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YAML to JSON

Convert one YAML 1.2 core document to JSON with string-key enforcement, safe-number checks, bounded aliases and clear conversion-loss warnings.

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Built around the job you need to finish

Convert reviewed data, not YAML presentation; comments and alias identity are not part of JSON.

API integrator

Convert one YAML 1.2 core document to JSON with string-key enforcement, safe-number checks, bounded aliases and clear conversion-loss warnings.

Convert nested arrays, block strings and scalar roots, then compare the JSON values with the target schema.

Receives matching JSON data or an explicit refusal, never a guessed partial object.

Data reviewer

Why are some valid YAML documents refused?

Test numeric keys, exact identifiers and alias cycles; make explicit data policies before conversion.

JSON requires string keys and has no cyclic references, NaN or Infinity. Unsafe integers, precision-sensitive decimals and excessive alias expansion are refused.

Keyboard or mobile user

Complete the task with native controls and readable responsive result/error states.

Edit YAML, run conversion, review loss warnings and copy the read-only JSON result.

Named controls expose current result state without pointer-only interactions or silent stale output.

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Reference & details

How it works

Method and boundary

Convert reviewed data, not YAML presentation; comments and alias identity are not part of JSON.

Why are some valid YAML documents refused?

JSON requires string keys and has no cyclic references, NaN or Infinity. Unsafe integers, precision-sensitive decimals and excessive alias expansion are refused.

Which YAML version is used?

Only YAML 1.2 core. Unquoted on/off remain strings. YAML 1.1 directives, unknown tags and merge keys are rejected rather than guessed.

Updated: August 2026

Example Scenarios

Convert nested arrays, block strings and scalar roots, then compare the JSON values with the target schema.

Test numeric keys, exact identifiers and alias cycles; make explicit data policies before conversion.

Edit YAML, run conversion, review loss warnings and copy the read-only JSON result.

FAQ

JSON requires string keys and has no cyclic references, NaN or Infinity. Unsafe integers, precision-sensitive decimals and excessive alias expansion are refused.

Only YAML 1.2 core. Unquoted on/off remain strings. YAML 1.1 directives, unknown tags and merge keys are rejected rather than guessed.

Input is limited to 200,000 characters, 50 nesting levels and 10,000 nodes; conversion output is capped at 500,000 characters. Reduce oversized documents explicitly.

This panel keeps input in browser memory without automatic history. Copying transfers output to your clipboard. YAML Formatter can explicitly save bounded source and results to a local Project. Avoid secrets.

About YAML to JSON

Convert reviewed data, not YAML presentation; comments and alias identity are not part of JSON.