Paste YAML on the left, get clean, valid JSON on the right. Runs entirely in your browser — nothing is uploaded.
Turn this JSON into a live mock REST API you can call from your app — and make it fail on purpose to test your error handling.
Mock this as a live APIPaste or type your YAML, click Convert to JSON, and copy the result. The converter uses a standard YAML 1.1/1.2 parser, so anchors, nested maps, and lists all convert correctly. Everything happens locally in your browser — your data never leaves your machine.
No. The conversion runs entirely client-side in your browser. Nothing is uploaded or stored.
Standard YAML including nested mappings, sequences, multi-line strings, and anchors/aliases. Invalid YAML shows a clear error message pointing at the problem.
Yes — that's what makes RestSimulator different. Hit "Mock this as a live API" and your JSON becomes a real endpoint you can call, complete with the ability to simulate latency, errors, and rate limits.