What is Markdown AST?

AST stands for Abstract Syntax Tree. It represents the structure of your Markdown document as a tree of nodes, which is useful for building custom renderers or analyzers.

What does Frontmatter mode extract?

Frontmatter mode reads the metadata block at the top of a Markdown file—delimited by --- for YAML or +++ for TOML—and returns its key-value pairs as a JSON object, ignoring the document body.

How are Markdown tables converted to JSON?

In Tables mode, each Markdown table is parsed into a JSON array where the header row becomes object keys and every subsequent row becomes an object of column values.

Is my Markdown sent to a server?

No. All conversion runs entirely in your browser. Your Markdown content and uploaded files never leave your device.

Which JSON output should I use?

Use AST for programmatic analysis or custom rendering, Frontmatter to pull out document metadata, and Tables when you only need the tabular data as structured records.

Convert Markdown to JSON Online | Free & Secure

Convert Markdown to JSON online, extracting the AST, frontmatter, and tables from your files. Secure client-side parsing with no upload required.

Paste your Markdown and this tool instantly converts it into structured JSON—outputting a full Abstract Syntax Tree (AST) of every node, the YAML or TOML frontmatter as a JSON object, or your Markdown tables as arrays of records. Choose AST, Frontmatter, or Tables mode; parsing runs entirely in your browser with no file upload.

Markdown Input

Upload

SampleUploadConvertClear

JSON Output

Result

JSON Formatter

CopyDownload

Result

Key Features

AST Conversion

Convert Markdown to a full Abstract Syntax Tree (AST) for programmatic analysis.

Frontmatter Extraction

Easily extract YAML/TOML frontmatter metadata as a JSON object.

Table Parsing

Automatically convert Markdown tables into structured JSON arrays.

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How to Convert Markdown to JSON

1
Paste or upload your Markdown
Enter Markdown content into the input field or upload a .md file to load it directly.
2
Choose a conversion mode
Select AST for the full syntax tree, Frontmatter to extract YAML/TOML metadata, or Tables to pull tables into JSON arrays.
3
Click Convert
The parser processes your Markdown and renders the structured JSON in the output panel.
4
Copy or download
Use Copy to grab the JSON for your clipboard or Download to save it as a .json file.

References

CommonMark Specification
The standardized, unambiguous syntax specification for Markdown that defines how documents are parsed into structure.
RFC 8259 — JSON
The IETF specification for the JSON data interchange format used in this tool's output.

Related Tools

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Parse rendered HTML structure into a JSON tree.

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Turn tabular CSV data into structured JSON arrays.

Frequently Asked Questions

What is Markdown AST?: AST stands for Abstract Syntax Tree. It represents the structure of your Markdown document as a tree of nodes, which is useful for building custom renderers or analyzers.
What does Frontmatter mode extract?: Frontmatter mode reads the metadata block at the top of a Markdown file—delimited by --- for YAML or +++ for TOML—and returns its key-value pairs as a JSON object, ignoring the document body.
How are Markdown tables converted to JSON?: In Tables mode, each Markdown table is parsed into a JSON array where the header row becomes object keys and every subsequent row becomes an object of column values.
Is my Markdown sent to a server?: No. All conversion runs entirely in your browser. Your Markdown content and uploaded files never leave your device.
Which JSON output should I use?: Use AST for programmatic analysis or custom rendering, Frontmatter to pull out document metadata, and Tables when you only need the tabular data as structured records.