YAMLToolbox

YAMLToolbox

Fast, private, browser-based YAML tools. 100% free. No upload. No sign-up.

100% client-side — your data never leaves your browser. Built for Obsidian, Hugo, Jekyll, and CI pipelines.

Convert

YAML → JSON

Convert YAML into clean, readable JSON.

JSON → YAML

Turn JSON into indented, friendly YAML.

YAML → CSV

Flatten YAML lists into CSV.

CSV → YAML

Turn CSV rows into YAML records.

YAML → TSV

Export YAML as tab-separated values.

TSV → YAML

Import tab-separated data as YAML.

YAML → XML

Convert YAML into well-formed XML.

XML → YAML

Turn XML (with attributes) into YAML.

Validate & Format

YAML Validator

Check YAML syntax with clear errors.

YAML Formatter

Beautify and re-indent YAML.

YAML Minifier

Compress YAML to a compact form.

Frontmatter Validator & Fixer

Check the --- block in Obsidian / Hugo / Jekyll notes.

Encode

YAML → Base64

Encode YAML as a portable string.

Base64 → YAML

Decode and validate Base64 YAML.

YAML → URL

Percent-encode YAML for URLs.

URL → YAML

Decode URL strings back to YAML.

Guides

What is YAML? — a plain-language introduction.
YAML vs JSON — when to use each.
How to convert YAML to JSON — step by step.
YAML validation guide — common errors and fixes.
YAML indentation — spaces, tabs, and how to fix indentation errors.
Why use YAML over JSON? — comments, anchors, and multi-line strings.
How to convert JSON to YAML — step by step.
Convert YAML to JSON in Python — PyYAML examples.
YAML vs JSON vs XML — three formats compared.
YAML format example — annotated reference file.
Common YAML errors — what the messages mean and how to fix them.
YAML anchors & aliases — reuse values with & and *.
Obsidian YAML front matter — common errors and fixes.
YAML front matter guide — the --- block explained.
Hugo vs Jekyll front matter — how the two generators differ.
YAML frontmatter validator & fixer — check your note's --- block.
YAMLToolbox vs yamlchecker.com — privacy, front matter, and auto-fix compared.
YAML linter alternatives — yamllint, Prettier, and YAMLToolbox compared.
YAMLToolbox vs Prettier — browser validator vs project formatter.
Minify YAML for CI/CD — shrink configs for GitHub Actions.
CSV to YAML for Hugo — turn spreadsheets into data files.
XML to YAML migration — move Spring/K8s config over.
Team YAML style guide — format consistently across a repo.
Encode YAML for env & secrets — Base64 or URL-encode.

Why YAMLToolbox

Private by design. Everything runs in your browser. Files are never uploaded.
No sign-up, no clutter. Focused tools that just work.
Instant. Real-time conversion as you type.