What is a JSON parser?

A JSON parser reads a JSON string and converts it into a structured data object you can inspect, validate, and navigate. JSON Parser Online parses JSON instantly in your browser and displays it as a colour-coded interactive tree view.

How do I format or beautify JSON online?

Paste your JSON into the input box and click 'Format / Beautify'. The tool re-indents your JSON with 2-space indentation, making it easy to read. You can also minify it back to a single line using the 'Minify' button.

Is this JSON tool free to use?

Yes, completely free. No sign-up, no registration, no ads, and no limits. JSON Parser Online is a free developer tool.

JSON Parser Online – Free JSON Formatter, Validator & Tree Viewer

JSON Parser Online is a free, fast and private tool for developers to parse JSON, format JSON, validate JSON, decode JSON and explore JSON data as an interactive tree view. Also known as a JSON beautifier, JSON lint, JSON checker or JSON deserializer — everything runs 100% client-side in your browser. Your data is never sent to any server.

Features

JSON Parser – paste any JSON string and parse it instantly in your browser
JSON Formatter / Beautifier – pretty-print JSON with 2-space, 3-space or 4-space indentation
JSON Minifier / Compactor – compress JSON to a single compact line
JSON Validator – real-time syntax error detection with exact error location
JSON Lint – lint your JSON and fix syntax errors instantly
JSON Decode Online – decode and deserialize JSON strings
Interactive JSON Tree View – collapse, expand and navigate nested objects and arrays
JSON Search – search across all keys and values in the document
6 colour themes – Dark, Light, Monokai, Nord, Solarized Dark, Dracula
100% private – no data is sent to any server, ever
Free to use – no sign-up, no login, no limits
Works on Windows, Mac, Linux, Chrome, Firefox, Safari and Edge

How to Parse and Format JSON Online

Paste or type your JSON string into the Input pane on the left.
The tool validates and parses your JSON automatically as you type. A green badge confirms valid JSON; a red error bar shows the exact syntax problem if invalid.
The right pane displays your JSON as a colour-coded interactive tree. Click any node to collapse or expand it.
Click Format / Beautify to pretty-print the JSON, or Minify to compress it to one line.
Click Copy Output to copy the result to your clipboard.
Use the search box to find any key or value anywhere in the document.

JSON Parser Online – Frequently Asked Questions

What is an online JSON parser?

An online JSON parser is a browser-based tool that reads a raw JSON string and converts it into a structured, human-readable format. Use it to debug API responses, inspect configuration files, or validate JSON data from any source. JSON Parser Online also renders JSON as a collapsible tree view, making complex nested structures easy to navigate.

How do I format JSON online?

Paste your JSON into the input box. The tool formats it automatically. You can also click Format / Beautify to re-indent with 2 spaces. Use Minify to compress JSON back to a single line.

How do I validate JSON online?

Paste JSON into the input pane. A green Valid JSON badge confirms your JSON is well-formed. A red error bar appears immediately when there is a syntax problem, showing the exact error message so you can fix it fast. This tool works as a JSON lint checker.

How do I decode or deserialize JSON?

Paste your encoded JSON string into the input pane and click Parse JSON or use Eval JSON to evaluate JavaScript object literals that are not strict JSON. The decoded object appears in the tree view.

Is my JSON data private and secure?

Completely. JSON Parser Online runs entirely in your browser using JavaScript. Your JSON data is never transmitted to any server, making it safe to use with sensitive or confidential data such as API keys, tokens or private records.

Is this JSON formatter tool free?

Yes. JSON Parser Online is completely free with no ads, no sign-up, no registration and no usage limits.

What browsers and operating systems are supported?

JSON Parser Online works on all modern browsers — Chrome, Firefox, Safari and Edge — and on all operating systems including Windows, macOS and Linux. It also works on mobile browsers on Android and iOS.

What is the difference between JSON parse and JSON format?

JSON parsing converts a raw JSON string into a structured data object. JSON formatting (beautifying) re-indents an existing JSON string so it is easier to read. JSON Parser Online does both simultaneously: it parses your JSON and renders it as a formatted, colour-coded tree.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight, human-readable data-interchange format. It is widely used for transferring data between web APIs and clients, and as a configuration file format. JSON supports strings, numbers, booleans, null, arrays and objects.