YAML Prettifier - Beautify and Format YAML Online

Raw YAML Input

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YAML Prettifier Guide

Prettify, beautify and inspect YAML online

This YAML Prettifier is built for developers who need to turn compressed API responses, logs, configuration files or copied YAML strings into readable data. Paste raw YAML into the left editor, choose your indentation style, then format it into clean output with line numbers and syntax highlighting.

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Readable indentation

Pretty print YAML using 1, 2 or 3 spaces, a real tab character, or compact output when you need a smaller payload.

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Debug API data

Use the line-numbered editors to inspect nested objects, arrays, booleans, null values, numbers and strings without losing your place.

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Browser-based formatting

Formatting happens in your browser. Your YAML is not submitted to devbruh.dev just to beautify or compact it.

What is YAML?

YAML, short for JavaScript Object Notation, is a lightweight data format used to exchange structured information between clients, servers, scripts and applications. A YAML document is made from objects, arrays, strings, numbers, booleans and null values, which makes it easy for both people and programs to read.

Although YAML grew out of JavaScript, it is language independent. JavaScript, Python, PHP, Ruby, Java, Go and many other languages can generate and parse YAML. That is why it is common in REST APIs, GraphQL responses, webhooks, package files, settings files and logs.

Minified YAML saves bandwidth, but it is hard to debug. A YAML beautifier expands the data with line breaks and indentation so you can understand structure, compare fields and spot syntax problems faster.

Common YAML formatting use cases

API response formatting: Pretty print compact responses from REST APIs, webhooks and backend services so objects and arrays are easier to inspect.

YAML linting: Check whether pasted YAML can be parsed. If parsing fails, the tool shows an invalid YAML message instead of returning misleading output.

Configuration cleanup: Reformat package files, app settings, test fixtures and mock data before sharing them with teammates.

Compact payloads: Choose compact mode when you need valid YAML without extra whitespace for storage, transmission or embedding.

YAML example

Try a small insurance-company style object like this, or use the larger built-in sample button above.

insuranceCompanies:
  topCompanies:
    - rank: 1
      name: Berkshire Hathaway
      marketCapitalization: $308 billion
  source: example.com
  updated: 2026-05-29

Related YAML tools

After formatting YAML, you may also want to validate, minify, inspect or convert it.

YAML Validator YAML Minifier YAML Highlighter YAML XML

YAML Formatter FAQ

What does this YAML Formatter do?

It parses YAML text and converts it into readable output with selectable indentation, line numbers and syntax highlighting. It is useful for debugging minified YAML, API responses, logs and configuration files.

Is my YAML data saved?

No. This formatter runs in your browser and does not send YAML input to a server for formatting. Avoid pasting secrets into any online tool unless you are comfortable with the environment you are using.

Which YAML specification should I care about?

For most modern projects, valid YAML should follow YAML 1.2 syntax. Use consistent indentation, avoid tabs for indentation in production YAML, and quote strings when they could be confused with booleans, numbers or null values.

Can I compact YAML here?

Yes. Use the Tabs selector and choose Compact. The formatter will remove unnecessary spaces and line breaks while keeping the YAML valid.

Does this replace a full YAML validator?

It checks whether YAML can be parsed before formatting. For a dedicated validation workflow, use the YAML Validator.

Learn more about YAML

If you are learning YAML or checking compatibility, these references are useful starting points.

yaml.org YAML 1.2 Spec js-yaml