Extracts front matter from strings. Adapted from jxson/front-matter.

Supported formats

JSON

import { test } from "https://deno.land/std@0.224.0/front_matter/test.ts";
import { extract } from "https://deno.land/std@0.224.0/front_matter/json.ts";

const str = "---json\n{\"and\": \"this\"}\n---\ndeno is awesome";
const result = extract(str);

test(str); // true
result.frontMatter; // "{\"and\": \"this\"}"
result.body; // "deno is awesome"
result.attrs; // { and: "this" }

extractJson | extract and test support the following delimiters.

---json
{
  "and": "this"
}
---

{
  "is": "JSON"
}

TOML

import { test } from "https://deno.land/std@0.224.0/front_matter/test.ts";
import { extract } from "https://deno.land/std@0.224.0/front_matter/toml.ts";

const str = "---toml\nmodule = 'front_matter'\n---\ndeno is awesome";
const result = extract(str);

test(str); // true
result.frontMatter; // "module = 'front_matter'"
result.body; // "deno is awesome"
result.attrs; // { module: "front_matter" }

extractToml | extract and test support the following delimiters.

---toml
this = 'is'
---

= toml =
parsed = 'as'
toml = 'data'
= toml =

+++
is = 'that'
not = 'cool?'
+++

YAML

import { test } from "https://deno.land/std@0.224.0/front_matter/test.ts";
import { extract } from "https://deno.land/std@0.224.0/front_matter/yaml.ts";

const str = "---yaml\nmodule: front_matter\n---\ndeno is awesome";
const result = extract(str);

test(str); // true
result.frontMatter; // "module: front_matter"
result.body; // "deno is awesome"
result.attrs; // { module: "front_matter" }

extractYaml | extract and test support the following delimiters.

---
these: are
---

---yaml
all: recognized
---

= yaml =
as: yaml
= yaml =