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YAML Parser

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  2. /JSON & Format Converters
  3. /YAML Parser

Related tools

YML

YAML Validator

Validate YAML syntax and identify structural or indentation errors.

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YAML Formatter & Beautifier

Beautify and format YAML documents with standardized indentation.

Yaml formatterBeautify yaml
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YAML Editor

Edit YAML files with a robust code editor featuring syntax highlighting and validation.

Yaml editorOnline yaml editor
YML{ }

YAML to JSON / JSON to YAML Converter

Bidirectional converter between YAML configuration and JSON data.

Yaml to jsonJson to yaml
YML

YAML Viewer

View and explore YAML data using a dedicated code viewer.

Yaml viewerYaml explorer
{ }YML

JSON to YAML Converter

Convert JSON data to clean YAML syntax with configurable indentation.

Json to yamlYaml converter

A YAML file that fails to parse usually fails somewhere other than where it looks wrong, which is why "check the indentation" is such unsatisfying advice. This YAML parser does a real parse and reports the exact line where the document stopped being valid, so you can go straight there. It catches the failures that cost the most time — a tab character used for indentation, sibling keys indented inconsistently, an unquoted value containing a colon, a missing space after a dash in a sequence — and it also shows you the parsed result, which is how you catch the quieter class of bug where the document parses fine but a value came out as a boolean or a number when you wanted a string. Parsing is done safely in your browser with no code execution and no upload, so testing a manifest full of secrets is safe.

Features

  • ✓Real parse with success or a precise failure line
  • ✓Detects tab indentation and inconsistent nesting
  • ✓Shows the parsed structure so you can verify value types
  • ✓Supports multi-document files, anchors, and aliases
  • ✓Safe parsing — no arbitrary code or tag execution
  • ✓Handles multi-line block and folded strings
  • ✓No signup, no upload, no size limit
  • ✓Entirely client-side

Why use this yaml parser?

  • Locates the failing line instead of guessing
  • Catches silent type coercion before deployment
  • Keeps secrets in the file on your own machine
  • Immediate feedback with no pipeline round-trip
  • Free and unlimited

Frequently asked questions

Why is my YAML invalid?

The most frequent causes are tab characters used for indentation (never allowed), inconsistent indentation between sibling keys, a missing space after a colon or dash, and unquoted values containing a colon followed by a space.

Why did my value become true or a number?

YAML infers types, so unquoted yes, no, on, off, true, false, and numeric-looking values are converted. Quote the value to keep it a string — this is the classic cause of a country code like NO becoming false.

Is parsing safe?

Yes. Parsing is done in safe mode, so custom tags cannot instantiate arbitrary objects or execute code. Only plain data structures are produced.

Does it handle multi-document YAML?

Yes. Documents separated by --- are each parsed, which is what Kubernetes manifests declaring several resources need.

What is the difference between a YAML parser and a validator?

Both confirm the syntax is correct. A validator may additionally check the document against a schema; a parser is concerned with whether it can be read at all.

Is my YAML uploaded?

No. Parsing happens entirely in your browser and the document is never transmitted or stored.