Is this a full YAML 1.2 implementation?

No. The parser targets common config-style YAML: nested mappings, block sequences with “-”, scalars (quoted or plain), booleans, null, and numbers. Anchors, aliases, tags, merge keys, multi-line block scalars, and flow collections beyond simple cases are not supported.

Why does valid YAML fail here but work in another tool?

Different parsers accept different subsets. Features like tabs for indentation, complex flow-only documents, or YAML-specific escapes may not be implemented. When in doubt, simplify structure (use spaces for indent, prefer block maps and lists) or use a dedicated library in your stack.

Does my YAML or JSON get uploaded?

No. Parsing, validation, formatting, and conversion run entirely in your browser. Your data stays on your device.

What does Validate do versus the live output?

Validate runs the same parse as conversion and shows a short success message when the input is syntactically acceptable for this subset. The output panel still updates live so you can see JSON or YAML as you type when parsing succeeds.

What is the input size limit?

Input is capped at five hundred thousand characters to avoid locking up the tab. Split very large manifests or logs before pasting them here.

Free YAML to JSON & JSON to YAML Converter Online

YAML ↔ JSON

Direction:YAML → JSONJSON → YAML

YAML input0 chars

JSON output

Subset YAML parser (maps, lists, scalars, nesting). Anchors, merges, and multi-line scalars are not supported. Input is capped at 500,000 characters. Everything runs in your browser.

Related Tools

JSON Editor

Format, minify, and repair JSON after converting from YAML or before exporting to YAML.

Text Diff Checker

Compare two config snippets or API payloads line by line when configs change.

HTML Tools

Jump to the HTML editor and preview tools when you are also juggling markup alongside config files.

Why convert YAML and JSON?

YAML is common in Kubernetes manifests, CI pipelines, and Ansible-style configs because it is readable for humans. JSON is the lingua franca of REST APIs and browser-native data. Teams often need both: edit YAML by hand, then paste JSON into an API client, or reverse the flow when importing samples into a YAML-first repo.

This page helps you translate between the two shapes quickly, with validation and formatting so you catch structural mistakes before they reach production.

How to use this tool

Choose YAML → JSON or JSON → YAML with the direction radios.
Paste or type in the input pane. Valid conversions appear in the output pane on the right.
Click Validate to confirm the current input parses under this tool’s rules.
Use Format to pretty-print YAML (via parse and reserialize) or JSON (standard two-space indent).
Copy output sends the result to your clipboard; Swap direction flips modes without losing your saved inputs per side.

Supported YAML subset

Mappings with key: value and nested blocks using deeper indentation (spaces).
Sequences with - item, including list items that are nested objects when continuation lines are indented further.
Scalars: quoted strings, plain words, integers and floats, booleans, and null-style tokens where recognized.
Line comments starting with # on value fragments are stripped in many scalar positions—avoid putting # inside unquoted values.

Workflow tips

When debugging APIs, paste JSON responses into JSON → YAML mode to read nested payloads with less brace noise. When preparing kubectl or Compose snippets, start in YAML → JSON to feed the same data into tools that only accept JSON bodies.

For heavier JSON work, open the dedicated JSON editor for repair helpers and minify/expand options alongside this converter.

Frequently asked questions about YAML conversion

Why convert YAML and JSON?

This page helps you translate between the two shapes quickly, with validation and formatting so you catch structural mistakes before they reach production.

How to use this tool

Choose YAML → JSON or JSON → YAML with the direction radios.

Paste or type in the input pane. Valid conversions appear in the output pane on the right.

Click Validate to confirm the current input parses under this tool’s rules.

Use Format to pretty-print YAML (via parse and reserialize) or JSON (standard two-space indent).

Copy output sends the result to your clipboard; Swap direction flips modes without losing your saved inputs per side.

Supported YAML subset

Mappings with key: value and nested blocks using deeper indentation (spaces).

Sequences with - item, including list items that are nested objects when continuation lines are indented further.

Scalars: quoted strings, plain words, integers and floats, booleans, and null-style tokens where recognized.

Line comments starting with # on value fragments are stripped in many scalar positions—avoid putting # inside unquoted values.

Workflow tips

For heavier JSON work, open the dedicated JSON editor for repair helpers and minify/expand options alongside this converter.