JSON Formatter

Free JSON pretty printer with readable syntax error messages.

Private browser-side processing
Input JSONJSON
Paste an API response or config snippet and format it immediately.
1 lines · 59 bytes
Formatted outputJSON
No action has been run yet.
0 lines · 0 bytes

Why use this JSON Formatter

Fast formatting

Turn compact or messy JSON into readable structured output for debugging, documentation, and operations workflows.

Browser-side processing

The formatter runs fully in the browser, which keeps the experience fast and avoids sending your input to a backend service.

Readable errors

When JSON is invalid, the tool highlights the likely line area so users can fix the input quickly without deciphering raw parser output.

Related converters

YAML to JSON
Convert YAML into JSON in the browser. Useful for config files, automation definitions, and quick data inspection.
JSON to YAML
Convert JSON to YAML with a browser-only workflow. Paste input, run the conversion, and copy the output without extra setup.
CSV to JSON
Convert CSV text into a JSON array in the browser. The first row is treated as the header for a predictable output structure.
CSV to Markdown
Convert CSV into a GitHub Flavored Markdown table directly in the browser. Ideal for READMEs, issues, and docs.

Related articles

Can JSON Have Comments? JSONC vs JSON5 vs the _comment TrickPlain JSON forbids // and /* comments. Here are the 4 working alternatives — JSONC, JSON5, _comment fields, and a strip script — with a comparison table and a decision guide for config, data, and API files.curl Pretty Print JSON: 4 Copy-Paste One-Liners for 2026Pretty-print curl JSON output in one line with jq, python -m json.tool, npx formatarc, or a browser tool. Copy-paste commands for macOS, Linux, and Windows.Best Free Chrome JSON Extensions 2026: JSONView, Formatter, FormatArcCompare JSONView, JSON Formatter, and FormatArc — all free and 100% local. Only FormatArc adds paste-to-format, YAML / CSV conversion, and line-numbered errors.FormatArc Chrome Extension: JSON, YAML, CSV & Markdown ToolsFormat JSON and convert YAML, CSV, Markdown, and HTML right from the Chrome toolbar. Popup, right-click JSON formatting, and web handoff — 100% local, no signup, no data sent to a server.formatarc — Format JSON, YAML & CSV from the Terminal (npm / npx)Run npx formatarc to format JSON, convert YAML, CSV, Markdown, and HTML from your terminal. Import it as an API in Node.js projects — no browser needed.JSON Pretty Print — Free Online JSON Formatter, jq & Code Examples (2026)Pretty-print JSON online in your browser, or format it from the terminal with jq and Python. Free JSON formatter with JSON.stringify examples and parse error fixes.How to Write JSON: A Complete Syntax GuideLearn the correct way to write JSON with examples for every data type, nesting patterns, and common mistakes to avoid.What is JSON? A Beginner-Friendly GuideA clear introduction to JSON for beginners covering syntax, data types, and where JSON is used in real-world development.How to Fix JSON Parse Errors and Unexpected TokenA practical guide to diagnosing and fixing JSON parse errors including SyntaxError: Unexpected token, with examples and solutions.