JavaScript Minifier & Beautifier
Reformat or compress scripts with a live diff-ready preview, syntax highlighting, and instant validation.
Helpful reminders
- Beautify before debugging to align braces and clarify nested logic.
- Minified code removes comments—keep source files versioned for reference.
- Ensure ESNext syntax is supported by your runtime prior to minifying aggressively.
Other Tools You May Need
Encode & decode payloads
Use this section when you need to quickly encode/decode content for debugging, inspecting tokens, or sharing safe-to-paste payloads. Several of these tools emphasize quick, in-browser workflows designed for debugging/prototyping without installing extra software.
Format & beautify code
Use this section to make code readable for reviews, debugging, and documentation before committing or sharing snippets. WizardOfAZ’s JSON Formatter and Code Formatter pages explicitly position these tools for clarity and debugging workflows (with formatting features like indentation and clear results).
Minify & optimize assets
Use this section when you want smaller payloads for faster websites, smaller bundles, or cleaner “production-ready” snippets. The CSS Minifier tool page specifically frames minification as removing whitespace/comments and reducing file size while preserving behavior.
Convert data & markup
Use this section when you need to switch formats for APIs, configs, or pipelines (e.g., CSV → JSON, JSON → XML). This is also where “developer-adjacent” conversions like Markdown rendering and color formats belong.
Compare & build payloads
Use this section when you’re actively debugging API behavior: comparing responses, building requests/tokens, and preparing safe-to-paste strings. JWT Decoder is explicitly described as decoding JWT content for inspection (without signature verification), which fits well alongside request/payload construction and comparison tools.
You May Also Need
Best Online Javascript Minifier
The best online JavaScript minifier should support compression and optional symbol mangling, produce source maps, and let you tune safety vs. size for different runtimes. By default, compression folds constants, removes dead code, and shortens syntax while keeping behavior intact under modern engines. Mangling shrinks identifiers, but you may keep class and function names for stack traces or reflection by toggling keep options. A practical UI shows a diff-ready preview so you can spot risky transformations before exporting the bundle. For libraries, generating source maps maintains debuggability after minification in browsers and CI. Since not all ESNext features are safe under legacy targets, a quality minifier exposes compatibility flags so output runs where you deploy. Fast, in-browser minification is convenient for quick fixes, while CI/CD uses the same options to guarantee reproducible builds.
Minify Javascript For Production
For production, enable compression to strip comments and whitespace and remove unreachable or redundant code, then add mangling where compatible to maximize gains. Emit source maps so errors map back to original sources during debugging without shipping verbose code to users. Validate minified output under your exact runtime targets because certain transforms rely on spec details that older engines may not implement fully. As part of page-speed work, JavaScript minification reduces transfer size and parse time, especially on mobile networks. Keep original sources versioned; treat minified files as build artifacts so diffs and reviews remain readable.
Best Js Minifier 2025
In 2025, Terser remains a widely adopted choice thanks to robust compress/mangle pipelines and active maintenance across toolchains. Newer Rust-based projects emphasize speed while attempting parity with established compressors, offering promising throughput for large bundles. When evaluating, test minified output size, build times, and how reliably source maps map stack traces back to TypeScript or JSX originals. Favor tools that integrate cleanly with your bundler and CI, and that expose granular compatibility flags for your supported browsers.
Best Js Minifier 2024
Popular 2024 roundups highlight both Terser and Closure Compiler—Closure performs deeper optimizations when type information is available, while Terser is a flexible default for general codebases. Choose based on ecosystem fit: Terser for typical bundler pipelines, Closure for advanced optimizations in projects structured for it. Whichever you pick, ensure source-map generation and verify error stacks in staging to avoid debugging friction after release.
Best Js Minifier 2022
Back in 2022, Terser already provided async minify APIs, configurable compress passes, and property/identifier mangling suitable for most apps. Closure was preferred in some cases for aggressive optimizations that require stricter inputs and more configuration. Those factors still inform choices today: compatibility, output size, and debuggability should guide selection more than a single benchmark.
Privacy-first processing
WizardOfAZ tools do not need registrations, no accounts or sign-up required. Totally Free.
- Local only: There are many tools that are only processed on your browser, so nothing is sent to our servers.
- Secure Process: Some Tools still need to be processed in the servers so the Old Wizard processes your files securely on our servers, they are automatically deleted after 1 Hour.