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Learn JSON

Short, practical JSON guides: syntax, data types, JSONPath, JSONL, and fixing invalid JSON. Each guide pairs with a free tool so you can practice every concept immediately.

Guides

  1. Visualize nested JSONFollow objects, arrays, types, and paths in a real response.
  2. Open a JSON fileRead local files without uploading their contents.
  3. Large JSON benchmarksReproducible fixtures, methodology, and practical limits.
  4. What is JSON?Syntax, types, and how JSON compares to XML and YAML.
  5. JSON data typesThe six types with examples and spotting tips.
  6. JSONPath syntaxCheat sheet: dots, brackets, wildcards, and slices.
  7. JSON vs JSONLDifferences and when to use each format.
  8. How to fix invalid JSONThe 7 most common errors with before-and-after fixes.

Practice with the tools

  1. JSON formatterPretty-print JSON with 2 or 4 space indentation.
  2. JSON validatorCheck syntax with line-by-line error explanations.
  3. JSON path finderList every path and copy jq queries.

Frequently asked questions

Where should I start learning JSON?

Start with What is JSON for syntax, then JSON data types. If you have a broken document right now, skip to How to fix invalid JSON and the validator.

Are the guides and tools free?

Yes. Every guide is free to read and every linked tool is free to use, with no account. All tools run locally in your browser.

Do the guides assume programming experience?

No. The guides explain concepts from zero with copy-paste examples. The JSONPath and JSONL guides help most once you have seen one real API response.