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JSON Prettifier for VS Code Users

VS Code with the built-in Format Document command or the Prettier extension is the standard JSON prettifier for most developers, but there are plenty of moments when opening the editor is too much friction for the task: a quick paste from Slack, a snippet from a log line, a sample from an API client that you do not want to save as a file.

Native JSON tool

JSON Formatter

Runs in your browser

JSON input

Formatted JSON

Run the tool to see a task-specific result.

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Runs locally in your browser

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No server upload during processing

✨

No server-side file retention

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No watermark added

Cost: Free tier
Sign-up: Not required
Processing: Tool-specific
Privacy: Clearly disclosed

IframeResponsiveAttribution included

Add this JSON Formatter to your website

Drop the JSON Formatter into a blog post, product docs, intranet, or school portal with one iframe. Processing, privacy, and usage limits are the same as on the full tool page.

One copy-ready line of HTML
Responsive — adapts to any container width
No API credentials are placed in the snippet

Embed code

<iframe
  src="https://www.fixtools.io/json/json-formatter?embed=1"
  width="100%"
  height="780"
  frameborder="0"
  style="border:0;border-radius:16px;max-width:900px;"
  title="JSON Formatter by FixTools"
  loading="lazy"
  allow="clipboard-write"
></iframe>

<iframe
  src="https://www.fixtools.io/json/json-formatter?embed=1"
  width="100%"
  height="780"
  frameborder="0"
  style="border:0;border-radius:16px;max-width:900px;"
  title="JSON Formatter by FixTools"
  loading="lazy"
  allow="clipboard-write"
></iframe>

Attribution-friendly: a small "Powered by FixTools" link appears in the embed footer.

Why a Browser JSON Prettifier Complements VS Code Rather Than Replacing It

VS Code is the dominant editor for modern web development and ships with a capable JSON language server that handles formatting, validation, and schema-aware editing for project files. For files that live in a project, VS Code is the right tool: it remembers your indent preferences, integrates with version control, runs your linters, and stays open across multiple snippets in tabs. For snippets that do not live in a file, the friction of creating a temporary file, pasting the snippet, formatting, copying, and discarding the file is real, especially when you only need a quick visual scan of the data. A browser-based prettifier accepts the paste directly without any file creation, which saves the dozen interactions involved in the VS Code path for ad-hoc snippets.

The browser approach also wins for snippets you would not want to save to disk at all. JSON containing API tokens, customer identifiers, or one-time debugging payloads should not enter your project working directory because the file may be accidentally committed, picked up by your project linter, or persisted in your editor's recently-opened list. The browser tab is ephemeral by default and clears when you close it. For genuinely sensitive snippets, the browser also makes it easy to verify that no data leaves the device: open DevTools, watch the Network tab while formatting, and confirm no outbound requests fire. This verification is much harder with a desktop editor where you cannot trivially observe what files or networks the application is touching.

The Prettier default for JSON files is 2-space indentation, double-quoted strings (which is also the JSON specification requirement), and a trailing newline at the end of the file. FixTools matches these defaults exactly when 2-space indent is selected, so output from FixTools pasted into a VS Code file does not change when the file is saved with Prettier enabled. This eliminates a common micro-friction where copying formatted JSON from one tool into a Prettier-managed project file causes spurious whitespace changes on save, polluting git diffs and prompting reformat-on-save warnings. The consistency between the browser and editor formatters is intentional and matches what Prettier itself produces for the same input.

For projects that diverge from the Prettier defaults, FixTools offers 4-space and tab indent options to match. Python projects often use 4-space JSON indentation to match PEP 8 conventions for surrounding Python source. Go projects sometimes use tabs to match the gofmt default applied to surrounding Go source. JavaScript and TypeScript projects almost always use 2 spaces. Match your project setting before pasting into a project file, and the result integrates cleanly without triggering reformat behaviours. For ad-hoc snippets that are not destined for a project file, the choice of indent is purely a readability preference for your own consumption during the moment.

The VS Code JSON language server validates against any JSON Schema configured in the workspace, which catches type errors and structural problems beyond pure syntax. A browser-based formatter does not have access to your workspace schema, so it validates only against the RFC 8259 syntax rules. For schema-aware validation of ad-hoc snippets, paste the snippet into a temporary VS Code file with the schema reference set in the json.schemas workspace setting, or use a browser-based JSON Schema validator separately. The two-step workflow of format in browser, validate in editor is fast and combines the strengths of both tools without forcing you to use either for tasks the other does better.

VS Code JSON editing documentation Prettier JSON parser documentation JSON Schema specification RFC 8259, The JavaScript Object Notation Data Interchange Format

How to use this tool

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Paste your JSON, click Format with 2-space indent. The output matches Prettier defaults and can be pasted straight into a VS Code file.

How It Works

Step-by-step guide to json prettifier for vs code users:

1
Paste your snippet
Paste the JSON snippet you want to prettify into the FixTools input area. Snippets come from many sources during a normal workflow: API responses copied from Postman, log lines copied from a terminal, payloads copied from a colleague's Slack message, or sample data from a documentation page. The formatter accepts any of these without requiring you to clean up the source.
2
Use 2-space indent
Leave the default 2-space indent selected to match the Prettier default that ships in most VS Code workspaces. If your project uses 4 spaces or tabs, switch the indent setting to match before formatting. The output then pastes into a VS Code file without triggering whitespace re-formatting when you save with Prettier enabled on the project.
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Click Format
Click the Format button. The tool parses the input, validates it against RFC 8259, and produces indented output with syntax highlighting. If the snippet contains a syntax error the line and column of the error are reported, which lets you fix the source the same way you would fix a JSON syntax error highlighted by the VS Code JSON language server.
4
Paste into VS Code
Copy the formatted result and paste it into your VS Code file. The output is consistent with the VS Code built-in formatter and the Prettier extension default settings, so saving the file does not produce any whitespace changes from the saved-on-format behaviour. The snippet integrates cleanly into the surrounding code or configuration without manual reformatting.

Real-world examples

Common situations where this approach makes a real difference:

Frontend developer

Ephemeral snippet handling without scratch files keeps the project working directory clean of one-off debugging artefacts.

API consumer

A dedicated browser tab provides more horizontal space than Postman or Insomnia response panes for inspecting wide JSON structures.

Pair programming partner

Ad-hoc collaboration over JSON benefits from a stateless browser tool that does not require any shared setup between the participants.

Code reviewer

Quick fixture inspection during code review benefits from a browser tool that accepts a paste and produces a readable view in seconds.

Pro tips

Get better results with these expert suggestions:

Match your project Prettier config

Check your project .prettierrc or prettier.config.js file for the JSON formatting options. The most common setting is 2-space indent (the default), but some projects override to 4 spaces or tabs. Select the same indent in FixTools before formatting a snippet you intend to paste into a project file. This avoids the cycle of pasting, saving, watching Prettier reformat, and reviewing the resulting whitespace diff that adds nothing meaningful to the change.

Use FixTools for snippets, VS Code for files

A simple rule that saves time: any JSON that you would not save to disk should go through the browser, and any JSON that lives in a project file should go through VS Code. The browser handles ad-hoc snippets without the overhead of creating and discarding files. VS Code handles project files with full schema validation, linting integration, and version control awareness. Using each tool for its strength reduces friction in both directions across a typical developer day.

Verify ephemeral processing in DevTools

For snippets containing sensitive data, open the browser DevTools Network tab before formatting. Click Format and observe that no outbound HTTP requests appear in the panel. This confirms that the JSON is processed entirely client-side and never leaves your device. The verification takes a few seconds and is much more trustworthy than relying on the documentation claim alone, especially for high-sensitivity data that has compliance implications if it leaks.

Keep a browser tab pinned to FixTools

For developers who format JSON snippets multiple times per day, keep a browser tab permanently open to the FixTools JSON Formatter. The pinned tab is one click away in any browser, faster than opening VS Code and creating a scratch file. Pair with a keyboard shortcut to focus the browser tab (Cmd-Tab on macOS, Alt-Tab on Windows, or a browser-specific tab keyboard shortcut) and the formatting roundtrip drops to a few seconds for any snippet you have on the clipboard.

FAQ

Frequently asked questions

The default 2-space indent in FixTools matches the default produced by the VS Code built-in JSON formatter and the Prettier extension. Output from FixTools pasted into a VS Code file does not trigger any whitespace changes when the file is saved with Prettier enabled. For projects that override the default to 4-space or tab indentation, switch the FixTools indent setting to match before formatting. The two tools produce equivalent output for the same input when the indent settings match, which is the goal of the consistency.

VS Code is the right tool for project files where you want schema validation, linter integration, and version control awareness. A browser formatter is faster for ad-hoc snippets that do not warrant creating a file, because there is no file creation, no save dialog, and no recently-opened-files entry to clean up afterwards. Many developers use both: VS Code for project work, a pinned browser tab for the dozen snippets per day that come from logs, chat messages, Postman responses, and other ephemeral sources.

No. FixTools is a web tool, not a VS Code extension. For an in-editor JSON formatter, use the built-in VS Code Format Document command (Shift-Alt-F by default) or install the Prettier extension from the marketplace. These integrate with the project workspace settings and run on save if configured. FixTools is intended for the use cases where a separate browser tab is more convenient than opening the editor, which complements rather than competes with the editor-based options.

Check your .prettierrc file or prettier.config.js for the JSON parser settings. The most common override is the tabWidth or useTabs option, which corresponds to the FixTools indent setting (2 spaces, 4 spaces, or tabs). Match the FixTools indent to the Prettier setting before formatting a snippet that you intend to paste into a project file. This avoids generating spurious whitespace changes when the project Prettier configuration runs on save and reformats your pasted snippet.

The FixTools JSON Formatter validates only against RFC 8259 syntax rules, not against a JSON Schema. For schema-aware validation, use the VS Code JSON language server with a workspace schema reference, or use a browser-based JSON Schema validator separately. The schema validation step verifies that the structure, field types, and required fields match a documented contract, which is a stronger guarantee than syntax validation alone. The two-step workflow of syntax format in browser and schema validation in editor combines the strengths of both tools.

After the first visit to FixTools with an internet connection, modern browsers cache the page and JavaScript bundles, so the formatter may continue to work on subsequent visits without an internet connection. The behaviour depends on the browser cache settings and the FixTools service worker configuration. VS Code, by contrast, runs as a desktop application and is always available offline once installed. For guaranteed offline JSON formatting, VS Code is the more reliable choice; for online or intermittent-connection use, FixTools works without any setup.

Yes, by copying the JSON from the SSH session to your local clipboard and pasting into FixTools in your local browser. The terminal-to-clipboard copy works through the standard terminal selection mechanism in most SSH clients. For workflows where you frequently format JSON on a remote machine, install jq on the remote machine and use jq . file.json at the remote command line to produce formatted output directly without the round-trip to your local browser. jq is the standard remote-friendly JSON formatter.