Is JSON Formatter free to use?

Yes. JSON Formatter on WoDeTool is completely free with no sign-up required. Open the page and start using it immediately.

What JSON syntax errors does the formatter catch?

Common issues: trailing commas, unquoted keys, single quotes instead of double, mismatched brackets, and UTF-8 BOM. With auto-repair on, the first three can often be fixed automatically; mismatched brackets still need a manual edit.

Is minified JSON the same data as formatted JSON?

Yes — formatting only changes whitespace. Minify removes whitespace for compact API payloads; values stay identical.

Does the result support highlighting and collapse?

Yes. After format you get a collapsible tree plus copyable formatted text; the input area also tries to highlight JSON.

online JSON formatter

Format & minify JSON with highlight, collapsible tree, and simple auto-repair

Auto-fix simple format errors

Input JSON

Load from file

Satisfaction Rating

Quick start: JSON Formatter in 3 steps

Paste an API response or config (simple non-strict quotes/keys are OK if auto-repair is on)
Choose format / compress / validate, then run
Expand the tree or copy formatted text; chain to JSON Diff / JSON↔YAML if needed

JSON Formatter: curated examples

•Example: one-line {"code":0,"data":{"items":[…]}} → expandable tree.
•Example: {name:'a',} auto-repaired then beautified.
•Workflow: Format → JSON Diff for contract changes → Timestamp for nested Unix fields.

About JSON Formatter

Paste JSON to format, minify, or validate. Output supports highlighting and expand/collapse at every nested level (large arrays paginate). Auto-repair handles single quotes, unquoted keys, and trailing commas. Around 1.5MB+ enters large-file mode: no input highlight/auto-repair, expand the tree on demand, download the full result.

Broken brackets still need a manual fix; this tool does not invent business fields.

How JSON Formatter works

For quick inspection of responses or almost-valid pasted JSON, a highlighted collapsible tree plus light repair beats opening an IDE. Prefer jq or a local editor for scripts and large files.

Do not paste production secrets into untrusted environments.

Why use JSON Formatter on WoDeTool

WoDeTool keeps JSON Formatter, related utilities, clipboard detection, and pipelines together, so you can work through JSON, JWT, and Diff in one workspace.

Use Smart Clipboard on the home page to auto-detect pasted JSON, Base64, or JWT and jump to JSON Formatter. Save a tool pipeline to chain JSON Formatter with related utilities. Read our guides for real-world workflows.

Create a pipeline →Browse guides →

Common use cases

•Read an API response: Format nested JSON and expand nodes in the tree.
•Fix paste errors: Normalize {name:'a',}-style single quotes / unquoted keys / trailing commas.
•Minify a request body: Collapse to one line for clients that want a single-line body.

Frequently asked questions

Is JSON Formatter free to use?: Yes. JSON Formatter on WoDeTool is completely free with no sign-up required. Open the page and start using it immediately.
What JSON syntax errors does the formatter catch?: Common issues: trailing commas, unquoted keys, single quotes instead of double, mismatched brackets, and UTF-8 BOM. With auto-repair on, the first three can often be fixed automatically; mismatched brackets still need a manual edit.
Is minified JSON the same data as formatted JSON?: Yes — formatting only changes whitespace. Minify removes whitespace for compact API payloads; values stay identical.
Does the result support highlighting and collapse?: Yes. After format you get a collapsible tree plus copyable formatted text; the input area also tries to highlight JSON.