JSON Formatter & Beautifier
Paste your JSON to format, beautify, minify, and validate it instantly. Free, no ads, no sign-up.
What is a JSON Formatter?
A JSON formatter is a free online tool that takes raw or minified JSON text and restructures it into a human-readable layout with consistent indentation and line breaks. JSON (JavaScript Object Notation) is a lightweight data-interchange format widely used in APIs and web applications — but minified JSON is difficult to read and debug. A formatter adds whitespace and nesting to reveal the structure clearly.
jsondecode.com's formatter runs entirely in your browser. No JSON data is ever sent to a server, which makes it safe for use with sensitive or proprietary data. It also validates your JSON and highlights the exact error line when a syntax mistake is detected.
How to Format JSON Online
- 1Paste your JSON — Copy your JSON text and paste it into the input box on the left.
- 2Click Beautify or Minify — Beautify adds indentation for readability; Minify removes whitespace to reduce size.
- 3Review errors — If the JSON is invalid, the error line is highlighted in red and the error message appears below the editor.
- 4Copy the output — Click Copy to copy the formatted JSON to your clipboard.
AI-Powered JSON Conversion Tools
Go beyond formatting — convert your JSON into other schemas and code formats using GPT-4o mini.
JSON to Big Query
Convert your JSON schema into a BigQuery-compatible schema definition.
JSON to Flow
Transform your JSON data into a readable flow diagram structure.
JSON to Go Bson
Convert your JSON into Go struct definitions with BSON tags for MongoDB.
JSON to TypeScript
Generate TypeScript interface definitions from your JSON data automatically.
JSON to YAML
Convert JSON to YAML format — clean, human-readable configuration syntax.
JSON to CSV
Convert a JSON array to CSV format. Each object becomes a row with headers inferred from keys.
JSON to Python
Convert JSON to a Python dataclass or typed dict definition with type annotations.
JSON to SQL
Generate SQL INSERT statements from your JSON data. Works with any standard SQL database.
JSON to Markdown Table
Convert a JSON array into a formatted Markdown table with aligned columns.
Free Encoding & Decoding Tools
Utility tools that run entirely in your browser — no data sent to any server.
JWT Decoder
Decode any JSON Web Token — inspect header, payload, and expiry status.
Base64 Encoder
Convert text or data to Base64 encoding instantly.
Base64 Decoder
Decode any Base64 string back to plain text instantly.
URL Encoder
Percent-encode text for safe use in URLs.
URL Decoder
Decode percent-encoded URL strings back to readable text.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates.
HTML Entity Encoder
Convert special characters to HTML entities for safe markup.
HTML Entity Decoder
Decode HTML entities back to their original characters.
JSON in Every Language
Code examples for parsing and generating JSON in Python, JavaScript, Go, Java, PHP, and more.