Why convert YAML to JSON?

Most APIs accept JSON, not YAML. Converting lets you use YAML for human-friendly config authoring, then convert to JSON for API transmission, programmatic parsing, or storage. Common scenarios: reading a Kubernetes manifest in code, converting CI configs for processing, or transforming Docker Compose files for analysis.

Does the converter preserve all YAML features?

Most: scalars (strings, numbers, booleans, null), sequences (arrays), and mappings (objects) all convert cleanly. YAML-specific features like anchors (&), aliases (*), and merge keys (<<) are resolved during conversion — the JSON output contains the resolved values, not the references.

What about YAML comments?

JSON doesn't support comments, so YAML comments (lines starting with #) are stripped during conversion. If preserving comments matters, store them separately or use JSON5/JSONC formats which do support comments — though those aren't standard JSON.

Will it handle multi-document YAML files?

YAML files separated by '---' contain multiple documents. The converter outputs each as a JSON document; multi-doc YAML produces an array of JSON objects (or you can split into separate JSON files manually). Single-document YAML produces a single JSON value as expected.

What about complex types (dates, timestamps)?

YAML supports typed scalars including ISO 8601 dates and timestamps. Since JSON has no date type, these convert to strings. Date-aware applications should parse them as needed; the string format is preserved exactly. Numbers and booleans convert to their JSON equivalents.

Are large YAML files supported?

Yes — conversion happens entirely in your browser using a JavaScript YAML parser. Files up to several megabytes convert in milliseconds. For multi-gigabyte YAML (rare but possible with database dumps or massive configs), use command-line tools like yq for streaming conversion.

Is my data sent to a server?

No. All conversion happens in your browser. Your YAML never leaves your device — safe for confidential infrastructure configs, secrets-containing files (though secrets shouldn't be in files anyway), or any sensitive data.

YAML to JSON

Convert YAML to JSON format online instantly. Free YAML to JSON converter for parsing configuration and data files accurately.

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JSON to YAML

YAML Input

JSON Output

JSON output will appear here...

About YAML to JSON Converter

Convert YAML configuration files to JSON format. Supports nested objects, arrays, booleans, numbers, and special YAML values like null (~), yes/no, and on/off.

How to Use YAML to JSON

Paste your YAML

Paste your YAML configuration or document into the input editor on the left. Or click Upload to pick a .yaml/.yml file from disk.

View JSON output

The converted JSON appears instantly in the output panel. Comments are stripped (JSON doesn't support them), but structure, types, anchors, and aliases are preserved.

Adjust formatting (optional)

Choose 2-space, 4-space, or tab indentation for the JSON output. Most APIs and tools accept any well-formed JSON regardless of indent style.

Copy or download

Click Copy to put the JSON on your clipboard, or Download to save as a .json file. Use it in API requests, programmatic processing, or any JSON-consuming context.

When to Use YAML to JSON

Processing Kubernetes manifests programmatically

Kubernetes resources are typically authored in YAML but need to be processed (validated, transformed, generated) by code. Convert YAML manifests to JSON to manipulate with kubectl's --output=json, jq, or any JSON-aware tooling. Round-trip back to YAML for kubectl apply.

Reading CI/CD configs in build scripts

GitHub Actions, GitLab CI, CircleCI configs are YAML. To extract job names, validate triggers, or generate documentation from these configs, convert to JSON first — JSON parsers exist in every language and handle deeply nested structures cleanly.

Migrating from YAML APIs to JSON APIs

Some legacy services accept YAML (Ansible Tower, older config services) while new ones prefer JSON. Use this converter as a transformation layer when migrating between them or building bridge services that accept both formats.

Converting Helm chart values for templating

Helm chart values.yaml files drive complex templated deployments. Converting to JSON lets you process values with jq, validate schemas with JSON Schema validators, or generate documentation describing all available configuration options.

YAML to JSON Examples

Simple YAML conversion

Input

name: Alice
age: 30
skills:
  - JavaScript
  - TypeScript

Output

{
  "name": "Alice",
  "age": 30,
  "skills": [
    "JavaScript",
    "TypeScript"
  ]
}

Basic YAML mapping (name, age) becomes JSON object. The list (skills) becomes JSON array. Indentation in YAML maps to nesting in JSON. Numbers stay numbers, strings stay strings — types are preserved across formats.

Nested config

Input

server:
  host: localhost
  port: 8080
  cors:
    enabled: true
    origins:
      - https://app.com
      - https://admin.app.com

Output

{
  "server": {
    "host": "localhost",
    "port": 8080,
    "cors": {
      "enabled": true,
      "origins": [
        "https://app.com",
        "https://admin.app.com"
      ]
    }
  }
}

Nested YAML mappings become nested JSON objects. Each indentation level maps to one nesting level. Boolean (true) and arrays of strings convert correctly. The output is significantly more verbose than YAML — that's the cost of JSON's structure.

YAML anchors resolved

Input

defaults: &defaults
  retries: 3
  timeout: 30

production:
  <<: *defaults
  host: prod.com

staging:
  <<: *defaults
  host: staging.com

Output

{
  "defaults": { "retries": 3, "timeout": 30 },
  "production": { "retries": 3, "timeout": 30, "host": "prod.com" },
  "staging": { "retries": 3, "timeout": 30, "host": "staging.com" }
}

YAML anchors (&defaults) and aliases (<<: *defaults) are resolved during conversion. The JSON output contains the expanded values for each environment. This loses the DRY-ness of YAML but produces fully-qualified JSON that any parser can read without anchor support.

Tips & Best Practices for YAML to JSON

1.After converting, validate the JSON output with a JSON validator. Some YAML edge cases (very long strings, special chars) can produce JSON that needs verification.
2.Comments are lost during conversion. If your YAML has important documentation in comments, save it separately or convert to JSONC/JSON5 (which support comments) instead of standard JSON.
3.For round-trip workflows (YAML → JSON → YAML), be aware that idempotent conversion isn't guaranteed for all YAML features. Anchor resolution especially is one-way — the resolved JSON can't recreate the original anchors.
4.Numbers in YAML can be ambiguous (e.g., '01' might be an octal in YAML 1.1 but an error in 1.2). The converter follows YAML 1.2 rules. If you have unusual numbers, verify they convert as expected.
5.For Kubernetes manifests specifically, kubectl convert (between API versions) operates on JSON internally. This converter is useful for manual inspection but kubectl handles version migrations natively.
6.Multi-document YAML (separated by ---) becomes either an array of JSON objects or separate JSON files depending on the converter's mode. Check options before relying on a specific output structure.

Frequently Asked Questions

YAML (YAML Ain't Markup Language) is a human-readable data serialization format commonly used for configuration files (Docker Compose, Kubernetes, GitHub Actions, Ansible, Helm). It uses indentation to denote structure (instead of brackets like JSON), supports comments, and feels more natural to write by hand. YAML 1.2 is a superset of JSON — every JSON document is valid YAML.

YAML to JSON

About YAML to JSON Converter

How to Use YAML to JSON

Paste your YAML

View JSON output

Adjust formatting (optional)

Copy or download

When to Use YAML to JSON

Processing Kubernetes manifests programmatically

Reading CI/CD configs in build scripts

Migrating from YAML APIs to JSON APIs

Converting Helm chart values for templating

YAML to JSON Examples

Simple YAML conversion

Nested config

YAML anchors resolved

Tips & Best Practices for YAML to JSON

Frequently Asked Questions

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