API & MCP

Everything a person can do on Codeharbor Format & Check, a program or AI agent can do with the same inputs and get the identical result.

HTTP API

POST https://codeharborformat.usefulweb.site/api/v1/calculate – run Codeharbor Format & Check
GET https://codeharborformat.usefulweb.site/api/v1/tool – inputs, output schema, examples
OpenAPI 3.1: /openapi.json · /openapi.yaml
Errors: application/problem+json; 422 includes per-field errors.

Codeharbor Format & Check

Paste code to re-indent JSON, CSS or HTML and to list syntax problems with line and column: JSON is parsed strictly, YAML with a documented subset parser, JavaScript and TypeScript with Codeharbor’s own tokenizer. Nothing is run.

Inputs of Codeharbor Format & Check
Field	Type	Default	Description
`code`	textarea	—	Code. Paste the file content.
`language`	select (auto, json, css, html, yaml, javascript, typescript, markdown)	"auto"	Language
`fileName`	text	—	File name (optional). Used to pick the language when it is set to detect, e.g. config.yaml.
`indent`	select (2, 4)	"2"	Indentation

Example request

Pretty-print minified JSON

curl -X POST https://codeharborformat.usefulweb.site/api/v1/calculate -H 'content-type: application/json' -d '{"code":"{\"name\":\"harbour-api\",\"version\":\"1.4.0\",\"port\":8080,\"features\":{\"tides\":true,\"weather\":false},\"allowedOrigins\":[\"https://example.org\"]}","language":"json"}'

Every result contains

inputs (normalised, defaults applied), summary, result (validated against the published schema), units, assumptions, sources, warnings, computedAt and links.

MCP (Model Context Protocol)

Streamable HTTP endpoint: https://codeharborformat.usefulweb.site/mcp – protocol revisions 2026-07-28 (stateless) and 2025-11-25 / 2025-06-18 / 2025-03-26 (initialize handshake).
Tools: codeharbor_format
Local stdio connector: node src/mcp-stdio.ts --tool=codeharbor-format

{
  "mcpServers": {
    "codeharbor-format": { "type": "http", "url": "https://codeharborformat.usefulweb.site/mcp" }
  }
}