JSON5 Formatter Online for Free
A JSON5 formatter takes a config written in the relaxed JSON5 syntax and rewrites it with the indentation a human can read.
Most of the time, when you need to reformat a JSON5 config, the file has trailing commas and comments that a strict JSON beautifier will reject. You end up either stripping the comments by hand or looking for a formatter that understands the syntax.
Our JSON5 Formatter uses the official JSON5 grammar, so trailing commas, block comments, and unquoted keys all parse before the indent is applied.
How to Use the JSON5 Formatter
- Drop the JSON5 in: paste a config into the editor on the left, drag a .json5 or .json file onto the input area, or click Upload File.
- Pick the sidebar mode for your job: JSON5 Formatter for clean indentation on the same syntax, JSON5 to JSON when the next system rejects comments and trailing commas, JSON5 Minifier when the file ships to production, or JSON5 Viewer when the reviewer wants the shape laid out as a tree.
- Choose the indent: two spaces, four spaces, or a real tab from the Indent dropdown so the output matches the convention the repo already uses.
- Take the formatted file out: Copy puts the reformatted JSON5 on your clipboard, and Download saves it as a .json5 file ready to commit.
Features of Our JSON5 Formatter
Comment-Safe Parser
Comments above a compilerOptions block survive the reformat.
Trailing Comma Tolerance
Reformat a config with a comma after the last array entry.
Indent Dropdown
Pick two spaces, four spaces, or a real tab.
Strict JSON Export
One click rewrites the same data as standards-compliant JSON.
Minified JSON5 Output
Strip every byte the parser does not need for a smaller artifact.
Tree Viewer
Why Choose AIFreeForever's JSON5 Formatter
| Capability | AIFreeForever | Typical Online Tools |
|---|---|---|
| JSON5 Syntax | Comments, trailing commas, unquoted keys all parsed | Strict JSON only |
| Indent Control | Two spaces, four spaces, or a real tab | Fixed two spaces |
| Strict JSON Export | One-click rewrite to standards-compliant JSON | Not available |
| Tree Output | Branch-lined tree view for nested configs | Flat text only |
| Privacy | Every pass runs in your tab, nothing uploaded | Config sent to a server |
Who Can Use Our JSON5 Formatter
- Build engineers: reformat a tsconfig.json5 before a pull request review.
- Tooling authors: ship example configs that read cleanly in the project README.
- Library maintainers: accept user-pasted JSON5 with comments and reformat it for an issue reply.
- Frontend developers: clean a .babelrc.json5 the bundler has rewritten into one line.
Easiest way to reformat a JSON5 config with comments intact
Our JSON5 Formatter parses the file with the official JSON5 grammar, so a trailing comma in a compilerOptions array or a // line above a paths entry never blocks the reformat the way a strict JSON parser would.
Comments Welcome
The // and /* */ lines in your config are parsed and ignored so the reformat keeps running.
Indent on Demand
Swap between two spaces, four spaces, and a tab in the toolbar without pasting the file again.
Stays in Your Tab
The JSON5 library runs in your browser so the config never leaves the machine.
