node \- Server-side JavaScript

.B node

[

.B \-v

]

[

.B \-\-debug

|

.B \-\-debug-brk

]

[

.B \-\-v8-options

]

.br

[

.B \-e

.I command

|

.I script.js

]

[

.I arguments

]

Execute without arguments to start the REPL.

Node.js is a set of libraries for JavaScript which allows

it to be used outside of the browser. It is primarily

focused on creating simple, easy to build network clients

and servers.

-v, --version print node's version

-e, --eval script evaluate script

-p, --print print result of --eval

-c, --check syntax check script without executing

-i, --interactive always enter the REPL even if stdin

does not appear to be a terminal

-r, --require module to preload at startup

--no-deprecation silence deprecation warnings

--trace-deprecation show stack traces on deprecations

--throw-deprecation throw errors on deprecations

--track-heap-objects track heap object allocations for heap snapshots

--prof-process process v8 profiler output generated using --prof

--v8-options print v8 command line options

--tls-cipher-list=list use an alternative default TLS cipher list

(available only when Node.js is built with

OpenSSL and crypto support enabled)

.IP NODE_PATH

\':\'\-separated list of directories prefixed to the module search path.

.IP NODE_DISABLE_COLORS

If set to 1 then colors will not be used in the REPL.

.IP NODE_ICU_DATA

Data path for ICU (Intl object) data. Will extend linked-in data when compiled

with small-icu support.

.IP NODE_REPL_HISTORY

Path to the file used to store the persistent REPL history. The default path

is ~/.node_repl_history, which is overridden by this variable. Setting the

value to an empty string ("") disables persistent REPL history.

--use_strict (enforce strict mode)

type: bool default: false

--use_strong (enforce strong mode)

type: bool default: false

--strong_mode (experimental strong language mode)

type: bool default: false

--strong_this (don't allow 'this' to escape from constructors)

type: bool default: true

--es_staging (enable all completed harmony features)

type: bool default: false

--harmony (enable all completed harmony features)

type: bool default: false

--harmony_shipping (enable all shipped harmony fetaures)

type: bool default: true

--legacy_const (legacy semantics for const in sloppy mode)

type: bool default: true

--harmony_modules (enable "harmony modules" (in progress))

type: bool default: false

--harmony_regexps (enable "harmony regular expression extensions" (in progress))

type: bool default: false

--harmony_proxies (enable "harmony proxies" (in progress))

type: bool default: false

--harmony_sloppy_function (enable "harmony sloppy function block scoping" (in progress))

type: bool default: false

--harmony_sloppy_let (enable "harmony let in sloppy mode" (in progress))

type: bool default: false

--harmony_unicode_regexps (enable "harmony unicode regexps" (in progress))

type: bool default: false

--harmony_reflect (enable "harmony Reflect API" (in progress))

type: bool default: false

--harmony_destructuring (enable "harmony destructuring" (in progress))

type: bool default: false

--harmony_default_parameters (enable "harmony default parameters" (in progress))

type: bool default: false

--harmony_sharedarraybuffer (enable "harmony sharedarraybuffer" (in progress))

type: bool default: false

--harmony_atomics (enable "harmony atomics" (in progress))

type: bool default: false

--harmony_simd (enable "harmony simd" (in progress))

type: bool default: false

--harmony_array_includes (enable "harmony Array.prototype.includes")

type: bool default: false

--harmony_tostring (enable "harmony toString")

type: bool default: false

--harmony_concat_spreadable (enable "harmony isConcatSpreadable")

type: bool default: false

--harmony_rest_parameters (enable "harmony rest parameters")

type: bool default: false

--harmony_sloppy (enable "harmony features in sloppy mode")

type: bool default: false

--harmony_arrow_functions (enable "harmony arrow functions")

type: bool default: true

--harmony_new_target (enable "harmony new.target")

type: bool default: true

--harmony_object_observe (enable "harmony Object.observe")

type: bool default: true

--harmony_spreadcalls (enable "harmony spread-calls")

type: bool default: true

--harmony_spread_arrays (enable "harmony spread in array literals")

type: bool default: true

--harmony_object (enable "harmony Object methods")

type: bool default: true

--compiled_keyed_generic_loads (use optimizing compiler to generate keyed generic load stubs)

type: bool default: false

--pretenuring_call_new (pretenure call new)

type: bool default: false

--allocation_site_pretenuring (pretenure with allocation sites)

type: bool default: true

--trace_pretenuring (trace pretenuring decisions of HAllocate instructions)

type: bool default: false

--trace_pretenuring_statistics (trace allocation site pretenuring statistics)

type: bool default: false

--track_fields (track fields with only smi values)

type: bool default: true

--track_double_fields (track fields with double values)

type: bool default: true

--track_heap_object_fields (track fields with heap values)

type: bool default: true

--track_computed_fields (track computed boilerplate fields)

type: bool default: true

--track_field_types (track field types)

type: bool default: true

--smi_binop (support smi representation in binary operations)

type: bool default: true

--optimize_for_size (Enables optimizations which favor memory size over execution speed)

type: bool default: false

--unbox_double_arrays (automatically unbox arrays of doubles)

type: bool default: true

--string_slices (use string slices)

type: bool default: true

--ignition (use ignition interpreter)

type: bool default: false

--ignition_filter (filter for ignition interpreter)

type: string default: ~~

--print_bytecode (print bytecode generated by ignition interpreter)

type: bool default: false

--trace_ignition_codegen (trace the codegen of ignition interpreter bytecode handlers)

type: bool default: false

--crankshaft (use crankshaft)

type: bool default: true

--hydrogen_filter (optimization filter)

type: string default: *

--use_gvn (use hydrogen global value numbering)

type: bool default: true

--gvn_iterations (maximum number of GVN fix-point iterations)

type: int default: 3

--use_canonicalizing (use hydrogen instruction canonicalizing)

type: bool default: true

--use_inlining (use function inlining)

type: bool default: true

--use_escape_analysis (use hydrogen escape analysis)

type: bool default: true

--use_allocation_folding (use allocation folding)

type: bool default: true

--use_local_allocation_folding (only fold in basic blocks)

type: bool default: false

--use_write_barrier_elimination (eliminate write barriers targeting allocations in optimized code)

type: bool default: true

--max_inlining_levels (maximum number of inlining levels)

type: int default: 5

--max_inlined_source_size (maximum source size in bytes considered for a single inlining)

type: int default: 600

--max_inlined_nodes (maximum number of AST nodes considered for a single inlining)

type: int default: 196

--max_inlined_nodes_cumulative (maximum cumulative number of AST nodes considered for inlining)

type: int default: 400

--loop_invariant_code_motion (loop invariant code motion)

type: bool default: true

--fast_math (faster (but maybe less accurate) math functions)

type: bool default: true

--collect_megamorphic_maps_from_stub_cache (crankshaft harvests type feedback from stub cache)

type: bool default: true

--hydrogen_stats (print statistics for hydrogen)

type: bool default: false

--trace_check_elimination (trace check elimination phase)

type: bool default: false

--trace_environment_liveness (trace liveness of local variable slots)

type: bool default: false

--trace_hydrogen (trace generated hydrogen to file)

type: bool default: false

--trace_hydrogen_filter (hydrogen tracing filter)

type: string default: *

--trace_hydrogen_stubs (trace generated hydrogen for stubs)

type: bool default: false

--trace_hydrogen_file (trace hydrogen to given file name)

type: string default: NULL

--trace_phase (trace generated IR for specified phases)

type: string default: HLZ

--trace_inlining (trace inlining decisions)

type: bool default: false

--trace_load_elimination (trace load elimination)

type: bool default: false

--trace_store_elimination (trace store elimination)

type: bool default: false

--trace_alloc (trace register allocator)

type: bool default: false

--trace_all_uses (trace all use positions)

type: bool default: false

--trace_range (trace range analysis)

type: bool default: false

--trace_gvn (trace global value numbering)

type: bool default: false

--trace_representation (trace representation types)

type: bool default: false

--trace_removable_simulates (trace removable simulates)

type: bool default: false

--trace_escape_analysis (trace hydrogen escape analysis)

type: bool default: false

--trace_allocation_folding (trace allocation folding)

type: bool default: false

--trace_track_allocation_sites (trace the tracking of allocation sites)

type: bool default: false

--trace_migration (trace object migration)

type: bool default: false

--trace_generalization (trace map generalization)

type: bool default: false

--stress_pointer_maps (pointer map for every instruction)

type: bool default: false

--stress_environments (environment for every instruction)

type: bool default: false

--deopt_every_n_times (deoptimize every n times a deopt point is passed)

type: int default: 0

--deopt_every_n_garbage_collections (deoptimize every n garbage collections)

type: int default: 0

--print_deopt_stress (print number of possible deopt points)

type: bool default: false

--trap_on_deopt (put a break point before deoptimizing)

type: bool default: false

--trap_on_stub_deopt (put a break point before deoptimizing a stub)

type: bool default: false

--deoptimize_uncommon_cases (deoptimize uncommon cases)

type: bool default: true

--polymorphic_inlining (polymorphic inlining)

type: bool default: true

--use_osr (use on-stack replacement)

type: bool default: true

--array_bounds_checks_elimination (perform array bounds checks elimination)

type: bool default: true

--trace_bce (trace array bounds check elimination)

type: bool default: false

--array_bounds_checks_hoisting (perform array bounds checks hoisting)

type: bool default: false

--array_index_dehoisting (perform array index dehoisting)

type: bool default: true

--analyze_environment_liveness (analyze liveness of environment slots and zap dead values)

type: bool default: true

--load_elimination (use load elimination)

type: bool default: true

--check_elimination (use check elimination)

type: bool default: true

--store_elimination (use store elimination)

type: bool default: false

--dead_code_elimination (use dead code elimination)

type: bool default: true

--fold_constants (use constant folding)

type: bool default: true

--trace_dead_code_elimination (trace dead code elimination)

type: bool default: false

--unreachable_code_elimination (eliminate unreachable code)

type: bool default: true

--trace_osr (trace on-stack replacement)

type: bool default: false

--stress_runs (number of stress runs)

type: int default: 0

--lookup_sample_by_shared (when picking a function to optimize, watch for shared function info, not JSFunction itself)

type: bool default: true

--cache_optimized_code (cache optimized code for closures)

type: bool default: true

--flush_optimized_code_cache (flushes the cache of optimized code for closures on every GC)

type: bool default: true

--inline_construct (inline constructor calls)

type: bool default: true

--inline_arguments (inline functions with arguments object)

type: bool default: true

--inline_accessors (inline JavaScript accessors)

type: bool default: true

--escape_analysis_iterations (maximum number of escape analysis fix-point iterations)

type: int default: 2

--optimize_for_in (optimize functions containing for-in loops)

type: bool default: true

--concurrent_recompilation (optimizing hot functions asynchronously on a separate thread)

type: bool default: true

--trace_concurrent_recompilation (track concurrent recompilation)

type: bool default: false

--concurrent_recompilation_queue_length (the length of the concurrent compilation queue)

type: int default: 8

--concurrent_recompilation_delay (artificial compilation delay in ms)

type: int default: 0

--block_concurrent_recompilation (block queued jobs until released)

type: bool default: false

--concurrent_osr (concurrent on-stack replacement)

type: bool default: true

--omit_map_checks_for_leaf_maps (do not emit check maps for constant values that have a leaf map, deoptimize the optimized code if the layout of the maps changes.)

type: bool default: true

--turbo (enable TurboFan compiler)

type: bool default: false

--turbo_shipping (enable TurboFan compiler on subset)

type: bool default: true

--turbo_greedy_regalloc (use the greedy register allocator)

type: bool default: false

--turbo_preprocess_ranges (run pre-register allocation heuristics)

type: bool default: false

--turbo_filter (optimization filter for TurboFan compiler)

type: string default: ~~

--trace_turbo (trace generated TurboFan IR)

type: bool default: false

--trace_turbo_graph (trace generated TurboFan graphs)

type: bool default: false

--trace_turbo_cfg_file (trace turbo cfg graph (for C1 visualizer) to a given file name)

type: string default: NULL

--trace_turbo_types (trace TurboFan's types)

type: bool default: true

--trace_turbo_scheduler (trace TurboFan's scheduler)

type: bool default: false

--trace_turbo_reduction (trace TurboFan's various reducers)

type: bool default: false

--trace_turbo_jt (trace TurboFan's jump threading)

type: bool default: false

--trace_turbo_ceq (trace TurboFan's control equivalence)

type: bool default: false

--turbo_asm (enable TurboFan for asm.js code)

type: bool default: true

--turbo_asm_deoptimization (enable deoptimization in TurboFan for asm.js code)

type: bool default: false

--turbo_verify (verify TurboFan graphs at each phase)

type: bool default: false

--turbo_stats (print TurboFan statistics)

type: bool default: false

--turbo_splitting (split nodes during scheduling in TurboFan)

type: bool default: true

--turbo_types (use typed lowering in TurboFan)

type: bool default: true

--turbo_type_feedback (use type feedback in TurboFan)

type: bool default: false

--turbo_allocate (enable inline allocations in TurboFan)

type: bool default: false

--turbo_source_positions (track source code positions when building TurboFan IR)

type: bool default: false

--context_specialization (enable context specialization in TurboFan)

type: bool default: false

--turbo_inlining (enable inlining in TurboFan)

type: bool default: false

--trace_turbo_inlining (trace TurboFan inlining)

type: bool default: false

--loop_assignment_analysis (perform loop assignment analysis)

type: bool default: true

--turbo_profiling (enable profiling in TurboFan)

type: bool default: false

--turbo_verify_allocation (verify register allocation in TurboFan)

type: bool default: false

--turbo_move_optimization (optimize gap moves in TurboFan)

type: bool default: true

--turbo_jt (enable jump threading in TurboFan)

type: bool default: true

--turbo_osr (enable OSR in TurboFan)

type: bool default: true

--turbo_try_catch (enable try-catch support in TurboFan)

type: bool default: true

--turbo_try_finally (enable try-finally support in TurboFan)

type: bool default: false

--turbo_stress_loop_peeling (stress loop peeling optimization)

type: bool default: false

--turbo_cf_optimization (optimize control flow in TurboFan)

type: bool default: true

--turbo_frame_elision (elide frames in TurboFan)

type: bool default: true

--turbo_cache_shared_code (cache context-independent code)

type: bool default: true

--turbo_preserve_shared_code (keep context-independent code)

type: bool default: false

--typed_array_max_size_in_heap (threshold for in-heap typed array)

type: int default: 64

--frame_count (number of stack frames inspected by the profiler)

type: int default: 1

--interrupt_budget (execution budget before interrupt is triggered)

type: int default: 6144

--type_info_threshold (percentage of ICs that must have type info to allow optimization)

type: int default: 25

--generic_ic_threshold (max percentage of megamorphic/generic ICs to allow optimization)

type: int default: 30

--self_opt_count (call count before self-optimization)

type: int default: 130

--trace_opt_verbose (extra verbose compilation tracing)

type: bool default: false

--debug_code (generate extra code (assertions) for debugging)

type: bool default: false

--code_comments (emit comments in code disassembly)

type: bool default: false

--enable_sse3 (enable use of SSE3 instructions if available)

type: bool default: true

--enable_sse4_1 (enable use of SSE4.1 instructions if available)

type: bool default: true

--enable_sahf (enable use of SAHF instruction if available (X64 only))

type: bool default: true

--enable_avx (enable use of AVX instructions if available)

type: bool default: true

--enable_fma3 (enable use of FMA3 instructions if available)

type: bool default: true

--enable_bmi1 (enable use of BMI1 instructions if available)

type: bool default: true

--enable_bmi2 (enable use of BMI2 instructions if available)

type: bool default: true

--enable_lzcnt (enable use of LZCNT instruction if available)

type: bool default: true

--enable_popcnt (enable use of POPCNT instruction if available)

type: bool default: true

--enable_vfp3 (enable use of VFP3 instructions if available)

type: bool default: true

--enable_armv7 (enable use of ARMv7 instructions if available (ARM only))

type: bool default: true

--enable_armv8 (enable use of ARMv8 instructions if available (ARM 32-bit only))

type: bool default: true

--enable_neon (enable use of NEON instructions if available (ARM only))

type: bool default: true

--enable_sudiv (enable use of SDIV and UDIV instructions if available (ARM only))

type: bool default: true

--enable_mls (enable use of MLS instructions if available (ARM only))

type: bool default: true

--enable_movw_movt (enable loading 32-bit constant by means of movw/movt instruction pairs (ARM only))

type: bool default: false

--enable_unaligned_accesses (enable unaligned accesses for ARMv7 (ARM only))

type: bool default: true

--enable_32dregs (enable use of d16-d31 registers on ARM - this requires VFP3)

type: bool default: true

--enable_vldr_imm (enable use of constant pools for double immediate (ARM only))

type: bool default: false

--force_long_branches (force all emitted branches to be in long mode (MIPS/PPC only))

type: bool default: false

--mcpu (enable optimization for specific cpu)

type: string default: auto

--expose_natives_as (expose natives in global object)

type: string default: NULL

--expose_debug_as (expose debug in global object)

type: string default: NULL

--expose_free_buffer (expose freeBuffer extension)

type: bool default: false

--expose_gc (expose gc extension)

type: bool default: false

--expose_gc_as (expose gc extension under the specified name)

type: string default: NULL

--expose_externalize_string (expose externalize string extension)

type: bool default: false

--expose_trigger_failure (expose trigger-failure extension)

type: bool default: false

--stack_trace_limit (number of stack frames to capture)

type: int default: 10

--builtins_in_stack_traces (show built-in functions in stack traces)

type: bool default: false

--disable_native_files (disable builtin natives files)

type: bool default: false

--inline_new (use fast inline allocation)

type: bool default: true

--trace_codegen (print name of functions for which code is generated)

type: bool default: false

--trace (trace function calls)

type: bool default: false

--mask_constants_with_cookie (use random jit cookie to mask large constants)

type: bool default: true

--lazy (use lazy compilation)

type: bool default: true

--trace_opt (trace lazy optimization)

type: bool default: false

--trace_opt_stats (trace lazy optimization statistics)

type: bool default: false

--opt (use adaptive optimizations)

type: bool default: true

--always_opt (always try to optimize functions)

type: bool default: false

--always_osr (always try to OSR functions)

type: bool default: false

--prepare_always_opt (prepare for turning on always opt)

type: bool default: false

--trace_deopt (trace optimize function deoptimization)

type: bool default: false

--trace_stub_failures (trace deoptimization of generated code stubs)

type: bool default: false

--serialize_toplevel (enable caching of toplevel scripts)

type: bool default: true

--serialize_inner (enable caching of inner functions)

type: bool default: true

--trace_serializer (print code serializer trace)

type: bool default: false

--min_preparse_length (minimum length for automatic enable preparsing)

type: int default: 1024

--max_opt_count (maximum number of optimization attempts before giving up.)

type: int default: 10

--compilation_cache (enable compilation cache)

type: bool default: true

--cache_prototype_transitions (cache prototype transitions)

type: bool default: true

--cpu_profiler_sampling_interval (CPU profiler sampling interval in microseconds)

type: int default: 1000

--trace_debug_json (trace debugging JSON request/response)

type: bool default: false

--trace_js_array_abuse (trace out-of-bounds accesses to JS arrays)

type: bool default: false

--trace_external_array_abuse (trace out-of-bounds-accesses to external arrays)

type: bool default: false

--trace_array_abuse (trace out-of-bounds accesses to all arrays)

type: bool default: false

--enable_liveedit (enable liveedit experimental feature)

type: bool default: true

--hard_abort (abort by crashing)

type: bool default: true

--stack_size (default size of stack region v8 is allowed to use (in kBytes))

type: int default: 984

--max_stack_trace_source_length (maximum length of function source code printed in a stack trace.)

type: int default: 300

--always_inline_smi_code (always inline smi code in non-opt code)

type: bool default: false

--min_semi_space_size (min size of a semi-space (in MBytes), the new space consists of twosemi-spaces)

type: int default: 0

--target_semi_space_size (target size of a semi-space (in MBytes) before triggering a GC)

type: int default: 0

--max_semi_space_size (max size of a semi-space (in MBytes), the new space consists of twosemi-spaces)

type: int default: 0

--semi_space_growth_factor (factor by which to grow the new space)

type: int default: 2

--experimental_new_space_growth_heuristic (Grow the new space based on the percentage of survivors instead of their absolute value.)

type: bool default: false

--max_old_space_size (max size of the old space (in Mbytes))

type: int default: 0

--initial_old_space_size (initial old space size (in Mbytes))

type: int default: 0

--max_executable_size (max size of executable memory (in Mbytes))

type: int default: 0

--gc_global (always perform global GCs)

type: bool default: false

--gc_interval (garbage collect after <n> allocations)

type: int default: -1

--retain_maps_for_n_gc (keeps maps alive for <n> old space garbage collections)

type: int default: 2

--trace_gc (print one trace line following each garbage collection)

type: bool default: false

--trace_gc_nvp (print one detailed trace line in name=value format after each garbage collection)

type: bool default: false

--trace_gc_ignore_scavenger (do not print trace line after scavenger collection)

type: bool default: false

--trace_idle_notification (print one trace line following each idle notification)

type: bool default: false

--trace_idle_notification_verbose (prints the heap state used by the idle notification)

type: bool default: false

--print_cumulative_gc_stat (print cumulative GC statistics in name=value format on exit)

type: bool default: false

--print_max_heap_committed (print statistics of the maximum memory committed for the heap in name=value format on exit)

type: bool default: false

--trace_gc_verbose (print more details following each garbage collection)

type: bool default: false

--trace_allocation_stack_interval (print stack trace after <n> free-list allocations)

type: int default: -1

--trace_fragmentation (report fragmentation for old space)

type: bool default: false

--trace_fragmentation_verbose (report fragmentation for old space (detailed))

type: bool default: false

--trace_mutator_utilization (print mutator utilization, allocation speed, gc speed)

type: bool default: false

--weak_embedded_maps_in_optimized_code (make maps embedded in optimized code weak)

type: bool default: true

--weak_embedded_objects_in_optimized_code (make objects embedded in optimized code weak)

type: bool default: true

--flush_code (flush code that we expect not to use again)

type: bool default: true

--trace_code_flushing (trace code flushing progress)

type: bool default: false

--age_code (track un-executed functions to age code and flush only old code (required for code flushing))

type: bool default: true

--incremental_marking (use incremental marking)

type: bool default: true

--overapproximate_weak_closure (overapproximate weak closer to reduce atomic pause time)

type: bool default: true

--min_progress_during_object_groups_marking (keep overapproximating the weak closure as long as we discover at least this many unmarked objects)

type: int default: 128

--max_object_groups_marking_rounds (at most try this many times to over approximate the weak closure)

type: int default: 3

--concurrent_sweeping (use concurrent sweeping)

type: bool default: true

--trace_incremental_marking (trace progress of the incremental marking)

type: bool default: false

--track_gc_object_stats (track object counts and memory usage)

type: bool default: false

--trace_gc_object_stats (trace object counts and memory usage)

type: bool default: false

--track_detached_contexts (track native contexts that are expected to be garbage collected)

type: bool default: true

--trace_detached_contexts (trace native contexts that are expected to be garbage collected)

type: bool default: false

--histogram_interval (time interval in ms for aggregating memory histograms)

type: int default: 600000

--heap_profiler_trace_objects (Dump heap object allocations/movements/size_updates)

type: bool default: false

--use_idle_notification (Use idle notification to reduce memory footprint.)

type: bool default: true

--use_ic (use inline caching)

type: bool default: true

--trace_ic (trace inline cache state transitions)

type: bool default: false

--vector_stores (use vectors for store ics)

type: bool default: false

--global_var_shortcuts (use ic-less global loads and stores)

type: bool default: false

--native_code_counters (generate extra code for manipulating stats counters)

type: bool default: false

--always_compact (Perform compaction on every full GC)

type: bool default: false

--never_compact (Never perform compaction on full GC - testing only)

type: bool default: false

--compact_code_space (Compact code space on full collections)

type: bool default: true

--cleanup_code_caches_at_gc (Flush inline caches prior to mark compact collection and flush code caches in maps during mark compact cycle.)

type: bool default: true

--use_marking_progress_bar (Use a progress bar to scan large objects in increments when incremental marking is active.)

type: bool default: true

--zap_code_space (Zap free memory in code space with 0xCC while sweeping.)

type: bool default: false

--random_seed (Default seed for initializing random generator (0, the default, means to use system random).)

type: int default: 0

--trace_weak_arrays (Trace WeakFixedArray usage)

type: bool default: false

--track_prototype_users (Keep track of which maps refer to a given prototype object)

type: bool default: false

--trace_prototype_users (Trace updates to prototype user tracking)

type: bool default: false

--eliminate_prototype_chain_checks (Collapse prototype chain checks into single-cell checks)

type: bool default: true

--use_verbose_printer (allows verbose printing)

type: bool default: true

--allow_natives_syntax (allow natives syntax)

type: bool default: false

--trace_parse (trace parsing and preparsing)

type: bool default: false

--trace_sim (Trace simulator execution)

type: bool default: false

--debug_sim (Enable debugging the simulator)

type: bool default: false

--check_icache (Check icache flushes in ARM and MIPS simulator)

type: bool default: false

--stop_sim_at (Simulator stop after x number of instructions)

type: int default: 0

--sim_stack_alignment (Stack alingment in bytes in simulator (4 or 8, 8 is default))

type: int default: 8

--sim_stack_size (Stack size of the ARM64, MIPS64 and PPC64 simulator in kBytes (default is 2 MB))

type: int default: 2048

--log_regs_modified (When logging register values, only print modified registers.)

type: bool default: true

--log_colour (When logging, try to use coloured output.)

type: bool default: true

--ignore_asm_unimplemented_break (Don't break for ASM_UNIMPLEMENTED_BREAK macros.)

type: bool default: false

--trace_sim_messages (Trace simulator debug messages. Implied by --trace-sim.)

type: bool default: false

--stack_trace_on_illegal (print stack trace when an illegal exception is thrown)

type: bool default: false

--abort_on_uncaught_exception (abort program (dump core) when an uncaught exception is thrown)

type: bool default: false

--randomize_hashes (randomize hashes to avoid predictable hash collisions (with snapshots this option cannot override the baked-in seed))

type: bool default: true

--hash_seed (Fixed seed to use to hash property keys (0 means random)(with snapshots this option cannot override the baked-in seed))

type: int default: 0

--profile_deserialization (Print the time it takes to deserialize the snapshot.)

type: bool default: false

--serialization_statistics (Collect statistics on serialized objects.)

type: bool default: false

--regexp_optimization (generate optimized regexp code)

type: bool default: true

--testing_bool_flag (testing_bool_flag)

type: bool default: true

--testing_maybe_bool_flag (testing_maybe_bool_flag)

type: maybe_bool default: unset

--testing_int_flag (testing_int_flag)

type: int default: 13

--testing_float_flag (float-flag)

type: float default: 2.5

--testing_string_flag (string-flag)

type: string default: Hello, world!

--testing_prng_seed (Seed used for threading test randomness)

type: int default: 42

--testing_serialization_file (file in which to serialize heap)

type: string default: /tmp/serdes

--startup_blob (Write V8 startup blob file. (mksnapshot only))

type: string default: NULL

--profile_hydrogen_code_stub_compilation (Print the time it takes to lazily compile hydrogen code stubs.)

type: bool default: false

--predictable (enable predictable mode)

type: bool default: false

--force_marking_deque_overflows (force overflows of marking deque by reducing it's size to 64 words)

type: bool default: false

--stress_compaction (stress the GC compactor to flush out bugs (implies --force_marking_deque_overflows))

type: bool default: false

--manual_evacuation_candidates_selection (Test mode only flag. It allows an unit test to select evacuation candidates pages (requires --stress_compaction).)

type: bool default: false

--external_allocation_limit_incremental_time (Time spent in incremental marking steps (in ms) once the external allocation limit is reached)

type: int default: 1

--help (Print usage message, including flags, on console)

type: bool default: true

--dump_counters (Dump counters on exit)

type: bool default: false

--map_counters (Map counters to a file)

type: string default:

--js_arguments (Pass all remaining arguments to the script. Alias for "--".)

type: arguments default:

--log (Minimal logging (no API, code, GC, suspect, or handles samples).)

type: bool default: false

--log_all (Log all events to the log file.)

type: bool default: false

--log_api (Log API events to the log file.)

type: bool default: false

--log_code (Log code events to the log file without profiling.)

type: bool default: false

--log_gc (Log heap samples on garbage collection for the hp2ps tool.)

type: bool default: false

--log_handles (Log global handle events.)

type: bool default: false

--log_snapshot_positions (log positions of (de)serialized objects in the snapshot.)

type: bool default: false

--log_suspect (Log suspect operations.)

type: bool default: false

--prof (Log statistical profiling information (implies --log-code).)

type: bool default: false

--prof_cpp (Like --prof, but ignore generated code.)

type: bool default: false

--prof_browser_mode (Used with --prof, turns on browser-compatible mode for profiling.)

type: bool default: true

--log_regexp (Log regular expression execution.)

type: bool default: false

--logfile (Specify the name of the log file.)

type: string default: v8.log

--logfile_per_isolate (Separate log files for each isolate.)

type: bool default: true

--ll_prof (Enable low-level linux profiler.)

type: bool default: false

--perf_basic_prof (Enable perf linux profiler (basic support).)

type: bool default: false

--perf_basic_prof_only_functions (Only report function code ranges to perf (i.e. no stubs).)

type: bool default: false

--gc_fake_mmap (Specify the name of the file for fake gc mmap used in ll_prof)

type: string default: /tmp/__v8_gc__

--log_internal_timer_events (Time internal events.)

type: bool default: false

--log_timer_events (Time events including external callbacks.)

type: bool default: false

--log_instruction_stats (Log AArch64 instruction statistics.)

type: bool default: false

--log_instruction_file (AArch64 instruction statistics log file.)

type: string default: arm64_inst.csv

--log_instruction_period (AArch64 instruction statistics logging period.)

type: int default: 4194304

--redirect_code_traces (output deopt information and disassembly into file code-<pid>-<isolate id>.asm)

type: bool default: false

--redirect_code_traces_to (output deopt information and disassembly into the given file)

type: string default: NULL

--hydrogen_track_positions (track source code positions when building IR)

type: bool default: false

--trace_elements_transitions (trace elements transitions)

type: bool default: false

--trace_creation_allocation_sites (trace the creation of allocation sites)

type: bool default: false

--print_code_stubs (print code stubs)

type: bool default: false

--test_secondary_stub_cache (test secondary stub cache by disabling the primary one)

type: bool default: false

--test_primary_stub_cache (test primary stub cache by disabling the secondary one)

type: bool default: false

--print_code (print generated code)

type: bool default: false

--print_opt_code (print optimized code)

type: bool default: false

--print_unopt_code (print unoptimized code before printing optimized code based on it)

type: bool default: false

--print_code_verbose (print more information for code)

type: bool default: false

--print_builtin_code (print generated code for builtins)

type: bool default: false

--sodium (print generated code output suitable for use with the Sodium code viewer)

type: bool default: false

--print_all_code (enable all flags related to printing code)

type: bool default: false

See the website for documentation https://nodejs.org/

Mailing list: http://groups.google.com/group/nodejs

IRC (general questions): irc.freenode.net #node.js

IRC (node core development): irc.freenode.net #node-dev