YAML to JSON Converter

Parse YAML configs into strict JSON. Free in your browser — no sign-up, no watermarks.

Drop your YAML files here

or click to browse — Select multiple files for batch conversion

yamlyml

⚡ Instant — conversion starts the moment you add files. No sign-up, no watermarks. Why FileHugger

🔍 How your file is processed
Runs
In your browser on this page
Engine
In-browser JavaScript converters with no external libraries (XML parsing uses the browser's built-in DOMParser)
Max input
512 MB per file (or paste text directly)
Your file
Processed in this browser tab — the file is not uploaded. Converted results are kept in this browser's local storage for up to two hours so their matching download page can show them; expired results are removed on the next site visit. Nothing is stored on our servers.
Good to know
Format limits apply: nested JSON values are embedded as JSON text inside a single CSV cell (not expanded into columns), and CSV values are always imported as text — no number or boolean detection is attempted.

Full security & file-privacy details →

Or paste your YAML content directly:

Related converters

CSV to PDFWord to MarkdownMarkdown to WordHTML to MarkdownTranslate MarkdownTranslate Text File

How to convert YAML to JSON

  1. Click Choose files (or drag & drop) and select one or more YAML files. You can also paste the input text directly into the box below the uploader.
  2. Review the options (delimiter is auto-detected for CSV) — usually the defaults are exactly right.
  3. Press Convert to JSON. Each file is converted with a live progress indicator.
  4. Open the download page to save your files individually or grab everything as a single ZIP.

Why convert YAML to JSON?

Need to feed a YAML config to a tool that only reads JSON, or debug what a YAML file actually contains? This converter parses standard YAML documents — nested maps, lists, multi-line strings — and outputs precise, pretty-printed JSON.

Advertisement

What this tool preserves — and what it changes

✓ Preserved

  • The everyday config subset: block maps and lists at any depth, quoted and plain scalars, inline [ ] { } flow style, and | / > block scalars
  • YAML typing: unquoted true/false become real booleans, numbers become numbers, ~ and null become JSON null — while quoted values stay strings

↺ Changed

  • Comments are dropped — JSON has nowhere to put them
  • Document markers (--- and ...) are stripped; the tool is built for single-document files
  • However the YAML was indented, the output is normalized to pretty-printed JSON with a uniform 2-space indent

Known limits & edge cases

  • Anchors, aliases (& / *) and tags (!) are refused with an error naming the line, and % directives are refused outright — never silently mis-parsed
  • Unquoted yes/no/on/off stay strings, as in YAML 1.2 — only true/false become booleans
  • Bad indentation and unterminated quotes are reported with the exact line number, so large configs are quick to fix

Engine: In-browser JavaScript converters with no external libraries (XML parsing uses the browser's built-in DOMParser). These statements describe the engine as shipped on 2026-10-02 — behaviour changes are recorded in the changelog.

About the formats

What is a YAML file?

YAML is a human-friendly data format built around indentation instead of brackets. It dominates DevOps: Docker Compose, Kubernetes, GitHub Actions and most CI/CD pipelines are configured in YAML. It represents the same data model as JSON, so converting between the two is lossless for typical documents — handy when a tool wants one and you have the other.

What is a JSON file?

JSON is the standard data format of the modern web. APIs, config files and databases exchange structured data as JSON because it is human-readable, supports nesting, and maps directly to objects in every programming language. Converting between JSON and CSV, XML or YAML is everyday work for developers, analysts and anyone wiring two systems together.

YAML vs JSON at a glance

YAMLJSON
TypeStructured dataStructured data
CompressionTextText
Typical useDevOps configs, CI/CD, KubernetesAPIs, configuration, data exchange

From human config to strict machine input

YAML is pleasant to write and maddening to debug — a stray tab or a subtle indent breaks a deploy at parse time. Converting to JSON does two jobs at once: it validates the YAML (parse errors surface here, in seconds, instead of in your pipeline) and produces the strict format required by APIs, JavaScript tooling and every system that speaks JSON only.

It also answers the everyday question “what does this config actually contain?” — JSON’s explicit brackets leave no ambiguity about nesting and types, which is exactly where YAML’s minimalism hides surprises (the classic: an unquoted no parsing as boolean false). Round-tripping through the JSON→YAML tool next door means you can move between the write-friendly and machine-strict forms freely, whichever direction the day requires.

Frequently asked questions

Is this YAML to JSON converter free?

Yes — completely free, with no sign-up, no watermarks and no daily quota. Processing happens in this browser, so the practical limit is the memory available on your device.

Can I convert multiple YAML files at once?

Yes. Select or drop as many files as you like — each one is converted in sequence with its own progress status, and you can download the results individually or all together as a ZIP archive.

Which YAML features are supported?

Standard documents: nested mappings and lists, quoted and plain scalars, inline [] and {} collections, comments, and | / > block scalars. Exotic features like anchors, aliases and custom tags are rejected with a clear error instead of producing wrong output.

Advertisement