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JSON to YAML Converter

Code

Convert JSON to YAML instantly — paste your JSON and get clean, properly indented YAML output. Runs entirely in your browser, nothing uploaded or stored.

What is a JSON→YAML?

A JSON to YAML Converter takes data formatted in JSON — the format most APIs and JavaScript applications use natively — and rewrites it as YAML, the format preferred by most configuration-driven tools like Docker Compose, Kubernetes manifests, and CI/CD pipeline definitions. Both formats represent the exact same kinds of data: objects, arrays, strings, numbers, and booleans. The difference is purely syntactic — YAML relies on indentation instead of braces and brackets, which most developers find easier to scan and hand-edit.

This converter handles that syntax translation instantly. Paste in JSON exported from an API response, a database, or a JavaScript object, and get clean, properly indented YAML ready to drop into a config file. For the reverse direction, use the YAML to JSON Converter, and for cleaning up existing YAML without changing its source format, use the YAML Formatter.

How to use this JSON→YAML calculator

  1. Paste your JSON data into the JSON Input field.
  2. Choose your preferred Indent Size — 2 spaces or 4 spaces.
  3. Read the converted result in the YAML Output panel — it updates automatically.
  4. If you see a "JSON parse error" message, check your input for missing commas, unmatched brackets, or trailing commas.
  5. Copy the YAML output using the copy button.
  6. Paste it directly into your .yaml or .yml configuration file.

Formula & Methodology

The converter parses the input as JSON, then serialises the resulting data structure using YAML syntax rules — indentation for nesting, no trailing commas, and unquoted strings where YAML allows it.

Before (JSON):
json {   "name": "thecalcu.com",   "categories": ["investment", "loan", "tax"],   "published": true } 

After (YAML):
yaml name: thecalcu.com categories:   - investment   - loan   - tax published: true 

No values are altered during conversion — only the syntax used to represent the same structure changes.

Frequently Asked Questions

JSON uses curly braces, square brackets, and quotation marks to structure data, while YAML uses indentation and line breaks to represent the same structure with far less punctuation. Both represent the same underlying data — objects, arrays, strings, numbers, and booleans — but YAML is generally easier for humans to read and edit by hand.
Many configuration systems — including Docker Compose, Kubernetes, GitHub Actions, and Ansible — use YAML as their native format, even though the underlying data might originate as JSON from an API or database export. Converting JSON to YAML lets you take that data and drop it directly into a YAML-based config file.
No — JSON and YAML can represent the same data structures, so converting in either direction is lossless as long as the original JSON is syntactically valid. The values, types, and nesting structure remain identical; only the formatting syntax changes.
Paste your JSON into the input box, choose your preferred indent size, and the YAML output appears instantly in the result panel. No need to click a convert button — the output updates as you type or paste.
The Indent Size option sets how many spaces are used for each level of nesting in the output YAML — 2 spaces is the most common convention, while some teams and style guides prefer 4 spaces for readability. Pick whichever matches your project's existing YAML files.
The converter will show a JSON parse error message describing what went wrong, instead of producing incorrect output. Check for common issues like missing commas, unmatched brackets, or trailing commas, which are valid in some languages but not in strict JSON.
No — the conversion happens entirely in your browser using JavaScript. Your JSON and the resulting YAML are never sent to a server or stored anywhere.
The [YAML Formatter](/yaml-formatter/) takes existing YAML and re-formats or beautifies it, while this tool converts JSON into YAML from scratch. If you already have YAML that just needs cleaning up, use the YAML Formatter instead.
Yes — use the companion [YAML to JSON Converter](/yaml-to-json-formatter/) to convert in the opposite direction, taking YAML input and producing formatted JSON output.
Yes — any valid JSON structure, including deeply nested objects, arrays of objects, and mixed data types, converts correctly to the equivalent YAML structure with proper indentation at each level.
Also known as
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