---
title: "YAML to JSON Converter With Error Line Numbers | ToolSugar"
description: "Convert YAML to formatted JSON in your browser. Mistakes are reported with the line and column, and no text is uploaded. Paste or open a file."
canonical: https://toolsugar.com/tools/yaml-to-json
image: https://toolsugar.com/og.png
---

# YAML to JSON

This tool converts YAML into indented JSON in your browser using the yaml library. Paste YAML or open a .yaml file and the JSON updates as you type. A syntax mistake is reported with its line and column. Anchors and aliases are resolved, and only the first document of a file is supported.

Runs on your device

## How it works

1. Paste YAML into the YAML box, or open a .yaml or .yml file.
2. Read the JSON in the result box on the right.
3. If a red message appears, go to the line and column it names.
4. Press Copy or Download to save data.json.

## Key facts

- **Where it runs**: In your browser tab. The text and files you use are never uploaded.
- **Live result**: The output updates as you type or paste, with no button to press.
- **Errors**: Each message starts with the line and column where the YAML parser stopped.
- **Limit**: A file with several documents separated by --- is reported as an error.

## Common uses

- Checking what a Kubernetes or GitHub Actions file really contains.
- Feeding YAML config into a tool that only accepts JSON.
- Finding the indentation slip that breaks a config.

## Questions

### Is my data sent to a server?

No. The conversion runs in your browser with JavaScript, so what you paste or open stays on your device. You can switch off your network after the page loads and it keeps working.

### What happens to anchors and aliases?

They are expanded. Every alias becomes a full copy of the anchored value in the JSON output.

### Why is a value a string in the JSON?

YAML follows its core schema, so only plain values like 12, true and null are typed. Quoted values and anything that does not match stay strings.

### Why does my YAML fail with an indentation error?

YAML needs spaces, not tabs, and every nested level must line up. The line and column in the message point to where the structure stopped making sense.

[Read the YAML to JSON guide](https://toolsugar.com/blog/how-to-convert-yaml-to-json)

## Related tools

- [JSON to YAML](https://toolsugar.com/tools/json-to-yaml)
- [JSON Formatter](https://toolsugar.com/tools/json-formatter)
- [XML to JSON](https://toolsugar.com/tools/xml-to-json)
- [JSON Validator](https://toolsugar.com/tools/json-validator)