---

# Format, minify and validate HTML.

`POST /api/v1/html`

## Request

- Base URL: `https://programmes.net`
- URL: `https://programmes.net/api/v1/html`
- Auth: none declared

HTML Formatter. Operations: `format` — Pretty-print HTML. `minify` — Minify HTML (strip comments and collapse whitespace). `validate` — Check HTML for unclosed/mismatched tags.

## Request body

- union
  - HtmlFormat: Pretty-print HTML.
    - `operation` 'format', required
    - `input` string: The HTML to format.
    - `options` object
      - `indentSize` integer: Indent width in spaces.
      - `wrapAttributes` boolean: Put each attribute on its own line.
      - `preserveInline` boolean: Keep inline elements on one line.
  - HtmlMinify: Minify HTML (strip comments and collapse whitespace).
    - `operation` 'minify', required
    - `input` string: The HTML to minify.
    - `options` object
  - HtmlValidate: Check HTML for unclosed/mismatched tags.
    - `operation` 'validate', required
    - `input` string: The HTML to validate.
    - `options` object

## Response `200`

The operation ran.

- object
  - `ok` unknown, required
  - `tool` 'html', required
  - `operation` 'format' | 'minify' | 'validate', required
  - `result` unknown, required

## Other responses

- `400`: The request is not valid (https://programmes.net/api#invalid-request); The tool has no such operation (https://programmes.net/api#unknown-operation)
- `404`: No such tool (https://programmes.net/api#unknown-tool)
- `413`: The request or its input is too large (https://programmes.net/api#content-too-large)
- `415`: The body must be JSON (https://programmes.net/api#unsupported-media-type)
- `422`: An option is missing, of the wrong type or out of range (https://programmes.net/api#invalid-options); This call needs more CPU than one API call may use (https://programmes.net/api#refused); The operation could not process the input (https://programmes.net/api#tool-error)
- `429`: Too many requests (https://programmes.net/api#rate-limited)
- `500`: Internal error (https://programmes.net/api#internal-error)

---

[API](https://skmtc.dev/programmes/apis/programmes-net-api.md) · [All operations](https://skmtc.dev/programmes/apis/programmes-net-api/llms.txt) · [OpenAPI document](https://skmtc.dev/programmes/apis/programmes-net-api/revisions/aa939784a2e6?raw)