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DevCodivo

YAML to JSON

Convert YAML to JSON with clear errors that point to the exact line.

Runs in your browser — your data never leaves your deviceFree, no sign-up
Options
JSON output

The converted JSON will appear here.

How it works

The input is parsed by a full YAML 1.2 parser (the yaml package — the same parser used by major tooling), which resolves anchors, aliases, merge keys, block scalars and type tags. The resulting value is then serialized as JSON with your chosen indentation.

Invalid input produces an error with the exact line and column where parsing failed.

Features

  • Full YAML 1.2 parser — flow and block styles, anchors, merges
  • Errors reported with line and column
  • 2 or 4 space JSON indentation
  • Copy, download and upload actions
  • 100% client-side — nothing leaves your browser

How to use

  1. Paste YAML, or upload a .yaml/.yml file.
  2. Choose 2 or 4 space indentation.
  3. Press Convert to JSON, then copy the result or download it as a .json file.

Example

YAML:
name: deployment
replicas: 4
labels:
  env: production

JSON:
{
  "name": "deployment",
  "replicas": 4,
  "labels": {
    "env": "production"
  }
}

Frequently asked questions

Does the conversion preserve the exact data?
For data — mappings, sequences, strings, numbers, booleans and null — yes: the JSON output parses back to the same structure. YAML-specific extras like anchors, aliases, merge keys and multi-document files (---) are resolved or handled where possible, but comments in the YAML cannot be represented in JSON and are dropped.
What YAML features are supported?
The parser is a full YAML 1.2 implementation (the yaml package): block and flow styles, quoted and plain scalars, multiline block scalars (| and >), comments, anchors and aliases, merge keys, null/bool/int/float types, and dates (converted to their string form).
What happens if my YAML is invalid?
You get a clear error message with the line and column where parsing failed, plus the parser's reason — for example bad indentation or an unclosed quote. Nothing is converted until the input parses.
Why convert YAML to JSON?
Many APIs, deployment tools and policy engines accept JSON only. Converting a Kubernetes manifest, CI config or any YAML file to JSON lets you feed it to tools that expect JSON, inspect it in a JSON viewer, or include it directly in an API request body.
Can I choose the indentation of the JSON output?
Yes — 2 or 4 spaces. Two spaces is the most common style; pick four if your project conventions require it.
Is my data sent to a server?
No. Conversion happens entirely in your browser with JavaScript. Nothing you type or paste is transmitted anywhere — you can verify this in your browser's network inspector.

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